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  • Is version history really sacred or is it better to rebase?

    - by dukeofgaming
    I've always agreed with Mercurial's mantra, however, now that Mercurial comes bundled with the rebase extension and it is a popular practice in git, I'm wondering if it could really be regarded as a "bad practice", or at least bad enough to avoid using. In any case, I'm aware of rebasing being dangerous after pushing. OTOH, I see the point of trying to package 5 commits in a single one to make it look niftier (specially at in a production branch), however, personally I think would be better to be able to see partial commits to a feature where some experimentation is done, even if it is not as nifty, but seeing something like "Tried to do it way X but it is not as optimal as Y after all, doing it Z taking Y as base" would IMHO have good value to those studying the codebase and follow the developers train of thought. My very opinionated (as in dumb, visceral, biased) point of view is that programmers like rebase to hide mistakes... and I don't think this is good for the project at all. So my question is: have you really found valuable to have such "organic commits" (i.e. untampered history) in practice?, or conversely, do you prefer to run into nifty well-packed commits and disregard the programmers' experimentation process?; whichever one you chose, why does that work for you? (having other team members to keep history, or alternatively, rebasing it).

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  • Oracle Buys BigMachines - Adds Leading Configure, Price and Quote (CPQ) Cloud to the Oracle Cloud to Enable Smarter Selling

    - by Richard Lefebvre
    News Facts Oracle today announced that it has entered into an agreement to acquire BigMachines, a leading cloud-based Configure, Price and Quote (CPQ) solution provider. BigMachines’ CPQ Cloud accelerates the conversion of sales opportunities into revenue by automating the sales order process with guided selling, dynamic pricing, and an easy-to-use workflow approval process, accessible anywhere, on any device. Companies that use sales automation technology often rely on manual, cumbersome and disconnected processes to convert opportunities into orders. This creates errors, adds costs, delays revenue, and degrades the customer experience. BigMachines’ CPQ cloud extends sales automation to include the creation of an optimal quote, which enables sales personnel to easily configure and price complex products, select the best options, promotions and deal terms, and include up sell and renewals, all using automated workflows. In combination with Oracle’s enterprise-grade cloud solutions, including Marketing, Sales, Social, Commerce and Service Clouds, Oracle and BigMachines will create an end-to-end smarter selling cloud solution so sales personnel are more productive, customers are more satisfied, and companies grow revenue faster. More information on this announcement can be found at http://www.oracle.com/bigmachines Supporting Quotes “The fundamental goals of smarter selling are to provide sales teams with the information, access, and insights they need to maximize revenue opportunities and execute on all phases of the sales cycle,” said Thomas Kurian, Executive Vice President, Oracle Development. “By adding BigMachines’ CPQ Cloud to the Oracle Cloud, companies will be able to drive more revenue and increase customer satisfaction with a seamlessly integrated process across marketing and sales, pricing and quoting, and fulfillment and service.” “BigMachines has developed leading CPQ solutions that serve companies of all sizes across multiple industries,” said David Bonnette, BigMachines’ CEO. “Together with Oracle, we expect to provide a complete cloud solution to manage sales processes and deliver exceptional customer experiences.” Supporting Resources About Oracle and BigMachines General Presentation Customer and Partner Letter FAQ

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  • MongoDB: Replicate data in documents vs. “join”

    - by JavierCane
    Disclaimer: This is a question derived from this one. What do you think about the following example of use case? I have a table containing orders. These orders has a lot of related information needed by my current queries (think about the products; the buyer information; the region, country and state of the sale point; and so on) In order to think with a de-normalized approach, I don't have to put identifiers of these related items in my main orders collection. Instead, I have to repeat all the information for each order (ie: I will repeat the buyer's name, surname, etc. for each of its orders). Assuming the previous premise, I'm committing to maintain all the data related to an order without a lot of updates (because if I modify the buyer's name, I'll have to iterate through all orders updating the ones made by the same buyer, and as MongoDB blocks at a document level on updates, I would be blocking the entire order at the update moment). I'll have to replicate all the products' related data? (ie: category, maker and optional attributes like color, size…) What if a new feature is requested and I've to make a lot of queries with the products "as the entry point of the query"? (ie: reports showing the products' sales performance grouping by region, country, or whatever) Is it fair enough to apply the $unwind operation to my orders original collection? (What about the performance?) I should have to do another collection with these queries in mind and replicate again all the products' information (and their orders)? Wouldn't be better to store a product_id in the original orders collection in order to be more tolerable to requirements change? (What about emulating JOINs?) The optimal approach would be a mixed solution with a RDBMS system like MySQL in order to retrieve the complete data? I mean: store products, users, and location identifiers in the orders collection and have queries in MySQL like getAllUsersDataByIds in which I would perform a SELECT * FROM users WHERE user_id IN ( :identifiers_retrieved_from_the_mongodb_query )

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  • NFS users getting a laggy GUI expierence

    - by elzilrac
    I am setting up a system (ubuntu 12.04) that uses ldap, pam, and autofs to load users and their home folders from a remote server. One of the options for login is sitting down at the machine and starting a GUI session. Programs such as chormium (browser) that preform many read/write operations in the ~/.cache and ~/.config files are slowing down the GUI experience as well as putting strain of the NFS server that is causing other users to have problems. Ubuntu had the handy-dandy XDG_CONFIG_HOME and XDG_CACHE_HOME variables that can be set to change the default location of .cache and .config from the home folder to somewhere else. There are several places to set them, but most of them are not optimal. /etc/environment pros: will work across all shells cons: cannot use variables like $USER so that you can't make users have different new locations for .cache and .config. Every users' new location would be the same directory. /etc/bash.bashrc pros: $USER works, so you can place them in different folders cons: only gets run for bash compatible shells ~/.pam_environment pros: works regardless of shell cons: cannot use system variables (like $USER), has it's own syntax, and has to be created for every user

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  • How to mount drive in /media/userName/ like nautilus do using udisks

    - by Bsienn
    As of my current installation of Ubuntu 13.10 Unity, when i click on a drive in nautilus it get mounted in /media/username/mountedDrive i read that nautilus use udisks to do that. Basically i want to auto mount my drive using udisks in start up using this method But problem is, it mounts the drive in /media/mountedDrive, but i want it the way nautilus do in /media/username/mounteDrive I want NTFS Data drive to be auto mounted at /media/bsienn/ bsienn@bsienn-desktop:~$ blkid /dev/sda1: LABEL="System Reserved" UUID="8230744030743D6B" TYPE="ntfs" /dev/sda2: LABEL="Windows 7" UUID="60100EA5100E81F0" TYPE="ntfs" /dev/sda3: LABEL="Data" UUID="882C04092C03F14C" TYPE="ntfs" /dev/sda5: UUID="8768800f-59e1-41a2-9092-c0a8cb60dabf" TYPE="swap" /dev/sda6: LABEL="Ubuntu Drive" UUID="13ea474a-fb27-4c91-bae7-c45690f88954" TYPE="ext4" /dev/sda7: UUID="69c22e73-9f64-4b48-b854-7b121642cd5d" TYPE="ext4" bsienn@bsienn-desktop:~$ sudo fdisk -l Disk /dev/sda: 160.0 GB, 160000000000 bytes 255 heads, 63 sectors/track, 19452 cylinders, total 312500000 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x8d528d52 Device Boot Start End Blocks Id System /dev/sda1 * 2048 206847 102400 7 HPFS/NTFS/exFAT /dev/sda2 206848 117730069 58761611 7 HPFS/NTFS/exFAT /dev/sda3 158690072 312494116 76902022+ 7 HPFS/NTFS/exFAT /dev/sda4 117731326 158689279 20478977 5 Extended /dev/sda5 137263104 141260799 1998848 82 Linux swap / Solaris /dev/sda6 141262848 158689279 8713216 83 Linux /dev/sda7 117731328 137263103 9765888 83 Linux Partition table entries are not in disk order bsienn@bsienn-desktop:~$ cat /etc/fstab # /etc/fstab: static file system information. # # Use 'blkid' to print the universally unique identifier for a # device; this may be used with UUID= as a more robust way to name devices # that works even if disks are added and removed. See fstab(5). # # <file system> <mount point> <type> <options> <dump> <pass> # / was on /dev/sda7 during installation UUID=69c22e73-9f64-4b48-b854-7b121642cd5d / ext4 errors=remount-ro 0 1 # swap was on /dev/sda5 during installation UUID=8768800f-59e1-41a2-9092-c0a8cb60dabf none swap sw 0 0 Desired effect: Picture link

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  • Partitions mixing up

    - by anon
    I am trying to install ubuntu alongside my windows 7. The problem is that ubuntu is not detecting all of my partitions and basically clubs together many of them. The same thing is done by using GParted. However this problem does not arise while I am using Windows - 7. I cant paste the image of GParted since I dont have the required reputation... I think this could be due to stray GPT data but am not sure how to take care of it. Can someone help me figure this out ? The output of fdisk -l is as follows Disk /dev/sda: 320.1 GB, 320072933376 bytes 255 heads, 63 sectors/track, 38913 cylinders, total 625142448 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x20000000 Device Boot Start End Blocks Id System /dev/sda1 63 2047 992+ 42 SFS /dev/sda2 * 2048 206847 102400 42 SFS /dev/sda3 206848 146802687 73297920 42 SFS /dev/sda4 146802688 625140399 239168856 42 SFS However actually I have 4 partitions along with 25 gb unallocated space that I had thought to use for Ubuntu installation.

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  • How to build a "traffic AI"?

    - by Lunikon
    A project I am working on right now features a lot of "traffic" in the sense of cars moving along roads, aircraft moving aroun an apron etc. As of now the available paths are precalculated, so nodes are generated automatically for crossings which themselves are interconnected by edges. When a character/agent spawns into the world it starts at some node and finds a path to a target node by means of a simply A* algorithm. The agent follows the path and ultimately reaches its destination. No problem so far. Now I need to enable the agents to avoid collisions and to handle complex traffic situations. Since I'm new to the field of AI I looked up several papers/articles on steering behavior but found them to be too low-level. My problem consists less of the actual collision avoidance (which is rather simple in this case because the agents follow strictly defined paths) but of situations like one agent leaving a dead-end while another one wants to enter exactly the same one. Or two agents meeting at a bottleneck which only allows one agent to pass at a time but both need to pass it (according to the optimal route found before) and they need to find a way to let the other one pass first. So basically the main aspect of the problem would be predicting traffic movement to avoid dead-locks. Difficult to describe, but I guess you get what I mean. Do you have any recommendations for me on where to start looking? Any papers, sample projects or similar things that could get me started? I appreciate your help!

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  • Black Screen after installing recommended Nvidia drivers. What to do?

    - by former_Windows_user
    New to Ubuntu. Problem description: Until recently I had Windows on my computer. My hard disk is divided into two partitions. On the first one (app. 10 GB) I had my Windows XP On the second one (app. 30 GB) I have some data I tried to install Ubuntu 12.04 on the first partition (the smaller one). Since I wanted to keep the data on my second partition, I chose the third install option. During the installation process I deleted the data on partition one, created a new partition with the same size, formatted it as ext4 and mounted / on it. The installation continued fine and at the end I restarted and took the CD out when it ejected automatically (it could have been also before the restart). Ubuntu started but I noticed that my computer was slow. Then a prompt appeared telling me that I did not have the optimal NVidia drivers and recommended to install a specific one. I clicked on the recommended driver, installation went apparently just fine and at the end I had to restart the system again. I did it, Ubuntu started, asked for my password, I typed it, pressed Enter, the screen turned black and remained like that (only the cursor was there and I could move it). I restarted and the same thing happened again. Has anyone had such a problem before and was able to solve it? With Windows I always installed drivers from CDs after installing Windows. Are the same CDs going to work for Ubuntu too or I should find special drivers? P.S. During the installation I was connected to the internet and I agreed on installing updates and the third party software. In the time before I installed that problematic but recommended NVidia driver I checked that there was between 6 and 7 GB free space on the first partition where I installed Ubuntu.

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  • Unable to mount location ubuntu 12.10

    - by Rajesh
    I'm new to Ubuntu. I installed Ubuntu 12.10 replacing windows. Now I'm getting Unable to mount location error while opening the drive. $ cat /etc/fstab # /etc/fstab: static file system information. # # Use 'blkid' to print the universally unique identifier for a # device; this may be used with UUID= as a more robust way to name devices # that works even if disks are added and removed. See fstab(5). # # <file system> <mount point> <type> <options> <dump> <pass> # / was on /dev/sda1 during installation UUID=5fa63194-c19e-4117-95c6-679eb6453d3b / ext4 errors=remount-ro 0 1 # swap was on /dev/sda5 during installation UUID=70f1ec8d-aa45-4de7-a206-747dccd2472b none swap sw 0 0 $ sudo fdisk -l Disk /dev/sda: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0001f10f Device Boot Start End Blocks Id System /dev/sda1 * 2048 970561535 485279744 83 Linux /dev/sda2 970563582 976771071 3103745 5 Extended /dev/sda5 970563584 976771071 3103744 82 Linux swap / Solaris

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  • "Do it right, against customer's wishes" - how is it called?

    - by SF.
    We know the optimal situation of negotiating corrections of specifications with the customer, getting the specs to do what the client wanted, not what they said or thought they wanted. That's negotiating, explaining. Sometimes, we're unable to convince the client. We're forced to produce broken as designed. This, called "demonology" by merit of mages summoning demons and demons fulfilling their wishes very literally, causing the mage's demise as result, is another approach that will leave the customer very dissatisfied once they realize their error, and of course try to pin the blame on the developer. Now I just faced a very different approach: the customer created simple specs that fail to account for some critical caveat, and is completely unwilling to fix them, admit the obvious errors and accept suggested corrections. The product made to these specs will be critically broken, and possibly might cost human lives. Still, it's too late to drop the contract entirely. The contract has punitive clauses for that, ones we can't really accept. The boss' decision? We do the work right and lie to the customer that we did it according to the specs. The algorithms in question are hidden deep enough under the surface, the product will do the work just fine, won't fail in the caveat situation, and unless someone digs too deep, they will never discover we didn't break it as requested. Is there some common name for this tactics of execution of specs?

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  • How to get the level and position of the player from an extern program? [on hold]

    - by user3727174
    I want to write a program that needs the current level and position of the player (primary single player). This should work for potentially every game installed and running on the computer my program is running on. The data I need is basically one integer value for the level (if there are any) and three integer values for x, y and optimal z for the position of the player. In which relation/scale or where the null point is does not matter, because this information is going to be interpreted game dependent, I will use this information to read information out of a database created for the game currently running. Currently I'm using C++, but if there is a better option for Java I´m willing to port my program. My thoughs so far are: make a mod for every game that should be supported, get the position/level from there, write this information to the disk and read it from my program tracking mouse/keyboard events and reconstructing the movement won't work Are there any general APIs for something like this? Any Tool to find this data? Or maybe engines that provide APIs to get this data directly from the game?

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  • Dual booting on separate hard drives

    - by tornadorider
    I have windows XP professional installed on 1 hard drive and Ubuntu 10.10 on my second hard drive. On start up the computer completely skips the grub menu and boots straight into 10.10. I have tried running os-prober with the windows hard drive mounted and then updating grub but it didnt work. Any ideas? I have changed the boot order so that the HDD with xp on it is first however the computer still booted into linux. I tried running grub-install /dev/sda and got this /usr/sbin/grub-setup: warn: Sector 32 is already in use by FlexNet; avoiding it. This software may cause boot or other problems in future. Please ask its authors not to store data in the boot track.. /usr/sbin/grub-setup: warn: Sector 33 is already in use by FlexNet; avoiding it. This software may cause boot or other problems in future. Please ask its authors not to store data in the boot track.. Installation finished. No error reported I checked using disk utility and the code for my xp hard drive is sdb so i ran the camand grub-install /dev/sdb shich gave me this Installation finished. No error reported. So i rebooted but it still didnt work. Any other ideas? Additional info gedit /boot/grub/grub.cfg: # # DO NOT EDIT THIS FILE # # It is automatically generated by grub-mkconfig using templates # from /etc/grub.d and settings from /etc/default/grub # ### BEGIN /etc/grub.d/00_header ### if [ -s $prefix/grubenv ]; then set have_grubenv=true load_env fi set default="0" if [ "${prev_saved_entry}" ]; then set saved_entry="${prev_saved_entry}" save_env saved_entry set prev_saved_entry= save_env prev_saved_entry set boot_once=true fi function savedefault { if [ -z "${boot_once}" ]; then saved_entry="${chosen}" save_env saved_entry fi } function recordfail { set recordfail=1 if [ -n "${have_grubenv}" ]; then if [ -z "${boot_once}" ]; then save_env recordfail; fi; fi } function load_video { insmod vbe insmod vga } insmod part_msdos insmod ext2 set root='(hd0,msdos1)' search --no-floppy --fs-uuid --set d682c9bd-dd89-4827-9802-a1f921ebe21c if loadfont /usr/share/grub/unicode.pf2 ; then set gfxmode=640x480 load_video insmod gfxterm fi terminal_output gfxterm insmod part_msdos insmod ext2 set root='(hd0,msdos1)' search --no-floppy --fs-uuid --set d682c9bd-dd89-4827-9802-a1f921ebe21c set locale_dir=($root)/boot/grub/locale set lang=en insmod gettext if [ "${recordfail}" = 1 ]; then set timeout=-1 else set timeout=10 fi ### END /etc/grub.d/00_header ### ### BEGIN /etc/grub.d/05_debian_theme ### set menu_color_normal=white/black set menu_color_highlight=black/light-gray ### END /etc/grub.d/05_debian_theme ### ### BEGIN /etc/grub.d/10_linux ### menuentry 'Ubuntu, with Linux 2.6.35-28-generic' --class ubuntu --class gnu-linux --class gnu --class os { recordfail insmod part_msdos insmod ext2 set root='(hd0,msdos1)' search --no-floppy --fs-uuid --set d682c9bd-dd89-4827-9802-a1f921ebe21c linux /boot/vmlinuz-2.6.35-28-generic root=UUID=d682c9bd-dd89-4827-9802-a1f921ebe21c ro quiet splash initrd /boot/initrd.img-2.6.35-28-generic } menuentry 'Ubuntu, with Linux 2.6.35-28-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os { recordfail insmod part_msdos insmod ext2 set root='(hd0,msdos1)' search --no-floppy --fs-uuid --set d682c9bd-dd89-4827-9802-a1f921ebe21c echo 'Loading Linux 2.6.35-28-generic ...' linux /boot/vmlinuz-2.6.35-28-generic root=UUID=d682c9bd-dd89-4827-9802-a1f921ebe21c ro single echo 'Loading initial ramdisk ...' initrd /boot/initrd.img-2.6.35-28-generic } menuentry 'Ubuntu, with Linux 2.6.35-22-generic' --class ubuntu --class gnu-linux --class gnu --class os { recordfail insmod part_msdos insmod ext2 set root='(hd0,msdos1)' search --no-floppy --fs-uuid --set d682c9bd-dd89-4827-9802-a1f921ebe21c linux /boot/vmlinuz-2.6.35-22-generic root=UUID=d682c9bd-dd89-4827-9802-a1f921ebe21c ro quiet splash initrd /boot/initrd.img-2.6.35-22-generic } menuentry 'Ubuntu, with Linux 2.6.35-22-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os { recordfail insmod part_msdos insmod ext2 set root='(hd0,msdos1)' search --no-floppy --fs-uuid --set d682c9bd-dd89-4827-9802-a1f921ebe21c echo 'Loading Linux 2.6.35-22-generic ...' linux /boot/vmlinuz-2.6.35-22-generic root=UUID=d682c9bd-dd89-4827-9802-a1f921ebe21c ro single echo 'Loading initial ramdisk ...' initrd /boot/initrd.img-2.6.35-22-generic } ### END /etc/grub.d/10_linux ### ### BEGIN /etc/grub.d/20_linux_xen ### ### END /etc/grub.d/20_linux_xen ### ### BEGIN /etc/grub.d/20_memtest86+ ### menuentry "Memory test (memtest86+)" { insmod part_msdos insmod ext2 set root='(hd0,msdos1)' search --no-floppy --fs-uuid --set d682c9bd-dd89-4827-9802-a1f921ebe21c linux16 /boot/memtest86+.bin } menuentry "Memory test (memtest86+, serial console 115200)" { insmod part_msdos insmod ext2 set root='(hd0,msdos1)' search --no-floppy --fs-uuid --set d682c9bd-dd89-4827-9802-a1f921ebe21c linux16 /boot/memtest86+.bin console=ttyS0,115200n8 } ### END /etc/grub.d/20_memtest86+ ### ### BEGIN /etc/grub.d/30_os-prober ### if [ "x${timeout}" != "x-1" ]; then if keystatus; then if keystatus --shift; then set timeout=-1 else set timeout=0 fi else if sleep --interruptible 3 ; then set timeout=0 fi fi fi ### END /etc/grub.d/30_os-prober ### ### BEGIN /etc/grub.d/40_custom ### # This file provides an easy way to add custom menu entries. Simply type the # menu entries you want to add after this comment. Be careful not to change # the 'exec tail' line above. ### END /etc/grub.d/40_custom ### ### BEGIN /etc/grub.d/41_custom ### if [ -f $prefix/custom.cfg ]; then source $prefix/custom.cfg; fi ### END /etc/grub.d/41_custom ### sudo fdisk -l: Disk /dev/sda: 80.1 GB, 80060424192 bytes 255 heads, 63 sectors/track, 9733 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0008a483 Device Boot Start End Blocks Id System /dev/sda1 * 1 9352 75112448 83 Linux /dev/sda2 9352 9734 3068929 5 Extended /dev/sda5 9352 9734 3068928 82 Linux swap / Solaris Disk /dev/sdb: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xc5d6c5d6 Device Boot Start End Blocks Id System /dev/sdb1 1 60800 488375968+ 7 HPFS/NTFS sudo blkid /dev/sda1: UUID="d682c9bd-dd89-4827-9802-a1f921ebe21c" TYPE="ext4" /dev/sda5: UUID="09e9c2cb-d903-4f0b-a181-536951845231" TYPE="swap" /dev/sdb1: UUID="B21844EB1844AFE1" TYPE="ntfs" sudo os-prober (nothing) Boot Info Script 0.55 dated February 15th, 2010 ============================= Boot Info Summary: ============================== => Grub 2 is installed in the MBR of /dev/sda and looks on the same drive in partition #1 for (,msdos1)/boot/grub. => Grub 2 is installed in the MBR of /dev/sdb and looks on the same drive in partition #1 for (,msdos1)/boot/grub. sda1: _________________________________________________________________________ File system: ext4 Boot sector type: - Boot sector info: Operating System: Ubuntu 10.10 Boot files/dirs: /boot/grub/grub.cfg /etc/fstab /boot/grub/core.img sda2: _________________________________________________________________________ File system: Extended Partition Boot sector type: Unknown Boot sector info: sda5: _________________________________________________________________________ File system: swap Boot sector type: - Boot sector info: sdb1: _________________________________________________________________________ File system: ntfs Boot sector type: Windows XP Boot sector info: No errors found in the Boot Parameter Block. Operating System: Windows XP Boot files/dirs: =========================== Drive/Partition Info: ============================= Drive: sda ___________________ _____________________________________________________ Disk /dev/sda: 80.1 GB, 80060424192 bytes 255 heads, 63 sectors/track, 9733 cylinders, total 156368016 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes Partition Boot Start End Size Id System /dev/sda1 * 2,048 150,226,943 150,224,896 83 Linux /dev/sda2 150,228,990 156,366,847 6,137,858 5 Extended /dev/sda5 150,228,992 156,366,847 6,137,856 82 Linux swap / Solaris Drive: sdb ___________________ _____________________________________________________ Disk /dev/sdb: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes Partition Boot Start End Size Id System /dev/sdb1 * 63 976,751,999 976,751,937 7 HPFS/NTFS blkid -c /dev/null: ____________________________________________________________ Device UUID TYPE LABEL /dev/sda1 d682c9bd-dd89-4827-9802-a1f921ebe21c ext4 /dev/sda2: PTTYPE="dos" /dev/sda5 09e9c2cb-d903-4f0b-a181-536951845231 swap /dev/sda: PTTYPE="dos" /dev/sdb1 B21844EB1844AFE1 ntfs /dev/sdb: PTTYPE="dos" ============================ "mount | grep ^/dev output: =========================== Device Mount_Point Type Options /dev/sda1 / ext4 (rw,errors=remount-ro,commit=0) =========================== sda1/boot/grub/grub.cfg: =========================== # # DO NOT EDIT THIS FILE # # It is automatically generated by grub-mkconfig using templates # from /etc/grub.d and settings from /etc/default/grub # ### BEGIN /etc/grub.d/00_header ### if [ -s $prefix/grubenv ]; then set have_grubenv=true load_env fi set default="0" if [ "${prev_saved_entry}" ]; then set saved_entry="${prev_saved_entry}" save_env saved_entry set prev_saved_entry= save_env prev_saved_entry set boot_once=true fi function savedefault { if [ -z "${boot_once}" ]; then saved_entry="${chosen}" save_env saved_entry fi } function recordfail { set recordfail=1 if [ -n "${have_grubenv}" ]; then if [ -z "${boot_once}" ]; then save_env recordfail; fi; fi } function load_video { insmod vbe insmod vga } insmod part_msdos insmod ext2 set root='(hd0,msdos1)' search --no-floppy --fs-uuid --set d682c9bd-dd89-4827-9802-a1f921ebe21c if loadfont /usr/share/grub/unicode.pf2 ; then set gfxmode=640x480 load_video insmod gfxterm fi terminal_output gfxterm insmod part_msdos insmod ext2 set root='(hd0,msdos1)' search --no-floppy --fs-uuid --set d682c9bd-dd89-4827-9802-a1f921ebe21c set locale_dir=($root)/boot/grub/locale set lang=en insmod gettext if [ "${recordfail}" = 1 ]; then set timeout=-1 else set timeout=10 fi ### END /etc/grub.d/00_header ### ### BEGIN /etc/grub.d/05_debian_theme ### set menu_color_normal=white/black set menu_color_highlight=black/light-gray ### END /etc/grub.d/05_debian_theme ### ### BEGIN /etc/grub.d/10_linux ### menuentry 'Ubuntu, with Linux 2.6.35-28-generic' --class ubuntu --class gnu-linux --class gnu --class os { recordfail insmod part_msdos insmod ext2 set root='(hd0,msdos1)' search --no-floppy --fs-uuid --set d682c9bd-dd89-4827-9802-a1f921ebe21c linux /boot/vmlinuz-2.6.35-28-generic root=UUID=d682c9bd-dd89-4827-9802-a1f921ebe21c ro quiet splash initrd /boot/initrd.img-2.6.35-28-generic } menuentry 'Ubuntu, with Linux 2.6.35-28-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os { recordfail insmod part_msdos insmod ext2 set root='(hd0,msdos1)' search --no-floppy --fs-uuid --set d682c9bd-dd89-4827-9802-a1f921ebe21c echo 'Loading Linux 2.6.35-28-generic ...' linux /boot/vmlinuz-2.6.35-28-generic root=UUID=d682c9bd-dd89-4827-9802-a1f921ebe21c ro single echo 'Loading initial ramdisk ...' initrd /boot/initrd.img-2.6.35-28-generic } menuentry 'Ubuntu, with Linux 2.6.35-22-generic' --class ubuntu --class gnu-linux --class gnu --class os { recordfail insmod part_msdos insmod ext2 set root='(hd0,msdos1)' search --no-floppy --fs-uuid --set d682c9bd-dd89-4827-9802-a1f921ebe21c linux /boot/vmlinuz-2.6.35-22-generic root=UUID=d682c9bd-dd89-4827-9802-a1f921ebe21c ro quiet splash initrd /boot/initrd.img-2.6.35-22-generic } menuentry 'Ubuntu, with Linux 2.6.35-22-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os { recordfail insmod part_msdos insmod ext2 set root='(hd0,msdos1)' search --no-floppy --fs-uuid --set d682c9bd-dd89-4827-9802-a1f921ebe21c echo 'Loading Linux 2.6.35-22-generic ...' linux /boot/vmlinuz-2.6.35-22-generic root=UUID=d682c9bd-dd89-4827-9802-a1f921ebe21c ro single echo 'Loading initial ramdisk ...' initrd /boot/initrd.img-2.6.35-22-generic } ### END /etc/grub.d/10_linux ### ### BEGIN /etc/grub.d/20_linux_xen ### ### END /etc/grub.d/20_linux_xen ### ### BEGIN /etc/grub.d/20_memtest86+ ### menuentry "Memory test (memtest86+)" { insmod part_msdos insmod ext2 set root='(hd0,msdos1)' search --no-floppy --fs-uuid --set d682c9bd-dd89-4827-9802-a1f921ebe21c linux16 /boot/memtest86+.bin } menuentry "Memory test (memtest86+, serial console 115200)" { insmod part_msdos insmod ext2 set root='(hd0,msdos1)' search --no-floppy --fs-uuid --set d682c9bd-dd89-4827-9802-a1f921ebe21c linux16 /boot/memtest86+.bin console=ttyS0,115200n8 } ### END /etc/grub.d/20_memtest86+ ### ### BEGIN /etc/grub.d/30_os-prober ### if [ "x${timeout}" != "x-1" ]; then if keystatus; then if keystatus --shift; then set timeout=-1 else set timeout=0 fi else if sleep --interruptible 3 ; then set timeout=0 fi fi fi ### END /etc/grub.d/30_os-prober ### ### BEGIN /etc/grub.d/40_custom ### # This file provides an easy way to add custom menu entries. Simply type the # menu entries you want to add after this comment. Be careful not to change # the 'exec tail' line above. menuentry "Windows XP" { set root=(hd1,1) chainloader (hd1,1)+1 } ### END /etc/grub.d/40_custom ### ### BEGIN /etc/grub.d/41_custom ### if [ -f $prefix/custom.cfg ]; then source $prefix/custom.cfg; fi ### END /etc/grub.d/41_custom ### =============================== sda1/etc/fstab: =============================== # /etc/fstab: static file system information. # # Use 'blkid -o value -s UUID' to print the universally unique identifier # for a device; this may be used with UUID= as a more robust way to name # devices that works even if disks are added and removed. See fstab(5). # # <file system> <mount point> <type> <options> <dump> <pass> proc /proc proc nodev,noexec,nosuid 0 0 /dev/sda1 / ext4 errors=remount-ro 0 1 # swap was on /dev/sda5 during installation UUID=09e9c2cb-d903-4f0b-a181-536951845231 none swap sw 0 0 =================== sda1: Location of files loaded by Grub: =================== 51.7GB: boot/grub/core.img 58.5GB: boot/grub/grub.cfg 1.2GB: boot/initrd.img-2.6.35-22-generic 1.3GB: boot/initrd.img-2.6.35-28-generic 58.2GB: boot/vmlinuz-2.6.35-22-generic 51.7GB: boot/vmlinuz-2.6.35-28-generic 1.3GB: initrd.img 1.2GB: initrd.img.old 51.7GB: vmlinuz 58.2GB: vmlinuz.old =========================== Unknown MBRs/Boot Sectors/etc ======================= Unknown BootLoader on sda2 00000000 d9 ed 13 ab ff a8 33 8c 01 b2 47 99 e1 4a b1 f1 |......3...G..J..| 00000010 69 5f a7 29 a4 1a 03 9e 31 b9 45 02 71 e6 58 78 |i_.)....1.E.q.Xx| 00000020 3d f6 ee 7b 3e 33 1b 82 c6 7d cf 1a c8 e7 bc 2f |=..{>3...}...../| 00000030 b9 e1 70 75 cf 18 aa e7 d5 7e 3c f1 b4 e7 9e 3a |..pu.....~<....:| 00000040 55 38 f1 b4 ee 78 59 0b 5e f7 3c 4c 57 73 9c 2a |U8...xY.^.<LWs.*| 00000050 28 f1 19 ed 11 9c b2 19 e2 80 92 1c 7b 84 ee 0b |(...........{...| 00000060 e2 c0 ac af 0a 50 42 b9 cf 0c dc 2c 20 77 85 dc |.....PB...., w..| 00000070 8f 70 5f 7b 84 9b a1 f7 8c 2d ee 70 5c ae f7 39 |.p_{.....-.p\..9| 00000080 63 f7 09 8a ec 79 4c ed 9f cc ad 3c f8 1b 47 7d |c....yL....<..G}| 00000090 3f 97 d5 16 cb 29 45 38 25 61 36 08 de 10 93 0f |?....)E8%a6.....| 000000a0 95 4f ea 54 f9 89 ff f1 bf 9a cc bb fd b6 22 b1 |.O.T..........".| 000000b0 65 08 05 21 78 19 46 b0 24 7e fb de d4 b3 ba d6 |e..!x.F.$~......| 000000c0 ec 11 65 82 ee 10 1d 12 04 91 da 6d 67 47 ea 9b |..e........mgG..| 000000d0 6f b0 aa fb cb 67 10 64 86 e8 26 85 fb f9 50 77 |o....g.d..&...Pw| 000000e0 9d 13 9b 9e d9 11 f3 a1 50 1b 11 b7 93 79 9f ab |........P....y..| 000000f0 c1 b6 86 0f 35 ed d4 9f dc f8 db bd ed 45 3a 68 |....5........E:h| 00000100 54 68 4a 1d d1 fc b8 c9 72 b4 d7 7b 60 e7 39 2f |ThJ.....r..{`.9/| 00000110 2a 0a 4e 52 72 52 c6 e2 2a 55 6a 2a e1 82 40 71 |*.NRrR..*Uj*..@q| 00000120 11 11 e0 53 d6 ff 1b a9 c6 65 df 1e b7 15 6f a2 |...S.....e....o.| 00000130 15 02 a4 6d 19 b7 78 57 a6 ee 9e 36 08 7d 6f 7c |...m..xW...6.}o|| 00000140 fd f7 7c d5 40 ff 0f c7 97 dc aa 00 ce 8b bb dc |..|.@...........| 00000150 e2 eb 1c 50 74 d8 14 cc 9a d6 5c a2 ab f2 67 f9 |...Pt.....\...g.| 00000160 58 ed 43 79 0e 78 7a 5c a6 f8 7b e8 05 4e 62 8a |X.Cy.xz\..{..Nb.| 00000170 0a 5f 22 ee a6 38 b9 e1 32 45 97 08 cc 75 66 c6 |._"..8..2E...uf.| 00000180 b3 a2 2d 89 a1 e9 95 21 28 53 fd dd be b1 b2 a2 |..-....!(S......| 00000190 78 3f a3 c9 3d e3 31 54 88 cf 78 0d e1 21 a8 74 |x?..=.1T..x..!.t| 000001a0 06 60 9d 21 c6 7a 24 e1 cc 28 f8 98 e0 99 e3 fc |.`.!.z$..(......| 000001b0 fa 8b eb d5 56 03 20 b8 54 ba c6 ee 9f 57 00 fe |....V. .T....W..| 000001c0 ff ff 82 fe ff ff 02 00 00 00 00 a8 5d 00 00 00 |............]...| 000001d0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| * 000001f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 55 aa |..............U.| 00000200

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  • Sharing Bandwidth and Prioritizing Realtime Traffic via HTB, Which Scenario Works Better?

    - by Mecki
    I would like to add some kind of traffic management to our Internet line. After reading a lot of documentation, I think HFSC is too complicated for me (I don't understand all the curves stuff, I'm afraid I will never get it right), CBQ is not recommend, and basically HTB is the way to go for most people. Our internal network has three "segments" and I'd like to share bandwidth more or less equally between those (at least in the beginning). Further I must prioritize traffic according to at least three kinds of traffic (realtime traffic, standard traffic, and bulk traffic). The bandwidth sharing is not as important as the fact that realtime traffic should always be treated as premium traffic whenever possible, but of course no other traffic class may starve either. The question is, what makes more sense and also guarantees better realtime throughput: Creating one class per segment, each having the same rate (priority doesn't matter for classes that are no leaves according to HTB developer) and each of these classes has three sub-classes (leaves) for the 3 priority levels (with different priorities and different rates). Having one class per priority level on top, each having a different rate (again priority won't matter) and each having 3 sub-classes, one per segment, whereas all 3 in the realtime class have highest prio, lowest prio in the bulk class, and so on. I'll try to make this more clear with the following ASCII art image: Case 1: root --+--> Segment A | +--> High Prio | +--> Normal Prio | +--> Low Prio | +--> Segment B | +--> High Prio | +--> Normal Prio | +--> Low Prio | +--> Segment C +--> High Prio +--> Normal Prio +--> Low Prio Case 2: root --+--> High Prio | +--> Segment A | +--> Segment B | +--> Segment C | +--> Normal Prio | +--> Segment A | +--> Segment B | +--> Segment C | +--> Low Prio +--> Segment A +--> Segment B +--> Segment C Case 1 Seems like the way most people would do it, but unless I don't read the HTB implementation details correctly, Case 2 may offer better prioritizing. The HTB manual says, that if a class has hit its rate, it may borrow from its parent and when borrowing, classes with higher priority always get bandwidth offered first. However, it also says that classes having bandwidth available on a lower tree-level are always preferred to those on a higher tree level, regardless of priority. Let's assume the following situation: Segment C is not sending any traffic. Segment A is only sending realtime traffic, as fast as it can (enough to saturate the link alone) and Segment B is only sending bulk traffic, as fast as it can (again, enough to saturate the full link alone). What will happen? Case 1: Segment A-High Prio and Segment B-Low Prio both have packets to send, since A-High Prio has the higher priority, it will always be scheduled first, till it hits its rate. Now it tries to borrow from Segment A, but since Segment A is on a higher level and Segment B-Low Prio has not yet hit its rate, this class is now served first, till it also hits the rate and wants to borrow from Segment B. Once both have hit their rates, both are on the same level again and now Segment A-High Prio is going to win again, until it hits the rate of Segment A. Now it tries to borrow from root (which has plenty of traffic spare, as Segment C is not using any of its guaranteed traffic), but again, it has to wait for Segment B-Low Prio to also reach the root level. Once that happens, priority is taken into account again and this time Segment A-High Prio will get all the bandwidth left over from Segment C. Case 2: High Prio-Segment A and Low Prio-Segment B both have packets to send, again High Prio-Segment A is going to win as it has the higher priority. Once it hits its rate, it tries to borrow from High Prio, which has bandwidth spare, but being on a higher level, it has to wait for Low Prio-Segment B again to also hit its rate. Once both have hit their rate and both have to borrow, High Prio-Segment A will win again until it hits the rate of the High Prio class. Once that happens, it tries to borrow from root, which has again plenty of bandwidth left (all bandwidth of Normal Prio is unused at the moment), but it has to wait again until Low Prio-Segment B hits the rate limit of the Low Prio class and also tries to borrow from root. Finally both classes try to borrow from root, priority is taken into account, and High Prio-Segment A gets all bandwidth root has left over. Both cases seem sub-optimal, as either way realtime traffic sometimes has to wait for bulk traffic, even though there is plenty of bandwidth left it could borrow. However, in case 2 it seems like the realtime traffic has to wait less than in case 1, since it only has to wait till the bulk traffic rate is hit, which is most likely less than the rate of a whole segment (and in case 1 that is the rate it has to wait for). Or am I totally wrong here? I thought about even simpler setups, using a priority qdisc. But priority queues have the big problem that they cause starvation if they are not somehow limited. Starvation is not acceptable. Of course one can put a TBF (Token Bucket Filter) into each priority class to limit the rate and thus avoid starvation, but when doing so, a single priority class cannot saturate the link on its own any longer, even if all other priority classes are empty, the TBF will prevent that from happening. And this is also sub-optimal, since why wouldn't a class get 100% of the line's bandwidth if no other class needs any of it at the moment? Any comments or ideas regarding this setup? It seems so hard to do using standard tc qdiscs. As a programmer it was such an easy task if I could simply write my own scheduler (which I'm not allowed to do).

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  • Create an XML file using Datasets Using info from XML Schema

    - by Voulnet
    Hello there, I have been thinking about the optimal way to create an XML file using data from a Dataset AND according to the rules of an XML schema. I've been searching around for a bit, and I failed to find a way in which I only take the data from the Dataset and put it inside a XML tags, with the tags being defined by an already-existing schema. So it might go like this: 1- Create Dataset and fill its rows with data. 2- Create an XML according to an XML schema rules. 3- Fill said XML file with data from Dataset such that data is taken from the Dataset while structure of the XML file is taken from the XML schema.

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  • jquery buttonset()

    - by Kevin
    Hi - I'm using the jquery buttonset() on a set of radio buttons (to tart them up). I'd like to be able to set the selected radio button on another user event. I've been looking into this and while I can set the selected radio button, but I cannot also (easily) update the UI to indicate what the selected radio button is. From what I can tell, I need to call this to set the radio button at index n to be checked $('input[name="transactionsRadio"]')[n].checked = true; And then do some convoluted jquery selector calls to remove the ui-state-active from one lable and apply it to the new label. Is this really the most optimal way to do this ? I had expected an equivalent method to the 'activate' method that is available for the jquery Accordian control. Any more elegant solution would be appreciated! Thanks, Kevin.

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  • Forcing a mixed ISO-8859-1 and UTF-8 multi-line string into UTF-8

    - by knorv
    Consider the following problem: A multi-line string $junk contains some lines which are encoded in UTF-8 and some in ISO-8859-1. I don't know a priori which lines are in which encoding, so heuristics will be needed. I want to turn $junk into pure UTF-8 with proper re-encoding of the ISO-8859-1 lines. Also, in the event of errors in the processing I want to provide a "best effort result" rather than throwing an error. My current attempt looks like this: $junk = &force_utf8($junk); sub force_utf8 { my $input = shift; my $output = ''; foreach my $line (split(/\n/, $input)) { if (utf8::valid($line)) { utf8::decode($line); } $output .= "$line\n"; } return $output; } While this appears to work I'm certain this is not the optimal solution. How would you improve my force_utf8(...) sub?

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  • MySQL Query Select using sub-select takes too long

    - by True Soft
    I noticed something strange while executing a select from 2 tables: SELECT * FROM table_1 WHERE id IN ( SELECT id_element FROM table_2 WHERE column_2=3103); This query took approximatively 242 seconds. But when I executed the subquery SELECT id_element FROM table_2 WHERE column_2=3103 it took less than 0.002s (and resulted 2 rows). Then, when I did SELECT * FROM table_1 WHERE id IN (/* prev.result */) it was the same: 0.002s. I was wondering why MySQL is doing the first query like that, taking much more time than the last 2 queries separately? Is it an optimal solution for selecting something based from the results of a sub-query? Other details: table_1 has approx. 9000 rows, and table_2 has 90000 rows. After I added an index on column_2 from table_2, the first query took 0.15s.

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  • Complete if statement with strings and array of strings

    - by RandomBen
    I have a page that has 3 variables. They look like this: String[] Headers = new String[] { "Max Width", "Max Length", "Max Height" }; String currentHeader = (String)HttpContext.Current.Request.QueryString["ItemHas"] ?? ""; String checkString = (String)HttpContext.Current.Request.QueryString["ItemIn"] ?? ""; The checkString is a list of Headers delimited by a "|". What is the easiest way to check if my currentHeader is in my Headers array and in my checkString String? I can do it but not in less than 20 lines of code. That seems like a less than optimal solution.

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  • How can I extract similarities/patterns from a collection of binary strings?

    - by JohnIdol
    I have a collection of binary strings of given size encoding effective solutions to a given problem. By looking at them, I can spot obvious similarities and intuitively see patterns of symmetry and periodicity. Are there mathematical/algorithmic tools I can "feed" this set of strings to and get results that might give me an idea of what this set of strings have in common? By doing so I would be able to impose a structure (or at least favor some features over others) on candidate solutions in order to greatly reduce the search space, maximizing chances to find optimal solutions for my problem (I am using genetic algorithms as the search tool - but this is not pivotal to the question). Any pointers/approaches appreciated.

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  • Masking a Drawable/Bitmap on Android

    - by Joshua Rodgers
    I'm currently looking for a way to use a black and white bitmap to mask the alpha channel of another bitmap or Drawable on Android. I'm curious as to what the best way to do this is. I certainly have a couple of ideas for how to do this, but they are not optimal. I need to be able to apply a new mask to the image every so often (the black and white bitmap will change every few seconds). Any feedback on how to achieve this would be greatly appreciated.

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  • vim filters and stdout/stderr

    - by ahe
    When I use :%! to run the contents of a file through a filter and the filter fails (it returns another code than 0) and prints an error message to stderr I get my file replaced with this error message. Is there a way to tell vim to skip the filtering if the filter returns an status code that indicates an error and/or ignore output the filter program writes to stderr? There are cases where you want your file to replaced with the output of the filter but most often this behavior is wrong. Of course I can just undo the filtering with one keypress but it isn't optimal. Also I have a similar problem when writing a custom vim script to do the filtering. I have a script that calls a filter program with system() and replaces the file in the buffer with its output but there doesn't seem to be a way to detect if the lines returned by system() where written to stdout or to stderr. Is there a way to tell them apart in vim script?

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  • What is the relaxation condition in graph theory

    - by windopal
    Hi, I'm trying to understand the main concepts of graph theory and the algorithms within it. Most algorithms seem to contain a "Relaxation Condition" I'm unsure about what this is. Could some one explain it to me please. An example of this is dijkstras algorithm, here is the pseudo-code. 1 function Dijkstra(Graph, source): 2 for each vertex v in Graph: // Initializations 3 dist[v] := infinity // Unknown distance function from source to v 4 previous[v] := undefined // Previous node in optimal path from source 5 dist[source] := 0 // Distance from source to source 6 Q := the set of all nodes in Graph // All nodes in the graph are unoptimized - thus are in Q 7 while Q is not empty: // The main loop 8 u := vertex in Q with smallest dist[] 9 if dist[u] = infinity: 10 break // all remaining vertices are inaccessible from source 11 remove u from Q 12 for each neighbor v of u: // where v has not yet been removed from Q. 13 alt := dist[u] + dist_between(u, v) 14 if alt < dist[v]: // Relax (u,v,a) 15 dist[v] := alt 16 previous[v] := u 17 return dist[] Thanks

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  • Mapping table and a simple view with Fluent NHibernate

    - by adrin
    I have mapped a simple entity, let's say an invoice using Fluent NHibernate, everything works fine... after a while it turns out that very frequently i need to process 'sent invoices' (by sent invoices we mean all entities that fulfill invoice.sent==true condition)... is there a way to easily abstract 'sent invoices' in terms of my data access layer? I dont like the idea of having aforementioned condition repeated in half of my repository methods. I thought that using a simple filtering view would be optimal, but how could it be done? Maybe I am doing it terribly wrong and someone would help me realize it :)?

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  • Recompile a x86 code with LLVM to some faster one x86

    - by osgx
    Hello Is it possible to run LLVM compiler with input of x86 32bit code? There is a huge algorithm which I have no source code and I want to make it run faster on the same hardware. Can I translate it from x86 back to x86 with optimizations. This Code runs a long time, so I want to do static recompilation of it. Also, I can do a runtime profile of it and give to LLVM hints, which branches are more probable. The original Code is written for x86, and uses no SSE/MMX/SSE2. After recompilation It has a chances to use x86_64 and/or SSE3. Also, The code will be regenerated in more optimal way to hardware decoder. Thanks.

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  • 3 dimensional bin packing algorithms

    - by BuschnicK
    I'm faced with a 3 dimensional bin packing problem and am currently conducting some preliminary research as to which algorithms/heuristics are currently yielding the best results. Since the problem is NP hard I do not expect to find the optimal solution in every case, but I was wondering: 1) what are the best exact solvers? Branch and Bound? What problem instance sizes can I expect to solve with reasonable computing resources? 2) what are the best heuristic solvers? 3) What off-the-shelf solutions exist to conduct some experiments with?

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