Now I have:
checkpoint_segments = 5 # in logfile segments, min 1, 16MB each
checkpoint_timeout = 900 # range 30-3600, in seconds
checkpoint_warning = 30 # in seconds, 0 is off
No checkpoint warnings in pgsql logs.
On 3/27/07, Oleg Bartunov <oleg@xxxxxxxxxx> wrote:
hmm,
looks like checkpoint ?
Check checkpoint settings in postgresql.conf.
Oleg
On Tue, 27 Mar 2007, Dmitry Koterov wrote:
> Hello.
>
> I have found that sometimes heavy loaded PostgreSQL begins to run all the
> queries slower than usual, sometimes - 5 and more times slower. I cannot
> reprocude that, but symptoms are the following: queries work very fast for
> 5-10 minutes, and after that - significant slowdown (every query, even a
> simple one, works 5-10 and ever more times slower), disk write activity
> grows too (but not everytime - I don't know exactli if there is a direct
> correlation). 2-3 seconds, then - performance restores back to normal.
>
> Autovacuum is turned off.
>
> Machine has 2 processors, huge memory, fast SCSI disks.
>
> I understand that there is too less information. Please advice what to
> monitor for better problem discovering.
>
Regards,
Oleg
_____________________________________________________________
Oleg Bartunov, Research Scientist, Head of AstroNet (www.astronet.ru ),
Sternberg Astronomical Institute, Moscow University, Russia
Internet: oleg@xxxxxxxxxx, http://www.sai.msu.su/~megera/
phone: +007(495)939-16-83, +007(495)939-23-83
---------------------------(end of broadcast)---------------------------
TIP 1: if posting/reading through Usenet, please send an appropriate
subscribe-nomail command to majordomo@xxxxxxxxxxxxxx so that your
message can get through to the mailing list cleanly
