| How to increase SHMMAX for virtual OS? [message #8330] |
Thu, 16 November 2006 08:17  |
Siaco
Messages: 2
Registered: November 2006
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Junior Member |
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Hi.
I'm trying to run PostgreSQL on virtual system and I need to increase SHMMAX to be able to assign a higher than default value for shared_buffers parameter (essential for performance). I've tried to increase 'shmpages' parameter, but I suppose that I did not calculate peges to bytes properly. Or, maybe, do I have to change other parameters too?
Error message during starting postgreSQL with too high shared_buffers value is typical for too low shmmax (in real OS). PostgreSQL cannot start even at shared_buffers set to 4000 (in 8KB pages -> 32 MB). The requested segment size is 36184064.
And here are my kernel settings. Most of them calculated by vzsplit, shmpages changed manually.
Version: 2.5
uid resource held maxheld barrier limit failcnt
110: kmemsize 2074026 4280348 69857006 76842706 0
lockedpages 0 0 3410 3410 0
privvmpages 2107 22409 153494 168843 0
shmpages 0 6794 46184064 46184064 0
dummy 0 0 0 0 0
numproc 19 44 2666 2666 0
physpages 1184 15973 0 9223372036854775807 0
vmguarpages 0 0 153494 9223372036854775807 0
oomguarpages 1184 15973 153494 9223372036854775807 0
numtcpsock 5 6 2666 2666 0
numflock 3 4 1000 1100 0
numpty 0 1 266 266 0
numsiginfo 0 3 1024 1024 0
tcpsndbuf 86880 0 12365733 23285669 0
tcprcvbuf 81920 0 12365733 23285669 0
othersockbuf 35464 49936 6182866 17102802 0
dgramrcvbuf 0 9680 6182866 6182866 0
numothersock 21 32 2666 2666 0
dcachesize 0 0 15246664 15704064 0
numfile 1134 2098 27264 27264 0
dummy 0 0 0 0 0
dummy 0 0 0 0 0
dummy 0 0 0 0 0
numiptent 10 10 200 200 0
Is there a more advanced howto about setting kernel parameters?
R.
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