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  • dealing with a large flat data files with a very big record length

    - by gsp
    I have a large data file that is creatd from a shell script. Next script processes it by sorting and reading several times, that takes more than 14 hours, it is not viable. I want to replace this long running script with a program, probably in JAVA, C, or COBOl, that can run on windows or on sun solaris. I have to read a group of records everytime, sort and process and write to the output sort file and at the same time insert into db2/sql tables.

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  • Implementing an Online Waiting Room

    - by saalon
    My organization is building a new version of our ticketing site and is looking for the best way to build an online waiting room when the number of users in our purchase path exceeds a certain limit. The best version of this queue would let new users in after existing users have either completed their purchase or have exceeded a timeout limit after entering the path. I'm trying to get an idea of how this has been implemented by other organizations. Has anyone out there done something similar or have any experience with this? We have some ideas, but I'd like to get a sense of what solutions have been tried and what problems those solutions have run up against. Just to be complete, this site is being built in Ruby on Rails, though I'd love to hear about how people have solved this regardless of platform.

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  • C/C++ variable length automatic array performance

    - by aaa
    hello. Is there significant cpu/memory overhead associated with using automatic arrays with g++/Intel on 64-bit x86 linux platform? int function(int N) { double array[N]; overhead compared to allocating array before hand (assuming function is called multiple times) overhead compared to using new overhead compared to using malloc range of N maybe from 1kb to 16kb roughly, stack overrun is not a problem Thank you

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  • BitLocker with Windows DPAPI Encryption Key Management

    - by bigmac
    We have a need to enforce resting encryption on an iSCSI LUN that is accessible from within a Hyper-V virtual machine. We have implementing a working solution using BitLocker, using Windows Server 2012 on a Hyper-V Virtual Server which has iSCSI access to a LUN on our SAN. We were able to successfully do this by using the "floppy disk key storage" hack as defined in THIS POST. However, this method seems "hokey" to me. In my continued research, I found out that the Amazon Corporate IT team published a WHITEPAPER that outlined exactly what I was looking for in a more elegant solution, without the "floppy disk hack". On page 7 of this white paper, they state that they implemented Windows DPAPI Encryption Key Management to securely manage their BitLocker keys. This is exactly what I am looking to do, but they stated that they had to write a script to do this, yet they don't provide the script or even any pointers on how to create one. Does anyone have details on how to create a "script in conjunction with a service and a key-store file protected by the server’s machine account DPAPI key" (as they state in the whitepaper) to manage and auto-unlock BitLocker volumes? Any advice is appreciated.

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  • win8: access denied to external USB disk; update access rights fails

    - by Gerard
    I use to work with 2 laptops (vista and win7), my work being files on an external usb disk. My oldest laptop broke down, so I bought a new one. I had no option other than take win8. 1/ I suspect something changed with access rights, as my external disk suffered some "access denied" problem on win8. I was prompted (by win8) somehow to fix the access rights, which I tried to do, getting to the properties - security. This process was very slow and ended up saying "disk is not ready". Additonnally, the usb somehow was not recognized anymore. 2/ Back to win7, I was warned that my disk needed to be verified, which I did. In this process, some files were lost (most of them i could recover from the folder found00x, but I have some backup anyway). Also, I don't know why, but under win7, all the folder showed with a lock. 3/ Then back again to win8. Same problem : access denied to my disk + no way to change access rights as it gets stuck "disk is not ready". Now I am pretty sure there is some kind of bug or inconsistence in win8 / win7. I did 2/ and 3/ a few times. At some point, I also got an access denied in win7. I could restore access rigths to the disk to "system" (properties - security - EDIT for full control to group "system" ...). But then I still get the same access right pb on win8, and getting stuck in the process to restore full control to "system" -- and "admin" groups. Now, after I tried for more than 3 days, I am losing my patience with that bloody win8 which I did not want to buy but had no choice. I upgraded win8 with the windows updates available. Does not help. Anybody can help me ?

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  • Does a 3ware "ECC-ERROR" matter on a JBOD when I have ZFS?

    - by Stefan Lasiewski
    I have a FreeBSD 8.x machine running ZFS and with a 3ware 9690SA controller. The 3ware controller shows an ECC-ERROR with one of the disks: //host> /c0 show VPort Status Unit Size Type Phy Encl-Slot Model ------------------------------------------------------------------------------ p0 OK u0 279.39 GB SAS 0 - SEAGATE ST3300657SS p1 OK u0 279.39 GB SAS 1 - SEAGATE ST3300657SS p2 OK u1 931.51 GB SAS 2 - SEAGATE ST31000640SS p3 ECC-ERROR u2 931.51 GB SAS 3 - SEAGATE ST31000640SS p4 OK u3 931.51 GB SAS 4 - SEAGATE ST31000640SS /c0 show events shows no ECC errors in it's recent history. ZFS does not currently detect any errors. zpool status says No known data errors My question: Is this ECC-ERROR something that I need to be concerned about? According to the 3ware CLI 9.5.2 Manual, an ECC-ERROR means that the 3ware controller caught a read-error for one or more sectors on this drive. This sometimes occurs when a RAID array is recovering from a failed disk. I believe that ECC-ERRORS can also be detected when the 3ware Controller verifies each disk. None of the drives have failed and thus there was no drive rebuild, so I assume that 3ware discovered a bad sector when it ran it's weekly auto-verify scan of the disks. Is this a safe assumption? According to our logs, ZFS has not detected any bad sectors on this drive. ZFS can work around read errors -- if ZFS detects a bad sector on the drive, it will simply mark that sector as bad and never use it again. From the ZFS perspective one bad sector isn't a big deal, although it might indicate that the drive is starting to go bad.

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  • How to configure VirtualBox server for performance at home

    - by BluJai
    I currently have two physical Ubuntu Server 10.10 servers at home: one serves as our firewall/router/DHCP/VPN server and the other performs double-duty as a file server and a VirtualBox host for an Ubuntu Desktop 10.10 machine which I use from remote connections (via NoMachine) for many thin-client purposes which are irrelevant to my question. What I'd like to accomplish is to consolidate the two physical machines into one which is a dedicated VirtualBox host (most likely running Ubuntu Server 10.10). Note that I'd like to stick with VirtualBox (if possible) because I'm most comfortable with it and use it on a daily basis at both home and work. Specifically, I plan to have one VM set up as file server, another as the firewall/router/DHCP/VPN (or possibly split those a bit) and a third, which is the only current VM (already VirtualBox), which is the thin-client host. My question comes down to performance and/or recommendations about the file server VM. The file server hosts about 6 terabytes of data across 4 drives. What I'd like to do is use raw disk access from the VM directly to the existing disks. However, I'm curious what performance advantage/disadvantage that would have as compared to using shared folders from the VM host and basically just have the whole drive served as a shared folder to the VM which would then serve it to the other machines on the network. I don't know if virtual disks would even work in this scenario and I certainly wouldn't want a drive to be filled with just a single file which is 1.5 TB (disk image). To add understanding of context, but not to get additional advice, I want to virtualize these machines because I intend to regularly use the snapshot capabilities of VirtualBox for the system disks (which will be virtual drives) of the VMs and I have some physical space/power needs to address (as I mentioned, this is at home).

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  • How to configure VirtualBox server for performance at home

    - by BluJai
    I currently have two physical Ubuntu Server 10.10 servers at home: one serves as our firewall/router/DHCP/VPN server and the other performs double-duty as a file server and a VirtualBox host for an Ubuntu Desktop 10.10 machine which I use from remote connections (via NoMachine) for many thin-client purposes which are irrelevant to my question. What I'd like to accomplish is to consolidate the two physical machines into one which is a dedicated VirtualBox host (most likely running Ubuntu Server 10.10). Note that I'd like to stick with VirtualBox (if possible) because I'm most comfortable with it and use it on a daily basis at both home and work. Specifically, I plan to have one VM set up as file server, another as the firewall/router/DHCP/VPN (or possibly split those a bit) and a third, which is the only current VM (already VirtualBox), which is the thin-client host. My question comes down to performance and/or recommendations about the file server VM. The file server hosts about 6 terabytes of data across 4 drives. What I'd like to do is use raw disk access from the VM directly to the existing disks. However, I'm curious what performance advantage/disadvantage that would have as compared to using shared folders from the VM host and basically just have the whole drive served as a shared folder to the VM which would then serve it to the other machines on the network. I don't know if virtual disks would even work in this scenario and I certainly wouldn't want a drive to be filled with just a single file which is 1.5 TB (disk image). To add understanding of context, but not to get additional advice, I want to virtualize these machines because I intend to regularly use the snapshot capabilities of VirtualBox for the system disks (which will be virtual drives) of the VMs and I have some physical space/power needs to address (as I mentioned, this is at home).

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  • Cannot access drive in Windows 7 after scandisk lockup, but can in safe mode....

    - by Matt Thompson
    I ran scandisk on my external USB drive due to the inability to delete a few files. Windows asked me if I wanted to unmount the drive before the scan, warning me that it would be unusable until the scan was finished, and I said yes. During the scan, my machine locked up, and I was forced to reboot the machine. When it came up, I was unable to access the drive, getting an error that "L:is not accessible, access is denied". Comupter Management sees the drive, and has the proper amount of disk space filled. I booted into safe mode, and can access the drive with no problems, and I noticed that in explorer, all the folders have locks on them. I booted back into windows, but still could not access the drive, getting the same error as above. Hovever, if I right click on the drive, select properties, and go to Customize, in the folder pictures ares, I select Choose File, and a window open up, that shows the root of the directory, with all the folder able to be accessed, but again, the icon is the folder icon with a lock on it. I can even copy files from the drive to another. So, the files are not gone, windows can obviously access the drive no matter what it thinks, so there has to be a problem with the flag windows put on the drive when it ran the original scan that failed. I was able to run a scan both in safe mode with no problems, and in windows. In windows, I received the cannot access error the first time I run scan disk on it, but if I try again, it works fine. Any ideas on how to clear the flag that windows set, so I can access the drive normally again?

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  • PC only boots from Linux-based media and won't boot from DOS-based media

    - by Xolstice
    I have this problem where the PC only seems to boot from a floppy disk or CD if it was created as a Linux-based bootable media. If it was created as a DOS-based bootable media the system just freezes at the starting point of the boot process. I originally asked this under question 139515 for CD booting only, and based on the given answers, I was under the impression the problem was with the CD-ROM drive; however, I have since installed a newly purchased CD-ROM drive and the same freezing occurs. This then made me try the DOS bootable floppy disk approach and I was quite surprised that it exhibited the same freezing problem. I then tried try a Linux bootable floppy and everything booted from it without any issues. As I mentioned in my original question, the PC was booting just fine from the DOS-based bootable CD, and then it suddenly decides to pull this freezing stunt. I can't remember if I changed anything in the BIOS settings that may I have caused the problem, but I am wondering if that could be the case - it is currently using the Award Module BIOS v4.60PGMA. Can anyone help?

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  • Quota, AD and C#

    - by Gnial0id
    At first, my mother tongue is not English, so I apologize for the possible mistakes. I'm working on a WS2008R2 server with an Active Directory and a web platform manages this AD with C# code. A group of users have to be able to create user accounts but during the procedure, a disk quota for this new account is (and have to be) created. As the "creator" must not be a member of the Administrators group, the access to the c/: disk is denied. So, I want to perform the File Server Resource Manager operations with C# code by an non-admin account. The code is correct, it works normally with admin account. So, the problem turns around the permissions on the hard drive. I've looked after help on the Internet, without success. It seems that quota delegation is impossible. Only admin can perform this. A colleague helped me a bit, and found the GPO "By pass traverse checking" on a forum but it doesn't seems to be the good way. Any help would be appreciate.

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  • Copy all installed programs & files in a hard disk (which has 32 bit Windows 7) and clone/transfer it to another computer which has 64 bit Windows 7

    - by galacticninja
    I recently got a new PC which has a 64-bit Windows 7 installed. The current PC that I am using has a 32-bit Windows 7 installed. I would like to know if there is a software that can copy all my installed programs and files in the hard disk with the 32-bit Windows 7 PC and transfer it to the newer PC's hard disk which has a 64 bit version of Windows 7. This is essentially like "cloning" a hard disk but I would like to use a 64-bit OS in the target drive, instead of also using the 32-bit OS of the source drive. I would like to do this I can avoid reinstalling and reconfiguring my installed programs and files again on the new PC. If possible, I would like the new PC to work as it was in my previous PC, with the installed programs, configuration and files intact except that the OS is now 64-bit and the hard disk has a larger capacity. I have heard of programs that can clone a hard disk, but my concern is that the 32-bit Windows 7 OS will also be cloned to the new 64-bit PC. If it is not possible to transfer my installed programs and settings like the way I described, are there software that can make it easier to migrate my installed programs, their configurations and my files from a 32-bit Windows 7 PC to a 64-bit Windows 7 PC? Details: I have a SATA to USB connector/adapter to copy files in the current hard disk to the newer one. The two PCs are connected through LAN, so I can also transfer files through LAN. Both PCs only have one hard disk.

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  • Dell PowerEdge T710, add a new hard disk, how to?

    - by user1340802
    I need to add a new hard disk to a PowerEdge T710 running on Vmware EXSI 4. this hard disk is a 'normal' desktop hard disk 1TB (that is it is not coming from Dell, I also have no rack for it to plug it inside any of the front bay) I would like to add this disk for a virtual machine needing space, the most easily as possible. I have find that there is an avaiable sata cable with its electric power, so may I just add the disk plugging these and using the empty 5"1/4 slot available under the CD drive (with a 5"1/4 - 3"1/2 bay adaptater) ? (even if this way it seems that i bypass the raid controller that own the front bay with racks)) that way i think could be easier than adding the disk to the already defined Raid (btw i am also not sure on how to do these but i would not risk to mess the already working things) what are the other operations that i would have to do to ? (sorry I am a real beginner on Vmware EXSI and PowerEdge management :/ i have seen that there is some management from Bios (CTRL+R as start up) so that the disk will be seen or initialize it. I am really not sure of the steps needed...) thank you, best.

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  • HD working with IDE USB adapter but not recognised by bios

    - by Rajeeva
    I have a Windows XP Pentium III desktop with two hard drives. The first one has the OS and is luckily working. The second drive on the secondary master IDE channel few days back was unable to read some files and since then for some time it was failing and reviving intermittently and now it is always showing as failed on the IDE channel When the HD was intermittenly failing, I was able to copy some data from it to the other drive - also during that time if the system was running and the hard disk failed at that time, the system froze and then i had to reboot. then I got a new 80 gb hdd similar (same make - seagate barracuda) to the earlier failing one, a new data cable for the drive and an IDE to USB adapter. the new hard drive i installed in the previous drive's place (secondary master), formatted it and it worked for 1 day and then it also failed - simultaneously i connected the old hd to the IDE/USB adapter and i could view all the data - some of that data i was able to back up from the old hd to the new hd before the new hd failed the new hd i have tried connecting on the primary channel as the slave disk but when i do that then the bios does not detect either the OS drive or the new drive and the system does not boot surprisingly, the older (previously failed) hd and the new hd are both working fine on the usb channel with the IDE/USB adapter. i have ruled out any problem with the secondary channel since the dvd rom i was earlier using as primary slave have now connected to secondary master and it works fine. i am really confused by this behavior on my system. please can anybody try to solve this for me. thanks.

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  • 750Gig Hard Drive shows full with only 315Gigs used

    - by Chris Kelly
    I have a Win7 laptop with a 750Gig C: drive. It came partitioned with 714Gig usable from manufacturer. I installed programs, music files, etc up to 285 gigs. As of a few weeks ago it showed 285 Gigs. Two weeks of house guests later and it shows HD is full. I deleted some files but it still shows 652 Gigs on this drive while there are only 285 Gigs on drive. Relevant details: I am Administrator on laptop and have fair knowledge of what I am doing. I did not restore from backup, restore from mirror, upgrade HD's or anything else that would have touched the partition structure. Just daily use as imaging machine and web. I have checked partitions under disk administrator - no change, still partitioned with 714Gigs usable. Have looked through computer C drive by hand showing Hidden files and folders - no change. I have used JDisk Report to double check - it shows I have only 285 Gigs on C drive. I triple checked with TreeSize run as Administrator and it also shows 285 Gigs on C drive - yet Windows 7 still shows almost full. I used Windows 7 Utilities to Check for Disk Errors, and Defragged the drive. No errors shown and no change after Defrag.

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  • mysql disk io keeps increasing ... is that normal?

    - by trustfundbaby
    So I've been trying to figure out this disk IO problem I have been having with my linode VPS. Over the last day or two I've just left watch -n1 pidstat -d running in a console window and the output looks like this: Monitoring it over the last few days, I've noticed that my problem lies with the init, searchd, and mysql processes. Searchd is sphinx and all its indexes are on disk, so disk io there is inevitable (apparently). What I can't understand is why the disk reads (kB_rd/s) for mysql refuse to stabilize and just keep going up. It started out at 154 yesterday and is up to what you see in that screen shot. but disk writes (kB_wr/s) have remained pretty constant the entire time. My VPS only has 768MB RAM, my mysql db has a size of about 220MB and after running mysqltuner.pl and reading a bit about it, I've been advised to set my innodb_buffer_pool_size to 220MB but I simply cannot afford to do that ... I have it up to 150MB. My question is twofold. Why does the init process have that much disk reading to do? Why is mysql doing so much disk reading?

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  • how can I fix error: hd0 out of disk?

    - by rux
    I am running Ubuntu 12.04 on a netbook - Acer AS 1410. After a download session, I restarted the computer and it said: error: hd0 out of disk. Press any key to continue... I pressed everything, but it's just frozen there. Any idea what's wrong with it and what I can do to fix it? I haven't been able to run my computer at all since it's frozen like that. Help please! I booted the live cd and ran sudo fdisk -lu into terminal, and here's what it gave me: Disk /dev/sda: 60.0 GB, 60022480896 bytes 255 heads, 63 sectors/track, 7297 cylinders, total 117231408 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: 0x9a696263 Device Boot Start End Blocks Id System /dev/sda3 2048 117229567 58613760 5 Extended /dev/sda5 * 71647232 109039615 18696192 83 Linux /dev/sda6 109041664 117229567 4093952 82 Linux swap / Solaris /dev/sda7 4096 71645183 35820544 83 Linux Partition table entries are not in disk order I am somewhat of a beginner in this, so don't know what this means. any ideas? Thanks!

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  • Splitting a raidctl mirror safely

    - by milkfilk
    I have a Sun T5220 server with the onboard LSI card and two disks that were in a RAID 1 mirror. The data is not important right now but we had a failed disk and are trying to understand how to do this for real if we had to recover from a failure. The initial situation looked like this: # raidctl -l c1t0d0 Volume Size Stripe Status Cache RAID Sub Size Level Disk ---------------------------------------------------------------- c1t0d0 136.6G N/A DEGRADED OFF RAID1 0.1.0 136.6G GOOD N/A 136.6G FAILED Green light on the 0.0.0 disk. Find / lights up the 0.1.0 disk. So I know I have a bad drive and which one it is. Server still boots obviously. First, we tried putting a new disk in. This disk came from an unknown source. Format would not see it, cfgadm -al would not see it so raidctl -l would not see it. I figure it's bad. We tried another disk from another spare server: # raidctl -c c1t1d0 c1t0d0 (where t1 is my good disk - 0.1.0) Disk has occupied space. Also the different syntax options don't change anything: # raidctl -C "0.1.0 0.0.0" -r 1 1 Disk has occupied space. # raidctl -C "0.1.0 0.0.0" 1 Disk has occupied space. Ok. Maybe this is because the disk from the spare server had a RAID 1 on it already. Aha, I can see another volume in raidctl: # raidctl -l Controller: 1 Volume:c1t1d0 (this is my server's root mirror) Volume:c1t132d0 (this is the foreign root mirror) Disk: 0.0.0 Disk: 0.1.0 ... No problem. I don't care about the data, I'll just delete the foreign mirror. # raidctl -d c1t132d0 (warning about data deletion but it works) At this point, /usr/bin/ binaries freak out. By that I mean, ls -l /usr/bin/which shows 1.4k but cat /usr/bin/which gives me a newline. Great, I just blew away the binaries (ie: binaries in mem still work)? I bounce the box. It all comes back fine. WTF. Anyway, back to recreating my mirror. # raidctl -l Controller: 1 Volume:c1t1d0 (this is my server's root mirror) Disk: 0.0.0 Disk: 0.1.0 ... Man says that you can delete a mirror and it will split it. Ok, I'll delete the root mirror. # raidctl -d c1t0d0 Array in use. (this might not be the exact error) I googled this and found of course you can't do this (even with -f) while booted off the mirror. Ok. I boot cdrom -s and deleted the volume. Now I have one disk that has a type of "LSI-Logical-Volume" on c1t1d0 (where my data is) and a brand new "Hitachi 146GB" on c1t0d0 (what I'm trying to mirror to): (booted off the CD) # raidctl -c c1t1d0 c1t0d0 (man says it's source destination for mirroring) Illegal Array Layout. # raidctl -C "0.1.0 0.0.0" -r 1 1 (alt syntax per man) Illegal Array Layout. # raidctl -C "0.1.0 0.0.0" 1 (assumes raid1, no help) Illegal Array Layout. Same size disks, same manufacturer but I did delete the volume instead of throwing in a blank disk and waiting for it to resync. Maybe this was a critical error. I tried selecting the type in format for my good disk to be a plain 146gb disk but it resets the partition table which I'm pretty sure would wipe the data (bad if this was production). Am I boned? Anyone have experience with breaking and resyncing a mirror? There's nothing on Google about "Illegal Array Layout" so here's my contrib to the search gods.

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  • Returning from dll (Asynchronous sockets)

    - by Juha
    I am trying to do a simple http-server in (c++) dll-file that I can use from managed (C#) application with P/Invoke. I was trying to do this with asynchronous functions (WSAAsyncSelect() and stuff), so that I could manage server by calling functions inside dll whenever needed and after that it would return to my main program. Now I'm not sure if that is even possible. It seems that "main function" in dll, the function that starts the server, has to include message loop or something and since it's a loop, it doesn't return from dll ever. Could I somehow do this message stuff in my managed application and call some function in dll when there is something to do? Or is it even possible to do this stuff in one thred? I would really like to avoid all concurrency stuff. The dll looks now basicly the same as here, main function is the one that I call from managed C# program and would like to return to there after calling the function. http://www.winsocketdotnetworkprogramming.com/winsock2programming/winsock2advancediomethod5b.html I'm quite noob in windows programming, and never even heard of this message-queue or message-loop.

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  • Triggering PHP from ActiveMQ

    - by scompt.com
    Background: Our current system involves two services (one written in Java, the other in PHP) that communicate with each other using HTTP callbacks. We would like to migrate from HTTP callbacks to a message-based architecture using ActiveMQ (or another, if necessary). We'll probably use STOMP to communicate between them. Eventually, the PHP service will be rewritten in Java, but that's not part of this project. Question: How can the ActiveMQ system notify PHP that a new message has been posted to the queue that the PHP system is subscribed to? In the current system, the callback inherently calls into the PHP and triggers it. This goes away with a message-based architecture. Possible solutions: Cron regularly calls a PHP script that checks for new messages. yuck. A long-running PHP process that loops and sleeps and checks for new messages. less yuck? ActiveMQ calls a PHP script when a new message is posted. good, how? ??

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  • PocketPC c++ windows message processing recursion problem

    - by user197350
    Hello, I am having a problem in a large scale application that seems related to windows messaging on the Pocket PC. What I have is a PocketPC application written in c++. It has only one standard message loop. while (GetMessage (&msg, NULL, 0, 0)) { { TranslateMessage (&msg); DispatchMessage (&msg); } } We also have standard dlgProc's. In the switch of the dlgProc, we will call a proprietary 3rd party API. This API uses a socket connection to communicate with another process. The problem I am seeing is this: whenever two of the same messages come in quickly (from the user clicking the screen twice too fast and shouldn't be) it seems as though recursion is created. Windows begins processing the first message, gets the api into a thread safe state, and then jumps to process the next (identical ui) message. Well since the second message also makes the API call, the call fails because it is locked. Because of the design of this legacy system, the API will be locked until the recursion comes back out (which also is triggered by the user; so it could be locked the entire working day). I am struggling to figure out exactly why this is happening and what I can do about it. Is this because windows recognizes the socket communication will take time and preempts it? Is there a way I can force this API call to complete before preemption? Is there a way I can slow down the message processing or re-queue the message to ensure the first will execute (capturing it and doing a PostMessage back to itself didnt work). We don't want to lock the ui down while the first call completes. Any insight is greatly appreciated! Thanks!!

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  • What happens to my PriorityQueue if my Comparator throws an exception while it's busy bubbling up or

    - by nieldw
    Hi, I'm trying order pairs of integers ascendantly where a pair is considered less than another pair if both its entries are strictly less than those of the other pair, and larger than the other pair if both its entries are strictly larger than those of the other pair. All other cases are considered incomparable. They way I want to solve this is by defining a Comparator that implements the above, but will throw an exception for incomparable cases, and provide that to a PriorityQueue. Of course, while inserting a pair the priority queue does several comparisons while bubbling the new entry up to its correct position in the heap, and many of these will be comparable. But it may happen during the bubbling process that a pair is encountered with which this new pair is incomparable, and an exception will be thrown. If this happens, what will be the state of the PriorityQueue? Will the pair I was trying to insert sit in the heap at the last position it was in before the exception was thrown? If I use the PriorityQueue's remove(Object o) method, will the PriorityQueue be restored to a consistent state? Thanks

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  • How to work threading with ConcurrentQueue<T>.

    - by dboarman
    I am trying to figure out what the best way of working with a queue will be. I have a process that returns a DataTable. Each DataTable, in turn, is merged with the previous DataTable. There is one problem, too many records to hold until the final BulkCopy (OutOfMemory). So, I have determined that I should process each incoming DataTable immediately. Thinking about the ConcurrentQueue<T>...but I don't see how the WriteQueuedData() method would know to dequeue a table and write it to the database. For instance: public class TableTransporter { private ConcurrentQueue<DataTable> tableQueue = new ConcurrentQueue<DataTable>(); public TableTransporter() { tableQueue.OnItemQueued += new EventHandler(WriteQueuedData); // no events available } public void ExtractData() { DataTable table; // perform data extraction tableQueue.Enqueue(table); } private void WriteQueuedData(object sender, EventArgs e) { BulkCopy(e.Table); } } My first question is, aside from the fact that I don't actually have any events to subscribe to, if I call ExtractData() asynchronously will this be all that I need? Second, is there something I'm missing about the way ConcurrentQueue<T> functions and needing some form of trigger to work asynchronously with the queued objects?

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  • Trying to fadein divs in a sequence, over time, using JQuery

    - by user346602
    Hi, I'm trying to figure out how to make 4 images fade in sequentially when the page loads. The following is my (amateurish) code: Here is the HTML: <div id="outercorners"> <img id="corner1" src="images/corner1.gif" width="6" height="6" alt=""/> <img id="corner2" src="images/corner2.gif" width="6" height="6" alt=""/> <img id="corner3" src="images/corner3.gif" width="6" height="6" alt=""/> <img id="corner4" src="images/corner4.gif" width="6" height="6" alt=""/> </div><!-- end #outercorners--> Here is the JQuery: $(document).ready(function() { $("#corner1").fadeIn("2000", function(){ $("#corner3").fadeIn("4000", function(){ $("#corner2").fadeIn("6000", function(){ $("#corner4").fadeIn("8000", function(){ }); }); }); }); Here is the css: #outercorners { position: fixed; top:186px; left:186px; width:558px; height:372px; } #corner1 { position: fixed; top:186px; left:186px; display: none; } #corner2 { position: fixed; top:186px; left:744px; display: none; } #corner3 { position: fixed; top:558px; left:744px; display: none; } #corner4 { position: fixed; top:558px; left:186px; display: none; } They seem to just wink at me, rather than fade in in the order I've ascribed to them. Should I be using the queue() function? And, if so, how would I implement it in this case? Thank you for any assistance.

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