FAQ Search Today's Posts Mark Forums Read
» Video Reviews

» Linux Archive

Linux-archive is a website aiming to archive linux email lists and to make them easily accessible for linux users/developers.


» Sponsor

» Partners

» Sponsor

Go Back   Linux Archive > Debian > Debian Kernel

 
 
LinkBack Thread Tools
 
Old 02-25-2009, 07:05 PM
Yaroslav Halchenko
 
Default Bug#517122: libc6: very slow access/open/... syscalls on NFS mounted files

Thank you Aurelien,

I should have RTFM more closely. Also I've ran strace -c which is
claimed to report time spent in kernel...

on that "slow" system it is

% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
43.25 3.322673 10008 332 171 stat
25.46 1.955775 7190 272 28 open
16.58 1.273361 6006 212 162 access
12.25 0.940696 649 1449 1 lstat
1.06 0.081252 16250 5 1 unlink
0.78 0.060004 30002 2 link

whenever on another node (with no problem):

% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
66.35 0.008808 0 18427 read
9.08 0.001206 0 52497 rt_sigprocmask
5.73 0.000761 22 34 clone
3.53 0.000468 1 342 180 stat
3.48 0.000462 0 2354 20 close
3.29 0.000437 0 908 28 open
2.83 0.000376 0 1410 1 lstat
2.45 0.000325 5 68 34 wait4


> reassign 517122 linux-2.6
> retitle 517122 linux-2.6: very slow access/open/... syscalls on NFS mounted files
> thanks

> > whenever on other nodes it takes just 0.0001 or so

> This time is the time the userland (ie libc6) waits before getting an
> answer.

--
Yaroslav Halchenko
Research Assistant, Psychology Department, Rutgers-Newark
Student Ph.D. @ CS Dept. NJIT
Office: (973) 353-1412 | FWD: 82823 | Fax: (973) 353-1171
101 Warren Str, Smith Hall, Rm 4-105, Newark NJ 07102
WWW: http://www.linkedin.com/in/yarik



--
To UNSUBSCRIBE, email to debian-kernel-REQUEST@lists.debian.org
with a subject of "unsubscribe". Trouble? Contact listmaster@lists.debian.org
 
Old 02-28-2009, 04:58 AM
Yaroslav Halchenko
 
Default Bug#517122: libc6: very slow access/open/... syscalls on NFS mounted files

only today (after some good amount of beer) I've detected that slow-down
is not present when programs are ran not within VNC (like in the case
when it was during original filing, vnc was vnc4server
4.1.1+X4.3.0-32 rebuilt locally with nostrip).

So, slow-down is not present when the same command is ran within session
through ssh, but happens when ran within VNC. I have exported the same
environment as in ssh-based session within shell ran within VNC -- no
effect. Restart of VNC server helped... so what could the original
cause be? I will report if the slow down comes back again -- now
everything is running smoothly

On Wed, 25 Feb 2009, Aurelien Jarno wrote:

> reassign 517122 linux-2.6
> retitle 517122 linux-2.6: very slow access/open/... syscalls on NFS mounted files
> thanks
--
Yaroslav Halchenko
Research Assistant, Psychology Department, Rutgers-Newark
Student Ph.D. @ CS Dept. NJIT
Office: (973) 353-1412 | FWD: 82823 | Fax: (973) 353-1171
101 Warren Str, Smith Hall, Rm 4-105, Newark NJ 07102
WWW: http://www.linkedin.com/in/yarik



--
To UNSUBSCRIBE, email to debian-kernel-REQUEST@lists.debian.org
with a subject of "unsubscribe". Trouble? Contact listmaster@lists.debian.org
 

Thread Tools




All times are GMT. The time now is 06:38 PM.

VBulletin, Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO ©2007, Crawlability, Inc.
Copyright 2007 - 2008, www.linux-archive.org