Re: [PERFORM] Write-heavy pg_stats_collector on mostly idle server

2011-02-08 Thread Jakub Ouhrabka
Hi Josh, it's "known" issue, see this thread: http://archives.postgresql.org/pgsql-hackers/2010-02/thrd6.php#01290 HTH, Kuba Dne 8.2.2011 2:39, Josh Berkus napsal(a): Ooops. It looks like you are right, see ./src/backend/postmaster/pgstat.c 3c2313f4 (Tom Lane 2008-11-03 01:17:08

Re: [PERFORM] Write-heavy pg_stats_collector on mostly idle server

2011-02-07 Thread Josh Berkus
> Ooops. > It looks like you are right, see ./src/backend/postmaster/pgstat.c > > 3c2313f4 (Tom Lane 2008-11-03 01:17:08 + 2926) > if (last_statwrite < last_statrequest) > 70d75697 (Magnus Hagander2008-08-05 12:09:30 + 2927) > pgstat_write_statsfile(false); This i

Re: [PERFORM] Write-heavy pg_stats_collector on mostly idle server

2011-02-07 Thread Cédric Villemain
2011/2/8 Joshua D. Drake : > On Mon, 2011-02-07 at 14:58 -0800, Josh Berkus wrote: >> >> Anyone seen anything like this before? >> >> >> > >> > it is the expected behavior, IIRC >> >> OK.  It just seems kind of pathological for stats file writing to be 10X >> the volume of data writing.  I see why

Re: [PERFORM] Write-heavy pg_stats_collector on mostly idle server

2011-02-07 Thread Joshua D. Drake
On Mon, 2011-02-07 at 14:58 -0800, Josh Berkus wrote: > >> Anyone seen anything like this before? > >> > > > > it is the expected behavior, IIRC > > OK. It just seems kind of pathological for stats file writing to be 10X > the volume of data writing. I see why it's happening, but I think it's >

Re: [PERFORM] Write-heavy pg_stats_collector on mostly idle server

2011-02-07 Thread Josh Berkus
>> Anyone seen anything like this before? >> > > it is the expected behavior, IIRC OK. It just seems kind of pathological for stats file writing to be 10X the volume of data writing. I see why it's happening, but I think it's something we should fix. -- -- J

Re: [PERFORM] Write-heavy pg_stats_collector on mostly idle server

2011-02-05 Thread Cédric Villemain
2011/2/4 Josh Berkus : > All, > > Seeing an issue which is new on me.  On a mostly idle PostgreSQL server, > the stats collector is rewriting the entire stats file twice per second. > > Version: 8.4.4 > Server: Ubuntu, kernel 2.6.32 > Server set up: ApacheMQ server.  25 databases, each of which hol

[PERFORM] Write-heavy pg_stats_collector on mostly idle server

2011-02-04 Thread Josh Berkus
All, Seeing an issue which is new on me. On a mostly idle PostgreSQL server, the stats collector is rewriting the entire stats file twice per second. Version: 8.4.4 Server: Ubuntu, kernel 2.6.32 Server set up: ApacheMQ server. 25 databases, each of which hold 2-3 tables. Filesystem: Ext4, defau