search for: fdsync

Running a PostgreSQL database and trying to understand the bottleneck in my setup. I now know there is a fdsync being issued to a database file. This one takes up to 10 seconds. The problem here is that all the other processes are entering a wait state (this is in postgres itself. The syncing process holds a latch in exclusive mode, that is needed by all others) waiting for this flush to finish. All my 128+...

Hi zfs-discuss, I have some questions about throttling on ZFS 1) I know that throttling is activating while one sync is waiting for another. (http://blogs.sun.com/roller/page/roch?entry=the_dynamics_of_zfs) Is it possible to throttle only selected processes (e.g. nfsd) ? 2) How can I obtain some statistics about it? I want to know how often throttling is activating on my host etc. 3) Is it

...ch process, having 'read' its way through the entire file, then writes 81 (ish) bytes out to the end of the file. These bytes look a bit like a machine trust account name. Here's an extract from the 'truss' output. write(29, "\0\0\018 g k m t x 2 j $".., 81) = 81 fdsync(29, O_RDONLY|O_SYNC) = 0 Repeated 'ls -l' of the file in /var/tmp reveals that it both shrinks and grows over time. >Try running 'smbd -b' to look at the build paths in your binary (I'm >assuming it's one you've built in-house, but it may be...

...s -c -p 13968 ^C syscall seconds calls errors read .649 90816 30265 write .770 57157 open .000 4 close .000 4 time .368 83358 lseek .000 66 *fdsync 2.250 80699* fcntl .268 60530 lwp_park .210 28842 lwp_unpark .198 28842 yield .000 47 pread .025 250 pwrite .857 53880 pollsys .005 603...

...3911414 time() = 1303911414 lstat64("/home/hrz/g033/Mail/test-aus.lock", 0xFFBFED28) Err#2 ENOENT open64("/home/hrz/g033/Mail/test-aus.lock", O_RDWR|O_CREAT|O_EXCL, 0666) = 14 write(14, " 8 8 2 2 : f t p s e r v", 12) = 12 fdsync(14, FDSYNC) = 0 fstat64(14, 0xFFBFEE68) = 0 close(14) = 0 lstat64("/home/hrz/g033/Mail/test-aus.lock", 0xFFBFEFC8) = 0 open64("/home/hrz/g033/Mail/test-aus", O_RDWR) = 14 fstat64(14, 0xFF...

...3 base genunix: [ID 179002 kern.notice] %l0-3: 0000060011f6c828 0000000000000007 000006001c1f20c8 00000000013409d8 Dec 27 04:42:13 base %l4-7: 0000000000000000 0000000000000001 0000000000000000 00000000018bcc00 Dec 27 04:42:13 base genunix: [ID 723222 kern.notice] 000002a10433fa30 genunix:fdsync+40 (7, 10, 0, 184, 10, 30007adda40) Dec 27 04:42:13 base genunix: [ID 179002 kern.notice] %l0-3: 0000000000000000 000000000000f071 00000000f0710000 000000000000f071 Dec 27 04:42:13 base %l4-7: 0000000000000001 000000000180c000 0000000000000000 0000000000000000 Dec 27 04:42:14 base unix: [ID...

I see Intel has released a new tool. Oh, it requires some patches to the kernel to record latency times. Good thing people don''t mind patching their kernels, eh? So who can write the equivalent latencytop.d the fastest? ;-) http://www.latencytop.org/ -- cburgess at qnx.com