similar to: ARC, mmap, pagecache...

Would it be worthwhile to implement heuristics to auto-tune ''recordsize'', or would that not be worth the effort? -- Regards, Jeremy

A couple of months ago I reported some problems with a batch of Tyan K8SSA (S3870) based machines. We are continuing to have an odd problem with these boxes, and if anyone has seen something similar elsewhere, I'd appreciate hearing about it. These boxes are running Centos 4.4 x86_64 with kernel 2.6.9-42.0.3.ELsmp. They are dual Opteron 265's (dual core) with 4x2GB DIMM's. The

Hi all, This is not really a libvirt issue but I'm hoping some of the smart folks here will know more about this problem... We have noticed when running some HPC applications on our OpenStack (libvirt+KVM) cloud that the same application occasionally performs much worse (4-5x slowdown) than normal. We can reproduce this quite easily by filling pagecache (i.e. dd-ing a single large file to

Folks, We are in the process of purchasing new san/s that our mail server runs on (JES3). We have moved our mailstores to zfs and continue to have checksum errors -- they are corrected but this improves on the ufs inode errors that require system shutdown and fsck. So, I am recommending that we buy small jbods, do raidz2 and let zfs handle the raiding of these boxes. As we need more

I''m working with a Cyrus IMAP server running on a T2000 box under Solaris 10 10/09 with current patches. Mailboxes reside on six ZFS filesystems, each containing about 200 gigabytes of data. These are part of a single zpool built on four Iscsi devices from our Netapp filer. One of these ZFS filesystems contains a number of global and per-user databases in addition to one sixth of the

The time has come to review the current Contributor and Core contributor grants for ZFS. Since all of the ZFS core contributors grants are set to expire on 02-24-2009 we need to renew the members that are still contributing at core contributor levels. We should also add some new members to both Contributor and Core contributor levels. First the current list of Core contributors: Bill

Is ZFS efficient at handling huge populations of tiny-to-small files - for example, 20 million TIFF images in a collection, each between 5 and 500k in size? I am asking because I could have sworn that I read somewhere that it isn''t, but I can''t find the reference. Thanks, Brian -- - Brian Gupta http://opensolaris.org/os/project/nycosug/

This problem is found in meego testing: http://bugs.meego.com/show_bug.cgi?id=6672 A file in btrfs is mmaped and the mmaped buffer is passed to pwrite to write to the same page of the same file. In btrfs_file_aio_write(), the pages is locked by prepare_pages(). So when btrfs_copy_from_user() is called, page fault happens and the same page needs to be locked again in filemap_fault(). The fix is to

Running an mmap-intensive workload on ZFS on a X4500, Solaris 10 11/06 (update 3). All file IO is mmap(file), read memory segment, unmap, close. Tweaked the arc size down via mdb to 1GB. I used that value because c_min was also 1GB, and I was not sure if c_max could be larger than c_min....Anyway, I set c_max to 1GB. After a workload run....: > arc::print -tad { . . . ffffffffc02e29e8

On Nov 22, 2005, at 17:18, Reid Spencer wrote: > Your patch uses an operating system call that is not portable. All > non-portable code needs to be located in the lib/System library. Yep! I know. That is why I posted it for discussion. I'm not sure if this is the "right" way to fix the problem, or if there is a different fix that should be applied (like perhaps copying the

My understanding is that if I "zfs set checksum=<different>" to change the algorithm that this will change the checksum algorithm for all FUTURE data blocks written, but does not in any way change the checksum for previously written data blocks. I need to corroborate this understanding. Could someone please point me to a document that states this? I have searched and searched

I would like to profile heap usage on a per thread basis in a large application process. To do this I am tracking calls to malloc and free with the attached script. Everything seems to look OK with some simple test programmes, however, when I track the live system, the results suggest that one thread has grown by approximately 1Gb and I would be surprised if this was true because I ran pmap -x on

Hi all, I tried to compile the theora source with VS2005. But it asked for the ogg library. error message is as follow. **************************************************************************** Error 1 fatal error C1083: Cannot open include file: 'ogg/ogg.h': No such file or directory c:\Documents and Settings\Manoj\Desktop\libtheora-1.0beta3\include\theora\codec.h 64 Error

hello sir, in llvm installation ./configure command worked properly but while giving make -j 4 command in ubuntu everything got build properly but at last it showed error as llvm[4]: Linking Debug+Asserts executable clang collect2: ld terminated with signal 9 [Killed] make[4]: *** [/home/manoj/Desktop/LLVM/ build/Debug+Asserts/bin/clang] Error 1 make[4]: Leaving directory

hello sir, ./configure worked properly but while giving make -j 2 command in ubuntu everything got build properly but at last it showed error as llvm[4]: Linking Debug+Asserts executable clang collect2: ld terminated with signal 9 [Killed] make[4]: *** [/home/manoj/Desktop/LLVM/ build/Debug+Asserts/bin/clang] Error 1 make[4]: Leaving directory

hello sir, ./configure worked properly but while giving make -j 2 command in ubuntu everything got build properly but at last it showed error as llvm[4]: Linking Debug+Asserts executable clang collect2: ld terminated with signal 9 [Killed] make[4]: *** [/home/manoj/Desktop/LLVM/build/Debug+Asserts/bin/clang] Error 1 make[4]: Leaving directory `/home/manoj/Desktop/LLVM/

You should use make -j with a number lower than 4, it looks like you ran out of memory when linking. On 10 February 2013 15:41, Manoj C <manoj.chinthala at gmail.com> wrote: > hello sir, > in llvm installation ./configure command worked properly but while > giving > make -j 4 command in ubuntu > > everything got build properly but at last it showed error as > >

Evan Jones wrote: > I am pretty certain that this has nothing to do with the C++ library, > and everything to do with the behaviour of mmap when the file that was > mmaped is modified. I actually can reproduce this behaviour with the > attached C test case. The program mmaps a file called 'data,' prints the > last byte, truncates the file, then tries to read the last

Hi, I am trying to install CentOS on an Opensolaris Dom0. virt-install fails with an error in virDomainCreateLinux(). Is this a known issue? Am I missing some step? manoj@mowgli:~$ uname -a SunOS mowgli 5.11 snv_101b i86pc i386 i86xpv Solaris manoj@mowgli:~$ pfexec virt-install What is the name of your virtual machine? centos How much RAM should be allocated (in megabytes)? 512 What would

It wouldn''t be proper to start my first post here without congratulations and thanks to the ZFS team for such an impressive piece of work. Anyway, on to my query. I''ve been trying out ZFS, with a particular focus in reducing latency in a specific application. This application has a fair amount of random writing going on in the background (which, of course, ZFS will make