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  • Multi device BTRFS filesystem with disk of different size

    - by fokenrute
    I have an existing BTRFS filesystem composed of one 500GB disk and I just bought a 2TB disk to increase the storage capacity of my home server and I want add the new disk to the existing filesystem. From what I read, it seems like no BTRFS setup can handle disk of different sizes without wasting the difference in size between the larger and the smaller disk, but I'm new to BTRFS and I might have missed something, so is there a setup that can allow me to combine two disks in a filesystem without wasting space ?

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  • /dev/sda2 contains a filesystem with error after partitioning

    - by Private
    I just wanted to create a separate home partition on my Ubuntu 12.10 system. I booted the liveDVD, resized the sda2 partition (28gb of data resized to 30gb based on MiB [originally on a 100gb partition]) and made a new ext4 partition for the home folder. The drive is an SSD drive. I had changed the settings (noatime etc.) for SSD succesfully a week ago. On reboot I get the following error: /dev/sda2 contains a filesystem with errors Inode 74669 has an invalid extent node (blk 6881289) fsd / [953] terminated with status 4 What would you suggest me to do? If I can avoid a clean install that would save me a lot of time (I had just done all the config). I was following this HOWTO, but I did not get to changing any of the files or configs other than those with gparted. I have a (two-week old) SSD Samsung drive which is functioning just fine (other specs see bottom of this question). Other specs: 64bit 12.10, i7, 8gb ram, nvidia.

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  • LVM Extend... not sure the filesystem

    - by Dan
    I would like to extend my LVM partition. First I did lvextend -L +100G /dev/server/home Now I still have to extend the filesystem. The tutorials tell me to use resize2fs, but that only works for ext2 and ext3. I'm not even sure what filesystem I have... fdisk /dev/server/home/ doesn't work... how do I know what kind of filesystem I have on my lvm partition?

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  • Boost Netbook Speed with an SD Card & ReadyBoost

    - by Matthew Guay
    Looking for a way to increase the performance of your netbook?  Here’s how you can use a standard SD memory card or a USB flash drive to boost performance with ReadyBoost. Most netbooks ship with 1Gb of Ram, and many older netbooks shipped with even less.  Even if you want to add more ram, often they can only be upgraded to a max of 2GB.  With ReadyBoost in Windows 7, it’s easy to boost your system’s performance with flash memory.  If your netbook has an SD card slot, you can insert a memory card into it and just leave it there to always boost your netbook’s memory; otherwise, you can use a standard USB flash drive the same way. Also, you can use ReadyBoost on any desktop or laptop; ones with limited memory will see the most performance increase from using it. Please Note:  ReadyBoost requires at least 256Mb of free space on your flash drive, and also requires minimum read/write speeds.  Most modern memory cards or flash drives meet these requirements, but be aware that an old card may not work with it. Using ReadyBoost Insert an SD card into your card reader, or connect a USB flash drive to a USB port on your computer.  Windows will automatically see if your flash memory is ReadyBoost capable, and if so, you can directly choose to speed up your computer with ReadyBoost. The ReadyBoost settings dialog will open when you select this.  Choose “Use this device” and choose how much space you want ReadyBoost to use. Click Ok, and Windows will setup ReadyBoost and start using it to speed up your computer.  It will automatically use ReadyBoost whenever the card is connected to the computer. When you view your SD card or flash drive in Explorer, you will notice a ReadyBoost file the size you chose before.  This will be deleted when you eject your card or flash drive. If you need to remove your drive to use elsewhere, simply eject as normal. Windows will inform you that the drive is currently being used.  Make sure you have closed any programs or files you had open from the drive, and then press Continue to stop ReadyBoost and eject your drive. If you remove the drive without ejecting it, the ReadyBoost file may still remain on the drive.  You can delete this to save space on the drive, and the cache will be recreated when you use ReadyBoost next time. Conclusion Although ReadyBoost may not make your netbook feel like a Core i7 laptop with 6GB of RAM, it will still help performance and make multitasking even easier.  Also, if you have, say, a memory stick and a flash drive, you can use both of them with ReadyBoost for the maximum benefit.  We have even noticed better battery life when multitasking with ReadyBoost, as it lets you use your hard drive less.  SD cards and thumb drives are relatively cheap today, and many of us have several already, so this is a great way to improve netbook performance cheaply. Similar Articles Productive Geek Tips Speed up Your Windows Vista Computer with ReadyBoostSet the Speed Dial as the Opera Startup PageAsk the Readers: What are Your Computer’s Hardware Specs?Understanding Windows Vista Aero Glass RequirementsReplace Google Chrome’s New Tab Page with Speed Dial TouchFreeze Alternative in AutoHotkey The Icy Undertow Desktop Windows Home Server – Backup to LAN The Clear & Clean Desktop Use This Bookmarklet to Easily Get Albums Use AutoHotkey to Assign a Hotkey to a Specific Window Latest Software Reviews Tinyhacker Random Tips DVDFab 6 Revo Uninstaller Pro Registry Mechanic 9 for Windows PC Tools Internet Security Suite 2010 Recycle ! Find That Elusive Icon with FindIcons Looking for Good Windows Media Player 12 Plug-ins? Find Out the Celebrity You Resemble With FaceDouble Whoa ! Use Printflush to Solve Printing Problems

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  • Is complete boost going to be included in C++0x?

    - by iammilind
    Many utilities of boost have been included as part of extended C++ TR1 currently. Is the complete boost library going to be included once the standard is officially out ? In other words, do I need boost library, if I have complete standard conforming C++11 compiler ? If not then any reason for that (Reliability cannot be an issue; as far as I know it's written by many people from standard committee) ?

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  • 5 ways the Exceptional DBA Award could boost your career

    - by Rebecca Amos
    Winning the Exceptional DBA Award won’t just get you full conference registration for the PASS Summit – it could also change your life and career. With a little help from our past winners, here are the top 5 ways the Exceptional DBA Award could take your career to the next level: 1. Recognition from your peers As 2009 winner Josef Richberg says, “Being recognized by your peers is the highest honor one can receive.” Whether you enter yourself, or are nominated by a friend or colleague, the fact that the winner is selected by the SQL Server community is a great chance for your peers to recognize your achievements as a DBA. 2. Boost your CV Winning the Exceptional DBA Award not only shows that you excel as a DBA, but that SQL Server experts think so too – a huge vote of confidence for any prospective employer. 2008 winner Dan McClain agrees, “It brings another level of 'wow' to my resume”. 3. Networking opportunities within the community Whether you want to increase your experience as a writer, speaker or blogger, winning the Exceptional DBA Award can open up new opportunities within the SQL Server community. Plus you’ll make new friends along the way, as Josef has discovered: “It is an unbelievable community that has become an extended family.” 4. Award ceremony at the world's largest technical SQL Server conference The Exceptional DBA Award is presented at the PASS Summit, giving you great networking opportunities and a chance to be seen by people throughout the SQL Server community. 5. Increased personal confidence Finally, the Exceptional DBA Award should give a huge boost to your personal confidence. Last year’s winner, Tracy Hamlin has certainly found this: “The recognition has given me new confidence and the drive to accomplish even loftier goals.” Read the full interview with our past winners to find out how why they’re encouraging you to enter this year’s Exceptional DBA Awards. Already inspired? Then why not get started on your entry straightaway: www.exceptionaldba.com

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  • ext4 jbd2 journaling active even on empty filesystem

    - by Paul
    I have been having several issues with my ext4 filesystems that seem to be due to jbd2 journaling. I made a related post here and am rephrasing it with the hope that someone may be able to help. For a minimal example, I start with an empty 8gb USB stick and use gparted to create one ext4 partition. The command used by gparted when creating the ext4 file system is: mkfs.ext4 -j -O extent -L DataTraveler8gb /dev/sde1 I check the filesystem with gparted: e2fsck -f -y -v /dev/sde1 and I mount it: sudo mount /dev/sde1 /media/test The disk is empty, but the journaling is very active on this disk (/dev/sde1). The other disks are ext4 SSDs formatted similarly. A snapshot of iotop: % sudo iotop -oPa Total DISK READ: 0.00 B/s | Total DISK WRITE: 2027.21 K/s PID PRIO USER DISK READ DISK WRITE SWAPIN IO COMMAND 262 be/3 root 0.00 B 56.00 K 0.00 % 0.18 % [jbd2/sda1-8] 29069 be/3 root 0.00 B 0.00 B 0.00 % 0.16 % [jbd2/sde1-8] 891 be/3 root 0.00 B 4.00 K 0.00 % 0.03 % [jbd2/sdc1-8] What is jbd2 doing with /dev/sde1? If I follow the same steps with a larger 2Tb disk, iotop indicates this empty disk is constantly being written to by jbd2 at the rate of Mb/s as soon as I mount it. On the other disks, which have the OS and /home, I have tried to find if any files are being modified by processes to cause this behavior but couldn't find any. I also moved many of the disk intensive process to use a tmpfs. And used noatime. I have another non-SSD hard disk on this machine, /dev/sdb, that is also ext4 but was not formatted by gparted (given to me by a coworker). It does not appear in iotop. So I am assuming there an issue with gparted. Any suggestions are appreciated. Also any tips on how to modify existing partitions to fix the issue without having to start from scratch would be great. There are some posts related to jbd2 but they didn't help (eg. here).

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  • Copying files to zfs mountpoint doesn't work - the files aren't actually copied to the other filesystem,

    - by user113904
    I have 3 x 4 TB disks in a NAS that I want to group together and access as if they were one whole 'unit' of some kind. I also have a 250GB disk containing the OS - this is full of films and tv shows currently. I thought zfs sounded good so I created a raidz zpool, after installing the ppa sudo zpool create store raidz /dev/sdb /dev/sdc /dev/sdd and set the mountpoint to /mnt/store sudo zfs set mountpoint=/mnt/store /store checked it was successful - I think it was sudo zfs list NAME USED AVAIL REFER MOUNTPOINT store 266K 7.16T 170K /mnt/store Then I wanted to move over a whole load of files from my home directory. I went to where the to-be-copied folder was (called media) and entered sudo cp -R * /mnt/store cp: cannot create directory `/mnt/store/media': No space left on device It seems like it's not copying over to the new filesystem I made (or thought I did). I've never really done this type of thing until a few days ago so may be running before I can walk... is this not the right way to copy files across? I've only used windows before so the idea of mountpoints is a bit mind boggling. I'm using XBMCbuntu 12 beta 2.0 which is based on 12.04. Will retry with normal Ubuntu 12.04 desktop to see if that's the problem. thanks for the help!

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  • Frequent grub rescue error: unknown filesystem

    - by user3215
    It's really frustrating. Three week's back story: I faced the following error on ubuntu 10.04 LTS Desktop, error : unknown filesystem grub rescue> I tried many solutions online apart from 1 and 2 and eventually I could not boot my system at all. Trying those solutions could not completely fix it and then I had to face initramfs(could not remember exact error). As I could not fix, a week back I did a fresh install of Ubuntu 12.04 Desktop and after a week i.e, now, I got the same grub rescue> error. Could anybody tell me what's the reason behind this error?. Is there any problem with the Ubuntu or it's a problem at my side due to some reason?. My machine description: I have two hard disks, windows is installed on one hard disk and on another it's Ubuntu. I installed the operating systems(vista, ubuntu) such a way one is not known to another, I mean to say, I'll unplug one hard disk and install the Ubuntu and similarly I'll unplug the ubuntu hard disk, installed the vista on another hard disk, generally I do(I actually don't want to run into grub/boot.ini issues installing OSs connecting both the hard disks). When ever I power on the computer windows will boot by default, and I'll generally boot to ubuntu by pressing F8 and selecting the ubuntu hard disk. Any help is greatly appreciated!. Thank you!

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  • Ubuntu impossible to install: "unable to find a medium containing a live filesystem"

    - by Lorenzo
    Yes, I have read questions and answers with similar titles for this issue, which prevented me from installing Ubuntu for several MONTHS now, trying to figure it out. I have a MacBookPro with triple partition (one for Mac Snow Leopard, one for Windows 7, one for Linux) created with reFIT firmware (not BootCamp). I set up the system according to these instructions for reFIT: http://lifehacker.com/5531037/how-to-triple+boot-your-mac-with-windows-and-linux-no-boot-camp-required Now. There is a free partition ready to accept Linux into its arms, but Linux does not want to participate. Most answers to the issue "unable to find a medium containing a live filesystem" point to changing the BIOS booting system (which I don't know how to do, especially using this reFIT booting system), and to changing the socket of the USB (which does not concern me, since I am using a CD, actually I tried with a CD, then with a DVD, since a blank CD is only 700MB while the iso image file of Ubuntu is about 731MB). Anyway. This is what happens: I am in the Mac system (using the Mac partition) I insert the DVD with the burned image of Ubuntu (yes I have tried burning it again and agin on both CD and DVD blank discs). I restart the computer. When reFIT loads, I hold down the ALT key until the CD image appears. I select it, and hit Enter. A small Ubuntu icon appears at the bottom of the screen. Then a Ubuntu sign appears in the middle of the screen with small dots underneath, lighting up progressively over and over to indicate it's loading. Then everything turns black and the following message appears, at the end of a few lines of text: "unable to find medium with live file system". Please provide very practical suggestions on what to do to an unexperienced wannabe Ubuntu very patient user. Please start by saying how do I access the BIOS setup from reFIT bootup, and exactly what and why I need to try and change. (Will this mess up my reFIT bootup?) And anything else I need to do to finally be able to install Ubuntu. Thanks

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  • Unknown filesystem with GRUB rescue caption cannot boot

    - by Dom
    I just recently partitioned my hard drive and I got this error when booting Ubuntu on that drive. unknown filesystem followed by the GRUB rescue terminal. I did some research and tried to download super grub disk but I cant seem to fix it with that. I have two hard disks. One with Windows Vista on it and the other with Ubuntu which is the one I partitioned. There was 100 GB reserved for all the Ubuntu partitions that I needed and the rest was split into two partitions, one for backup folders for my Windows machine and the other for music production which is the one that I created. The space used to created that was shrunk from my backup partition so I didn't mess with any of the Ubuntu partitions. As of now there are a total of 5 partitions. I also downloaded Rescatux which is another Super GRUB Disk for GRUB 2 not knowing which grub I had. It still didn't work. In Super Grub Disk I tried to swap the hard disk because that was what was said to do in order to fix the grub, that didn't work it said it was unsuccessful. I even tried to unplug the Windows hard disk and run Super GRUB Disk and that wasn't successful either. Is there another way I can fix this? Please any help would be greatly appreciated. I would like to have a nice step by step response.

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  • GNOME session not starting after filesystem corruption

    - by user3215
    I'm running Ubuntu 9.10 desktop edition. Suddenly today /home became corrupted and I was prompted to run fsck manually. I ran fsck -y /home and rebooted the system. The system booted but I got no GUI interface (GNOME session) but a black screen with a user prompt instead. Any tricks here to start my system normally? Any help is greatly appreciated. EDIT:1 The error were similar to the the following(may be with some mistakes as I had to type it manually): machine1 login: root password: at login Sun Jan 16 15:30:46 IST 2011 on tty1 EXT3-fs error (devie sda1): ext3_lookup :deleted inode referenced aborting journal on device sda1 Remounting filesystem read-only root@machine1:~# startx ktemp: failed to create file via template `/tmp/serverauth.xxxxxxxxxxx: Read-only file /usr/bin/startx: line 157: cannot create temp file for here-document: Read-only file xauth: error in locking authority file /root/.Xauthority /usr/bin/startx: line 173: cannnot create temp file for here-document: Read-only file xauth: error in locking authority file /root/.Xauthority /usr/bin/startx: line 173: cannnot create temp file for here-document: Read-only file X: cannot stat /tmp/.x11-unix (No such file or directory), aborting giving up. xinit: No such file or directory (errno 2): unable to connect to xserver xinit: No such process (errno 3): Server error xauth: error in locking authority file /root/.Xauthority

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  • "The volume filesystem root has only..."

    - by jcslzr
    I am having this problem in ubuntu 12.04, but I fin strange that when I go to /tmp it wont allow me to delete some files, with message "Operation not permitted" or "this file could not be handled because you dont have permissions to read it". It is only a PC and I have the root password. I was trying to get at least 2000 MB of free space on the root file system to upgrade to 12.10 and see if that resolved the problem. Currently free space on root file system is 190 MB. This is my output: root@jcsalazar-Vostro-3550:~# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/sda6 7688360 7112824 184984 98% / udev 2009288 4 2009284 1% /dev tmpfs 806636 1024 805612 1% /run none 5120 0 5120 0% /run/lock none 2016584 5316 2011268 1% /run/shm /dev/sda5 472036 255920 191745 58% /boot /dev/sda7 30758848 7085480 22110900 25% /home root@jcsalazar-Vostro-3550:~# sudo parted -l Model: ATA TOSHIBA MK3261GS (scsi) Disk /dev/sda: 320GB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 1049kB 106MB 105MB primary fat16 2 106MB 15.8GB 15.7GB primary ntfs boot 3 15.8GB 278GB 262GB primary ntfs 4 278GB 320GB 41.9GB extended 5 278GB 279GB 499MB logical ext4 6 279GB 287GB 7999MB logical ext4 7 287GB 319GB 32.0GB logical ext4 8 319GB 320GB 1443MB logical linux-swap(v1) I apprecciate any new ideas that can help me. Thnx Carlos

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  • Ubuntu 12.04 still slow at mounting internal filesystem

    - by Matthew Goson
    I'm using Toshiba laptop with this configuration: - CPU: Core i5, 2.4GHz - RAM: 4GB - Graphics card: Intel - Hard disk: 500GB SATA I installed Ubuntu 12.04 64bit and got the same issue with this guy Very slow boot due to mounting filesytem, I tried all suggestions there but the slow boot issue still here. Here's a part of my dmesg: [ 2.041015] usbhid: USB HID core driver [ 2.101378] usb 1-1.6: new full-speed USB device number 5 using ehci_hcd [ 2.137980] atl1c 0000:04:00.0: version 1.0.1.0-NAPI [ 2.779080] EXT4-fs (sda2): mounted filesystem with ordered data mode. Opts: (null) [ 22.822597] udevd[381]: starting version 175 [ 22.837954] ADDRCONF(NETDEV_UP): eth0: link is not ready [ 22.850837] lp: driver loaded but no devices found [ 23.003822] Adding 7079096k swap on /dev/sda7. Priority:-1 extents:1 across:7079096k [ 23.407915] mei: module is from the staging directory, the quality is unknown, you have been warned. [ 23.408153] mei 0000:00:16.0: PCI->APIC IRQ transform: INT A -> IRQ 16 [ 23.408160] mei 0000:00:16.0: setting latency timer to 64 [ 23.408211] mei 0000:00:16.0: irq 44 for MSI/MSI-X [ 23.433196] [drm] Initialized drm 1.1.0 20060810 Additional information: my sda1 is a primary NTFS partition, sda2 is a primary ext4 partition which I installed Ubuntu onto. Other partitions are inside an extended partition.

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  • How to automatically mount hibernated NTFS to read-only?

    - by Piotr
    Is there any way to set up Ubuntu this way: If I can't mount the filesystem in rw mode, then mount it in ro mode in the same directory. In result I should not come across the notification that the system can't mount the filesystem (Skip or manual fix notification). SO when I start the system I should have my ntfs partitions mounted either in rw or ro mode depends if the windows is hibernated. fstab entry: #/dev/sda7 UUID=D0B43178B43161E0 /media/Dane ntfs defaults,errors=remount-ro 0 1 "mount -a" result: The disk contains an unclean file system (0, 0). Metadata kept in Windows cache, refused to mount. Failed to mount '/dev/sda7': Operation not permitted The NTFS partition is in an unsafe state. Please resume and shutdown Windows fully (no hibernation or fast restarting), or mount the volume read-only with the 'ro' mount option. I have ubuntu 13.10 and win8. I use uefi secure boot.

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  • How to implement generic callbacks in C++

    - by Kylotan
    Forgive my ignorance in asking this basic question but I've become so used to using Python where this sort of thing is trivial that I've completely forgotten how I would attempt this in C++. I want to be able to pass a callback to a function that performs a slow process in the background, and have it called later when the process is complete. This callback could be a free function, a static function, or a member function. I'd also like to be able to inject some arbitrary arguments in there for context. (ie. Implementing a very poor man's coroutine, in a way.) On top of that, this function will always take a std::string, which is the output of the process. I don't mind if the position of this argument in the final callback parameter list is fixed. I get the feeling that the answer will involve boost::bind and boost::function but I can't work out the precise invocations that would be necessary in order to create arbitrary callables (while currying them to just take a single string), store them in the background process, and invoke the callable correctly with the string parameter.

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  • Grub Rescue Unknown Filesystem Error. Grub Corrupted or Filesystem?

    - by nightcrawler
    Now it has happened twice & have been pulling my hairs now... I have installed xubuntu on my external hardisk & have been using it for about 3 months. It has three partitions, one of 500 mb mounted at /boot, 2nd one of 48gb mounted at / & the rest (out of 160gb) is ntfs partition....used as normal external storage. The last storage supposedly acts as a buffer b/w Linux distributions & Win platform, buffer in the sense that it provides a universal channel for data transfers. I have constantly used this external hardisk for data transfers b/w win7 laptop & xubuntu (on this external hd) without any hassle. However, on of my desktops where I have ubuntu I (for the first time) attached this external drive which let me do data transfers where all three partitions properly mounted....but then nasty thing occurred the same that occurred before. I (as usual) tried booting via this external hd (one having xubuntu, one having being formerly used under Ubuntu) I got error Now I am totally devastated because similar thing happened ~6months before when I had fedora 17 in my external hd (instead of xubuntu) & after it was used under ubuntu the same happened...i didn't reported it because I already had planned towards debian instead of rpm! The mystery is that as long as I don't attach this external hd under ubuntu the data never** corrupts whereas under win xp/7 I can use it as a normal usb storage of coarse linux partitions aren’t available under win platforms... **From corrupts I mean hd fails to boot with the error mentioned however cant say whether data within remains untouched? It seems that my grub & or MBR is corrupted. Please sir guide me to solve this issue also why I cant attach & use linux external hds under linux platform Disk /dev/sdc: 160.0 GB, 160041884672 bytes 255 heads, 63 sectors/track, 19457 cylinders, total 312581806 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: 0x0004e7d0 Device Boot Start End Blocks Id System /dev/sdc1 * 2048 976895 487424 83 Linux /dev/sdc2 978942 96874495 47947777 5 Extended /dev/sdc3 96874496 312575999 107850752 7 HPFS/NTFS/exFAT /dev/sdc5 978944 94726143 46873600 83 Linux /dev/sdc6 94728192 96874495 1073152 82 Linux swap / Solaris I can recall for sure that have seen a thread here when a similar problem occurred & in response someone gave solution of how to mount (now invisible) partitions & recover important data in them. I have misplaced that URL so if any can guide me thither because my important documents resides in / partition What I already have done: Without success I have tried this & related solutions What I plan to do: I believe that filesystem has corrupted & would you recommend solution like this provided I cant recall whether my /boot (500mb) partition was ext4 or ext2 though I am sure that my / (48gb) partition was ext4 UPDATE 1 Attached my external hd under Ubuntu ran followinf command as root grub-install /dev/sdc where /dev/sdc was my external hd containing corrupted xubuntu....it reported all done! I re-ran fdisk -l but to my disappointment it reported Disk /dev/sdc: 160.0 GB, 160041884672 bytes 255 heads, 63 sectors/track, 19457 cylinders, total 312581806 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: 0x1b6b9167 Disk /dev/sdc doesn't contain a valid partition table ...& now I can't even access its ntfs partition (former /dev/sdc3) please help? UPDATE 2 TestDisk (by cgsecurity) failed at founding any partition table :( TestDisk 6.13, Data Recovery Utility, November 2011 Christophe GRENIER <[email protected]> http://www.cgsecurity.org Disk /dev/sdc - 160 GB / 149 GiB - CHS 19457 255 63 Partition Start End Size in sectors

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  • Containers of reference_wrappers (comparison operators required?)

    - by kloffy
    If you use stl containers together with reference_wrappers of POD types, the following code works just fine: int i = 3; std::vector< boost::reference_wrapper<int> > is; is.push_back(boost::ref(i)); std::cout << (std::find(is.begin(),is.end(),i)!=is.end()) << std::endl; However, if you use non-POD types such as (contrived example): struct Integer { int value; bool operator==(const Integer& rhs) const { return value==rhs.value; } bool operator!=(const Integer& rhs) const { return !(*this == rhs); } }; It doesn't suffice to declare those comparison operators, instead you have to declare: bool operator==(const boost::reference_wrapper<Integer>& lhs, const Integer& rhs) { return boost::unwrap_ref(lhs)==rhs; } And possibly also: bool operator==(const Integer& lhs, const boost::reference_wrapper<Integer>& rhs) { return lhs==boost::unwrap_ref(rhs); } In order to get the equivalent code to work: Integer j = { 0 }; std::vector< boost::reference_wrapper<Integer> > js; js.push_back(boost::ref(j)); std::cout << (std::find(js.begin(),js.end(),j)!=js.end()) << std::endl; Now, I'm wondering if this is really the way it's meant to be done, since it seems impractical. It just seems there should be a simpler solution, e.g. templates: template<class T> bool operator==(const boost::reference_wrapper<T>& lhs, const T& rhs) { return boost::unwrap_ref(lhs)==rhs; } template<class T> bool operator==(const T& lhs, const boost::reference_wrapper<T>& rhs) { return lhs==boost::unwrap_ref(rhs); } There's probably a good reason why reference_wrapper behaves the way it does (possibly to accomodate non-POD types without comparison operators?). Maybe there already is an elegant solution and I just haven't found it.

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  • Using time facets on universal_time

    - by scooterman
    Hi all, on boost, to create a time facet to format an specified time we use the folowing: boost::local_time::local_time_facet* facet = new boost::local_time::local_time_facet("%Y%m%d %H:%M:%S.%f"); std::stringstream date_stream; date_stream.imbue(std::locale(date_stream.getloc(), facet)); date_stream << boost::local_time::local_microsec_clock::local_time(boost::local_time::time_zone_ptr()); How do I do the same thing, but using an universal clock: boost::posix_time::microsec_clock::universal_time() Thanks

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  • how a thread can signal when it's finished?

    - by Kyle
    #include <iostream> #include <boost/thread.hpp> using std::endl; using std::cout; using namespace boost; mutex running_mutex; struct dostuff { volatile bool running; dostuff() : running(true) {} void operator()(int x) { cout << "dostuff beginning " << x << endl; this_thread::sleep(posix_time::seconds(2)); cout << "dostuff is done doing stuff" << endl; mutex::scoped_lock running_lock(running_mutex); running = false; } }; bool is_running(dostuff& doer) { mutex::scoped_lock running_lock(running_mutex); return doer.running; } int main() { cout << "Begin.." << endl; dostuff doer; thread t(doer, 4); if (is_running(doer)) cout << "Cool, it's running.\n"; this_thread::sleep(posix_time::seconds(3)); if (!is_running(doer)) cout << "Cool, it's done now.\n"; else cout << "still running? why\n"; // This happens! :( return 0; } Why is the output of the above program: Begin.. Cool, it's running. dostuff beginning 4 dostuff is done doing stuff still running? why How can dostuff correctly flag when it is done? I do not want to sit around waiting for it, I just want to be notified when it's done.

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  • "corrupted filesystem tarfile - corrupted package archive" error

    - by Justin
    I was trying to install a program and it said that my dependencies were unmet, and that I should run, sudo apt-get -f install. I have moved everything I didn't need in /etc/apt/sources.list.d/ into the trash. My source.list is all Natty while I am running Oneiric. So maybe I need a new source.list? But here are the things I have: justin@justin-000:~$ sudo apt-get -f install [sudo] password for justin: Reading package lists... Done Building dependency tree Reading state information... Done Correcting dependencies... Done The following extra packages will be installed: linux-image-3.0.0-13-generic Suggested packages: fdutils linux-doc-3.0.0 linux-source-3.0.0 linux-tools The following NEW packages will be installed: linux-image-3.0.0-13-generic 0 upgraded, 1 newly installed, 0 to remove and 3 not upgraded. 2 not fully installed or removed. Need to get 0 B/36.5 MB of archives. After this operation, 117 MB of additional disk space will be used. Do you want to continue [Y/n]? y (Reading database ... 270736 files and directories currently installed.) Unpacking linux-image-3.0.0-13-generic (from .../linux-image-3.0.0-13- generic_3.0.0-13.22_i386.deb) ... Done. dpkg: error processing /var/cache/apt/archives/linux-image-3.0.0-13 generic_3.0.0-13.22_i386.deb (--unpack): corrupted filesystem tarfile - corrupted package archive No apport report written because MaxReports is reached already dpkg-deb: error: subprocess paste was killed by signal (Broken pipe) Examining /etc/kernel/postrm.d . run-parts: executing /etc/kernel/postrm.d/initramfs-tools 3.0.0-13-generic /boot/vmlinuz-3.0.0-13-generic run-parts: executing /etc/kernel/postrm.d/zz-extlinux 3.0.0-13-generic /boot/vmlinuz-3.0.0-13-generic P: Checking for EXTLINUX directory... found. P: Writing config for /boot/vmlinuz-3.0.0-12-generic... P: Writing config for /boot/vmlinuz-2.6.38-11-generic... P: Installing debian theme... done. run-parts: executing /etc/kernel/postrm.d/zz-update-grub 3.0.0-13-generic /boot/vmlinuz-3.0.0-13-generic Errors were encountered while processing: /var/cache/apt/archives/linux-image-3.0.0-13-generic_3.0.0-13.22_i386.deb E: Sub-process /usr/bin/dpkg returned an error code (1) justin@justin-000:~$ sudo apt-get update justin@justin-000:~$ sudo apt-get update Ign dl.google.com stable InRelease Ign dl.google.com stable InRelease Get:1dl.google.com stable Release.gpg [198 B] Ign us.archive.ubuntu.com oneiric InRelease Ign us.archive.ubuntu.com oneiric-security InRelease Ign http://us.archive.ubuntu.com oneiric-updates InRelease Get:2 dl.google.com stable Release.gpg [198 B] Get:3 dl.google.com stable Release [1,347 B] Get:4 dl.google.com stable Release [1,338 B] Hit us.archive.ubuntu.com oneiric Release.gpg Hit us.archive.ubuntu.com oneiric-security Release.gpg Get:5/dl.google.com stable/main i386 Packages [1,220 B] Hit tp://us.archive.ubuntu.com oneiric-updates Release.gpg Ign tp://dl.google.com stable/main TranslationIndex Get:6 tp://dl.google.com stable/main i386 Packages [464 B] Ign ttp://ppa.launchpad.net oneiric InRelease Hit ttp://us.archive.ubuntu.com oneiric Release Ign ttp://ppa.launchpad.net oneiric InRelease Ign ttp://dl.google.com stable/main TranslationIndex Hit ttp://ppa.launchpad.net oneiric Release.gpg Hit ttp://us.archive.ubuntu.com oneiric-security Release Hit ttp://ppa.launchpad.net oneiric Release.gpg Hit ttp://us.archive.ubuntu.com oneiric-updates Release Hit ttp://us.archive.ubuntu.com oneiric/main Sources Hit ttp://us.archive.ubuntu.com oneiric/restricted Sources Hit ttp://us.archive.ubuntu.com oneiric/universe Sources Hit ttp://us.archive.ubuntu.com oneiric/multiverse Sources Hit ttp://us.archive.ubuntu.com oneiric/main i386 Packages Hit ttp://ppa.launchpad.net oneiric Release Hit ttp://us.archive.ubuntu.com oneiric/restricted i386 Packages Hit ttp://us.archive.ubuntu.com oneiric/universe i386 Packages Hit ttp://us.archive.ubuntu.com oneiric/multiverse i386 Packages Hit ttp://us.archive.ubuntu.com oneiric/main TranslationIndex Hit ttp://us.archive.ubuntu.com oneiric/multiverse TranslationIndex Hit ://us.archive.ubuntu.com oneiric/restricted TranslationIndex Hit htp://us.archive.ubuntu.com oneiric/universe TranslationIndex Hit htp://us.archive.ubuntu.com oneiric-security/main Sources Hit ttp://us.archive.ubuntu.com oneiric-security/restricted Sources Hit ttp://ppa.launchpad.net oneiric Release Hit ttp://us.archive.ubuntu.com oneiric-security/universe Sources Hit tp://us.archive.ubuntu.com oneiric-security/multiverse Sources Hit htp://us.archive.ubuntu.com oneiric-security/main i386 Packages Hit tp://us.archive.ubuntu.com oneiric-security/restricted i386 Packages Hit ttp://us.archive.ubuntu.com oneiric-security/universe i386 Packages Hit ttp://us.archive.ubuntu.com oneiric-security/multiverse i386 Packages Hit htp://ppa.launchpad.net oneiric/main Sources Hit ttp://ppa.launchpad.net oneiric/main i386 Packages Ign htp://ppa.launchpad.net oneiric/main TranslationIndex Hit ttp://us.archive.ubuntu.com oneiric-security/main TranslationIndex Hit ttp://us.archive.ubuntu.com oneiric-security/multiverse TranslationIndex Hit htp://us.archive.ubuntu.com oneiric-security/restricted TranslationIndex Hit htp://us.archive.ubuntu.com oneiric-security/universe TranslationIndex Ign htp://dl.google.com stable/main Translation-en_US Hit htp://us.archive.ubuntu.com oneiric-updates/main Sources Hit htp://us.archive.ubuntu.com oneiric-updates/restricted Sources Hit tp://us.archive.ubuntu.com oneiric-updates/universe Sources Hit htp://us.archive.ubuntu.com oneiric-updates/multiverse Sources Hit htp://us.archive.ubuntu.com oneiric-updates/main i386 Packages Ign htp://dl.google.com stable/main Translation-en Hit ttp://ppa.launchpad.net oneiric/main Sources Hit htp://ppa.launchpad.net oneiric/main i386 Packages Hit ttp://us.archive.ubuntu.com oneiric-updates/restricted i386 Packages Ign htp://dl.google.com stable/main Translation-en_US Ign htp://ppa.launchpad.net oneiric/main TranslationIndex Hit hp://us.archive.ubuntu.com oneiric-updates/universe i386 Packages Hit ttp://us.archive.ubuntu.com oneiric-updates/multiverse i386 Packages Hit htp://us.archive.ubuntu.com oneiric-updates/main TranslationIndex Hit htp://us.archive.ubuntu.com oneiric-updates/multiverse TranslationIndex Hit htp://us.archive.ubuntu.com oneiric-updates/restricted TranslationIndex Ign htp://dl.google.com stable/main Translation-en Hit htp://us.archive.ubuntu.com oneiric-updates/universe TranslationIndex Hit ttp://us.archive.ubuntu.com oneiric/main Translation-en Hit ttp://us.archive.ubuntu.com oneiric/multiverse Translation-en Hit htp://us.archive.ubuntu.com oneiric/restricted Translation-en Hit htp://us.archive.ubuntu.com oneiric/universe Translation-en Hit htp://us.archive.ubuntu.com oneiric-security/main Translation-en Hit hp://us.archive.ubuntu.com oneiric-security/multiverse Translation-en Hit htp://us.archive.ubuntu.com oneiric-security/restricted Translation-en Hit htp://us.archive.ubuntu.com oneiric-security/universe Translation-en Hit htp://us.archive.ubuntu.com oneiric-updates/main Translation-en Hit htp://us.archive.ubuntu.com oneiric-updates/multiverse Translation-en Hit htp://us.archive.ubuntu.com oneiric-updates/restricted Translation-en Hit htp://us.archive.ubuntu.com oneiric-updates/universe Translation-en Ign htp://ppa.launchpad.net oneiric/main Translation-en_US Ign htt://ppa.launchpad.net oneiric/main Translation-en Ign htp://ppa.launchpad.net oneiric/main Translation-en_US Ign htp://ppa.launchpad.net oneiric/main Translation-en Fetched 4,765 B in 2s (2,158 B/s) Reading package lists... Done justin@justin-000:~$

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  • Best boost to productivity : SSD or second screen ?

    - by jfoucher
    Within the same budget, which do you think would be the best boost to productivity for general web development : An SSD as boot drive, or a second screen ? I currently use a 16.4" laptop with full HD screen and 7200 RPM HDD Thanks EDIT: In light of the answers so far, I add that I work at home and while I have a home office with a proper desk, I'm just as often coding sitting on the sofa in the living room.

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