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  • Faking a Single Address Space

    - by dsimcha
    I have a large scientific computing task that parallelizes very well with SMP, but at too fine grained a level to be easily parallelized via explicit message passing. I'd like to parallelize it across address spaces and physical machines. Is it feasible to create a scheduler that would parallelize already multithreaded code across multiple physical computers under the following conditions: The code is already multithreaded and can scale pretty well on SMP configurations. The fact that not all of the threads are running in the same address space or on the same physical machine must be transparent to the program, even if this comes at a significant performance penalty in some use cases. You may assume that all of the physical machines involved are running operating systems and CPU architectures that are binary compatible. Things like locks and atomic operations may be slow (having network latency to deal with and all) but must "just work".

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  • Save NSCache Contents to Disk

    - by Cory Imdieke
    I'm writing an app that needs to keep an in-memory cache of a bunch of objects, but that doesn't get out of hand so I'm planning on using NSCache to store it all. Looks like it will take care of purging and such for me, which is fantastic. I'd also like to persist the cache between launches, so I need to write the cache data to disk. Is there an easy way to save the NSCache contents to a plist or something? Are there perhaps better ways to accomplish this using something other than NSCache? This app will be on the iPhone, so I'll need only classes that are available in iOS 4+ and not just OS X. Thanks!

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  • Writing photos (and other things) to disk and getting them later in iphone

    - by ebabchick
    I'm trying to write an image to disk: NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsPath = [paths objectAtIndex:0]; NSString* savePath = [documentsPath stringByAppendingPathComponent:@"photo"]; BOOL result = [data writeToFile:savePath atomically:YES]; if(result) NSLog(@"Save of photo success!"); Then, later, I try to retrieve for a table view cell image: NSData* getPhoto = [NSData dataWithContentsOfFile:[leaf content]]; UIImage* myImage = [UIImage imageWithData:getPhoto]; cell.imageView.image = myImage; Yes, I checked to make sure the [leaf content] returns the same NSString as savePath. What else could be the problem? [NSData dataWithContentsOfFile:[leaf content]]; returns nil.... Thanks guys

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  • Running python batch file that has a path with SPACE character

    - by prosseek
    The batch file is something like this, I put the python in some directory that has SPACE character in its path. C:\"Documents and Settings"\Administrator\Desktop\bracket\python\python C:\\"Documents and Settings"\\Administrator\\Desktop\\bracket\\[10,20]\\brackettest.py When I run this one, I get this error. C:\Documents and Settings\Administrator\Desktop\bracket\python\python: can't ope n file 'C:\Documents and Settings\\Administrator\\Desktop\\bracket\\[10,20]\\bra ckettest.py': [Errno 2] No such file or directory C:\Documents and Settings\Administrator\Desktop\bracket What might be wrong? Wrapping the path doesn't solve this problem. "C:\\Documents and Settings\\Administrator\\Desktop\\bracket\\[10,20]\\brackettest.py" Are the brackets ('[]') cause of the problem? On Mac, python works well with bracket character.

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  • Improve disk read performance (multiple files) with threading

    - by pablo
    I need to find a method to read a big number of small files (about 300k files) as fast as possible. Reading them sequentially using FileStream and reading the entire file in a single call takes between 170 and 208 seconds (you know, you re-run, disk cache plays its role and time varies). Then I tried using PInvoke with CreateFile/ReadFile and using FILE_FLAG_SEQUENTIAL_SCAN, but I didn't appreciate any changes. I tried with several threads (divide the big set in chunks and have every thread reading its part) and this way I was able to improve speed just a little bit (not even a 5% with every new thread up to 4). Any ideas on how to find the most effective way to do this?

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  • writing structs and classes to disk

    - by Phenom
    The following function writes a struct to a file. int btwrite(short rrn, BTPAGE *page_ptr) { long addr; addr = (long) rrn * (long) PAGESIZE + HEADERSIZE; lseek(btfd, addr, 0); return (write(btfd, page_ptr, PAGESIZE)); } The following is the struct. typedef struct { short keycount; /* number of keys in page */ int key[MAXKEYS]; /* the actual keys */ int value[MAXKEYS]; /* the actual values */ short child[MAXKEYS+1]; /* ptrs to rrns of descendants */ } BTPAGE; What would happen if I changed the struct to a class, would it still work the same? If I added class functions, would the size it takes up on disk increase?

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  • How to specify comma , space unicode value in app.config(C#3.0)

    - by Newbie
    In the app.config file if I use <add key = "FileDelimeter" value ="&#2c;"/> as unicode for COMMA, it is throwing error Invalid character in a decimal number 'c' For SPACE, <add key = "FileDelimeter" value ="&#20;"/> the error is Character'', hex value 0*14 is illegal in xml while <add key = "FileDelimeter" value ="&#09;"/> for "\t" worked. Where is the mistake? Kindly give a generic solution. Thanks

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  • hp dl580 g5 diag error

    - by maruti
    server disk access is slow, and running insight diagnostics reports this error: Error: 640003 DST Error Error: 640006: The Read and/or Write HARD error rate is above threshold This drive has experienced/recorded error conditions reported by diagnosis and requires replacement"

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  • 16GB Usb Flash Drive shows as 16MB and is unusable

    - by Karim
    i have a sandisk Cruzer 16GB usb flash drive but it started to show up as 16MB. and i cant use it , it tells me that i need to format the drive or "Please insert a disk into drive X" does anyone have any recommadation for any software so i can check the flash drive? Edit: i cant format it since the format fails and well the idea is that it shows as 16MB instead of 16GB

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  • Alternatives to Windows-builtin checkdisk utility for NTFS?

    - by t-a-w
    For some reason Windows 7's checkdisk freezes and doesn't move its progress bar forward for over an hour, while the disk is still supposedly active. Now it's possible that if I left it overnight it would finally figure out how to progress, but are there any other programs with similar functionality I could use instead?

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  • When and why would Windows Explorer lock an external hard disk?

    - by Ngu Soon Hui
    I am quite surprised to see that Windows Explorer is locking my external hard disk. Is there any reason why explorer.exe is holding on to my external hard disk? Before I was trying to detach the external hard disk, I was opening a csproj file using Visual Studio 2008. I made sure that I closed down Visual Studio before trying to detach the external hard disk. There was no other active program except Google Chrome, from what I could see, that was running.

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  • 2 SAN disks failing during the same overnight period

    - by Carl
    We have 2 HP Lefthand SAN servers in separate data rooms. Last week each of the SANs had 1 hard disk fail. They were in different positions on the SANs. Both data rooms are very well protected from power issues with UPS. Any ideas of what could have influenced this? Thanks, Carl

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  • Automate Clonezilla

    - by oidfrosty
    Is there a way to automate process to clone a disk with Clonezilla on different hardwares? we need to make it easier as possible for the final user, right now the process is quite complex edit: grammar

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  • How to use Hardware RAID in Ubuntu Server

    - by user2071938
    I have an Adaptec RAID-Controller and created an RAID-1(Mirroring) succesfully. Now I have installed Ubuntu Server 12.04.3. When I type fdisk -l I get this output: bf@fileserver:~$ sudo fdisk -l Disk /dev/sda: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x00000000 Disk /dev/sda doesn't contain a valid partition table Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x00000000 Disk /dev/sdb doesn't contain a valid partition table Disk /dev/sdc: 80.0 GB, 80026361856 bytes 255 heads, 63 sectors/track, 9729 cylinders, total 156301488 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: 0x0004c454 Device Boot Start End Blocks Id System /dev/sdc1 * 2048 499711 248832 83 Linux /dev/sdc2 501758 156301311 77899777 5 Extended /dev/sdc5 501760 156301311 77899776 8e Linux LVM Disk /dev/mapper/fileserver--vg-root: 75.6 GB, 75606523904 bytes 255 heads, 63 sectors/track, 9191 cylinders, total 147668992 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: 0x00000000 Disk /dev/mapper/fileserver--vg-root doesn't contain a valid partition table Disk /dev/mapper/ddf1_Data: 1000.1 GB, 1000065728512 bytes 255 heads, 63 sectors/track, 121584 cylinders, total 1953253376 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x00000000 Disk /dev/mapper/ddf1_Data doesn't contain a valid partition table Disk /dev/mapper/fileserver--vg-swap_1: 4160 MB, 4160749568 bytes 255 heads, 63 sectors/track, 505 cylinders, total 8126464 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: 0x00000000 Disk /dev/mapper/fileserver--vg-swap_1 doesn't contain a valid partition table The 80 GB HDD is for the System The 1000.2 GB HDD should be for my data. But I'm a bit confused becauser there are listed two 1000.2 GB HDDs, due the Hardware RAID shoudln't there be only one HDD vissible to the OS? (I have two 1000.2 GB HDDs in an Raid-1 Array) dmraid gives me bf@fileserver:~$ sudo dmraid -r /dev/sdb: ddf1, ".ddf1_disks", GROUP, ok, 1953253376 sectors, data@ 0 /dev/sda: ddf1, ".ddf1_disks", GROUP, ok, 1953253376 sectors, data@ 0 so It seems to be ok? But how do I partitionate this disks and which one should I mount(sdb or sda?) Hope you can help me thx Florian

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  • Drive Genius says: "Invalid catalog btree reverse link in node" is this fixable?

    - by bencnscp
    No obvious problems with my Mac OS X 10.5 system, but Drive Genius 1.5.1 says: "Invalid catalog btree reverse link in node" when doing a "Verify" The "repair" and "rebuild" options fail. I did some googling, and the consensus as: 1- Drive Genius is slightly better than Disk Warrior 2- This problem is likely not fixable. My assumed solution is that I should do a full backup and re-format.

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  • Why does a hard disk suddenly look to Windows as if it "needs to be formatted"?

    - by pufferfish
    This is more of a theory question, but what are the reason(s) for a disk to suddenly cause Windows to start saying it "needs to be formatted"? It happens to an IDE disk that I have in a cheap external enclosure, and I can usually get most of the data back by using software like recuva. It's now happened to an internal disk I have. I'm not looking for software to fix this (although links would be appreciated), but rather a low-level explanation as to what gets corrupted on the disk.

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  • Not able to Defrag my drive for shrink even using PerfectDisk on Windows 7

    - by Mithun Sasidharan
    I want to partition my c drive which has over 450gb capacity of which hardly 30gb is being used. I deleted the pagefile.sys and also disabled hibernate and cache memory. I then defragmented and consolidated free space using PerfectDisk 12 and also run a boot time defragmented. Now what remains is Metadata files that preventing me from shrinking the volume beyond half the size if disk. Please tell me what to do?????

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  • Image backup with two Macs

    - by Konzepz
    Hi, My setup is as follows: iMac + Ext. HD in the living room A MacBook I want to create a regular weekly backup flow, that will create an image file for the MacBook (the entire disk image), and save it to the ext. HD on the iMac, meaning -- connect via local network and save the file. What's the best practice/application for this? Thank you.

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  • how to see disk details from linux machine with which command?

    - by jennifer
    hi all subject: LINUX - release.5.4- verify disk details from linux with sfdisk -s I can see the disk capacity as the following: sfdisk -s /dev/cciss/c0d0: 143338560 total: 143338560 blocks but how to see also the disk details as disk manufacture ... etc I try the: , but I not get the right info -(: hdparm -i /dev/cciss/c0d0 /dev/cciss/c0d0: HDIO_GET_IDENTITY failed: Inappropriate ioctl for device

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  • Cloning Windows 7 to Another Machine

    - by trobrock
    I am trying to clone a Windows 7 Install from one machine to others, in a computer lab situation. I have used clonezilla to make an image of the machine's harddrive and then attempted to write that image to a second machine's disk. Everything went fine, but when I try to boot Windows 7 on the second machine I get a blue screen flash and then it tries to run the startup repair tool, which runs unsuccessfully. Is there something new with Windows 7 that keeps it from being cloned like this?

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  • Slow Write Speed on ESXi host

    - by Gregg Leventhal
    I have an ESXi 5.0 free host with an internal datastore of 7.2K 5 disk RAID 5 using a PERC 710 mini RAID controller in a Dell Poweredge R620 Server with 32GB Ram and a 12 Core Xeon. I seem to get slow write speeds in the guests so I checked out ESXTOP and I see 15MB/s write speed there on this host, which is comprable to the guests. What could be causing such horrible write speeds? Is RAID 5 really this slow to write??

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