AIX very slow on SOME commands options ??

[Hugot Christophe]

I need help for 3.2.5 Aix

Here are the symptoms (may be 2 problems but they appeared
simultaneously):

1) Some command options are very slow
time ls -l return real 35 s , sys 0.05 , use 0.05
time ps -eaf return real 35 s, sys & use 0.05
ls without option is ok (like ps witout -f)
some exe file are very slow to load
aso ...

I search the problem with traditionnals commands : ps vg, errpt, vmstat,
sar, lsps aso.. and didn't find anything wrong (nothing in the syslog
either).

I contacted the 2nd level support in France but they are still searching
(I hope).

I traced (using the trace command) and compared between 2 machines ( one
OK & one with the problem) but there are too much results. The only
thing I saw were very more FLIH & SLIH on the bad machine. Could someone
tell me what to trace or where to look, I'm quite loss.

2) The fs which have option mount=true in /etc/filesystems don't mount
at boot time but can bee mounted "by hand" after boot.

Thank you.

[Rick Poleshuck]

Hugot Christophe (pea...@world-net.sct.fr) wrote:
: I need help for 3.2.5 Aix

:
: Here are the symptoms (may be 2 problems but they appeared
: simultaneously):
:
: 1) Some command options are very slow
: time ls -l return real 35 s , sys 0.05 , use 0.05
: time ps -eaf return real 35 s, sys & use 0.05
: ls without option is ok (like ps witout -f)
: some exe file are very slow to load
: aso ...
:
: I search the problem with traditionnals commands : ps vg, errpt, vmstat,
: sar, lsps aso.. and didn't find anything wrong (nothing in the syslog
: either).

:
This problem is symptomatic of a very large passwd file. Are you using NIS?
If you have an inordinatley large passwd file you may have to move to NIS
for performance reasons.

Good luck

--
| Email - pl...@cnj.digex.net
Rick Poleshuck | Voice - (908) 245-1177
| Mail - Rick Poleshuck & Associates
| - 308 Elizabeth Avenue, Cranford, New Jersey 07016

[Valdis Kletnieks]

In article <4judt1$c...@news4.digex.net>, Rick Poleshuck wrote:
>This problem is symptomatic of a very large passwd file. Are you using NIS?
>If you have an inordinatley large passwd file you may have to move to NIS
>for performance reasons.

You may also wish to check out the 'mkpasswd' command, which creates a
hashed file that doesn't require linear search for getpwbyuid() calls. Just
as much a performance win, and doesnt require NIS and all its security leaks...

--
Valdis Kletnieks
Computer Systems Engineer
Virginia Tech

[Michael Abel]

Just an idea:
1.) the commandos you mentioned translate UIDs from
inodes and processed into User names. So a very large
/etc/passwd, a slow NIS server or the like could cause
your problems.

2.) Filesystems declared with "mount=true" are mounted
trought the command "mount all" which is in the
/etc/rc startup file - check for that entry perhaps
it was removed from the file.

Regards,
Michael

In article <316275...@world-net.sct.fr>,
Hugot Christophe writes:

I need help for 3.2.5 Aix

Here are the symptoms (may be 2 problems but they appeared
simultaneously):

1) Some command options are very slow
time ls -l return real 35 s , sys 0.05 , use 0.05
time ps -eaf return real 35 s, sys & use 0.05
ls without option is ok (like ps witout -f)
some exe file are very slow to load
aso ...

I search the problem with traditionnals commands : ps vg, errpt,
vmstat,
sar, lsps aso.. and didn't find anything wrong (nothing in the syslog
either).

I contacted the 2nd level support in France but they are still