New information. When I run CHECKPOINT manually in psql console, effect is fully reproduced. So - it is a checkpoint slowdown.
The quesion is - how to make CHECKPOINT work faster? On 3/27/07, Dmitry Koterov <[EMAIL PROTECTED]> wrote:
How to tune them? 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@sai.msu.su> 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@sai.msu.su, http://www.sai.msu.su/~megera/<http://www.sai.msu.su/%7Emegera/> > 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 [EMAIL PROTECTED] so that your > message can get through to the mailing list cleanly >
