search for: posix_fallocate

Hi, AIX's implementation of posix_fallocate is a little bit, let me say, peculiar. Attached is a patch to "fix" (=work around) this. Without you'll see this in the logs: Jul 28 01:17:41 trevi mail:err|error dovecot: IMAP(beckerr): posix_fallocate() failed: File exists Jul 28 01:17:41 trevi mail:err|error dovecot: IMAP(bec...

...uld be appended directly after a block of NUL bytes, and be scanned by dovecot as being glued to the preceding message. I traced this to the file extension operation performed in mbox_sync_handle_eof_updates, where the 'file_set_size' call is used. If available, file_set_size will use the posix_fallocate call. In GFS2 posix_fallocate increases the file size in 4 kB chunks (there seems to be no guarantee anyway that posix_allocate will extend a file by the exact size requested). After a successful posix_fallocate call, mbox_sync_handle_eof_updates currently proceeds in rewriting the mailbox startin...

...can.org/getting_started_with_ocaml_on_red_hat_and_fedora -------------- next part -------------- >From 557f413e0bd1ad7bd0180ca28a5bfec854f23790 Mon Sep 17 00:00:00 2001 From: Richard Jones <rjones at redhat.com> Date: Tue, 6 Apr 2010 11:03:03 +0100 Subject: [PATCH] Check error returns from posix_fallocate (RHBZ#579664). posix_fallocate has a non-standard way to return error indications. Thus all our calls to posix_fallocate were effectively unchecked. For example: $ guestfish alloc test.img 1P $ echo $? 0 $ ll test.img -rw-rw-r--. 1 rjones rjones 0 2010-04-06 11:02 test.img $ rm test....

...spike on the server-side. The spike lasts about 20 minutes and uses about 20%-25% of the cpu associated with the rsync instance creating the file. The spike is directly linked to the time it takes to create the file. I compiled rsync using cygwin CVS. I initially suspected the implementation of posix_fallocate in cygwin. I posted the same question to their board and Corinna indicated she can create a 40GB file in a few milliseconds. I'm wondering if there is something else going on at this point. Does anyone else get this issue too? I want to confirm it isn't just a problem with my environm...

...rned off the cehck for mail when starting and check for new mail every N minutes functions, and then check the ps table to make sure there are no imap connections) However, I'm seeing two errmsgs in the maillog on the test machine: > Sep 22 11:54:13 egg mail:err|error dovecot: IMAP(sdean): posix_fallocate() faile > d: Protocol not available > Sep 22 11:54:13 egg mail:err|error dovecot: IMAP(sdean): file_set_size() failed > with mbox file /var/spool/mail/sdean: Protocol not available which appear to happen AFTER mail arrives at the production server....it seems to happen on my test server...

Does FreeBSD have fallocate(2) or equivalent? On Mon, Oct 30, 2017 at 4:32 PM, Ed Maste <emaste at freebsd.org> wrote: > On 23 October 2017 at 18:49, Rui Ueyama via llvm-dev > <llvm-dev at lists.llvm.org> wrote: > >> > >> BTW, posix_fallocate() might provide better portability and decrease the > >> likelihood of falling back on ftruncate(). > > > > Yes, but we want to avoid that function because when it falls back, it is > > very slow. What it does when fallocate(2) is not available is to actually > > wr...

...inGW http://www.annexia.org/fedora_mingw -------------- next part -------------- >From f6df273d53ba46042856ebe6b2c640c9b715a51b Mon Sep 17 00:00:00 2001 From: Richard Jones <rjones at redhat.com> Date: Tue, 24 Nov 2009 16:16:08 +0000 Subject: [PATCH 3/4] daemon: Alternate implementation of posix_fallocate. If the posix_fallocate function is not available [ie. Windows] use an alternate implementation that just loops and writes. --- daemon/configure.ac | 1 + daemon/fallocate.c | 23 ++++++++++++++++++++++- 2 files changed, 23 insertions(+), 1 deletions(-) diff --git a/daemon/configure.ac b/d...

...back the file's size with stat() before mapping? > .st_blocks should give the "real" size. > Creating a sparse file is not an error, and a sparse file works fine as long as your disk has enough space (which is almost always true.) So I don't know how stat helps. > BTW, posix_fallocate() might provide better portability and decrease the > likelihood of falling back on ftruncate(). > Yes, but we want to avoid that function because when it falls back, it is very slow. What it does when fallocate(2) is not available is to actually write 0 to every block to make sure that all...

...system (ext4 or XFS) in a very efficient way which causes the actual writes to be much faster than having to allocate them dynamically. How does a Linux application (Samba) get access to this new extent-based allocation call ? Simple, it's built into glibc on modern Linux distributions via the posix_fallocate() call. In the new patch that has gone into Samba 3.5.7 (and also all future versions of Samba), when the smb.conf parameter: "strict allocate = yes" is set on a share, whenever a file is extended by an SMBwriteX/SMB2_WRITE call, call Samba calls posix_fallocate() to ensure the file ext...

...ke to accomplish is the merging of the .preallocate patch and the .fuzzy option. When these 2 switches are used together (at least on Windows platforms), I want rsync to determine which fuzzy file to use (from the fuzzy_distance() function), but then go ahead and preallocate the new file, not with posix_fallocate(), but with the contents of the file matched from fuzzy_distance(). This would keep the destination file from being severely fragmented. What I see happening is rsync doing a local file copy first, but not block by block. When you copy a file on Windows, with the copy command, the entire file (s...

Wayne.my vote is for a command-line option. I've noticed there is some penalty for very large files (35GB-50GB). The penalty is relatively small based on my 'intuitive' measurements.read me watching without running a real timer. The difference is very small compared to what happens after a few weeks without the fragmentation patch. Our SAN was becoming so fragmented that we were

...66170890192c1fd7d1f3#diff-5ca47c29ae13efa3959b8b28cf4dbd31R112 > line 112 > > The disk size in this case is 40 GB and we currently wait 5 minutes. > > On the ovirt-node there's an ‘fallocate’ process (still) running. > It's taken 23 minutes so far. > This code is using posix_fallocate and it can be very slow on NFS < 4.2, writing one byte to every 4k block. > Because we didn't reach a satisfactory conclusion of the whole > sparse/format business, I am currently setting sparse = False > (format is always raw in my testing): > > > https://github.com/libg...

On Mon, Oct 23, 2017 at 6:40 PM, Andrew Kelley <superjoe30 at gmail.com> wrote: > > > On Mon, Oct 23, 2017 at 9:30 PM, Rui Ueyama <ruiu at google.com> wrote: > >> On Mon, Oct 23, 2017 at 5:28 PM, Andrew Kelley <superjoe30 at gmail.com> >> wrote: >> >>> For Zig we use LLD as a library. So for us it would be better to avoid >>>

I've been running some tests on files created by rsync and noticing fragmentation issues. I started the testing because our 5TB array started performing very slowly and it appears fragmentation was the culprit. The test I conducted was straighforward: 1. Copy over a 49GB file. Analyzed with contig (from sysinternals), no fragments. 2. Ran rsync and the file was recreated normally (rsync

...01 declares this function obsolete; use nanosleep(2) instead. POSIX.1-2008 removes the specification of usleep(). recent rsync 3.1.3 is still using usleep: # grep -r usleep * config.h.in:/* Define to 1 if you have the `usleep' function. */ configure.ac: initgroups utimensat posix_fallocate attropen setvbuf usleep) configure.sh: initgroups utimensat posix_fallocate attropen setvbuf usleep OLDNEWS: - Use usleep() for our msleep() function if it is available. util2.c: usleep(t*1000); for my curiosity, that went into rsync @2014, which is not too long ago: https://git.samba....

Hi, Thank you for pointing me about -xc99 flag, I have compiled and installed dovecot inplace of version 1.0.5 without any special actions on the upgrade. And after starting it immediately got in it's log file messages like: --- dovecot: Oct 16 23:10:18 Error: IMAP(seriv): file_set_size() failed with index cache file /var/spool/imap/seriv/.imap/.git-altlinux-ru/dovecot.index.cache: Invalid

Hi All I was reading through this: http://kashyapc.com/2011/12/02/little-more-disk-io-perf-improvement-with-fallocateing-a-qcow2-disk/ I was basically searching for pointers on improving disk I/O. I wanted to know the purpose of preallocation=full & preallocation=metadata , What is the difference between them ? and which one would yield a better disk I/O speed ? Appreciate your

...ing for getrusage -- Looking for getrusage - found -- Looking for setrlimit -- Looking for setrlimit - found -- Looking for isatty -- Looking for isatty - found -- Looking for futimens -- Looking for futimens - not found -- Looking for futimes -- Looking for futimes - found -- Looking for posix_fallocate -- Looking for posix_fallocate -not found -- Looking for lseek64 -- Looking for lseek64 - not found -- Looking for mallctl -- Looking for mallctl - not found -- Looking for mallinfo -- Looking for mallinfo - not found -- Looking formalloc_zone_statistics -- Looking formalloc_zone_statistic...

...39;test2-full.qcow2', fmt=qcow2 size=1073741824 encryption=off cluster_size=65536 preallocation='full' lazy_refcounts=off refcount_bits=16 $ ls -lash test2-full.qcow2 1.1G -rw-r--r--. 1 root root 1.1G Jun 3 03:31 test2-full.qcow2 (3) 'preallocation=falloc': which uses posix_fallocate() to "allocate blocks and marking them as uninitialized", and is relatively faster than writing out zeroes to a file: $ qemu-img create -f qcow2 -o preallocation=falloc test3-falloc.qcow2 1G Formatting 'test3-falloc.qcow2', fmt=qcow2 size=1073741824 encryption=off...

Hi, I was trying to crosscompile dovecot, but I got some error: --with-notify=inotify don't work, as it try to run a test program to verify if inotify is supported in the building platform. Solved with --with-notify=dnotify. Ihmo, is more a hack than a solution. | checking whether posix_fallocate() works... configure: error: cannot run test program while cross compiling I can't find an a suitable option for this error. Again the problem is that configure can't run an executable for a different platform. It's possible to set a safe default? Thanks in advance. -- Saluti / Re...