Thread: about shared_buffer and kernel.shmmax
Hi everybody,
shared_buffer maximum limit is ?
I set shared_buffer more than 250G, I got error at startup pg.
------------------------------------------------------------------------
This error usually means that PostgreSQL's request for a shared memory
segment exceeded your kernel's SHMMAX parameter. You can either reduce
the request size or reconfigure the kernel with larger SHMMAX. To reduce
the request size (currently 439371702272 bytes), reduce PostgreSQL's
shared_buffers parameter (currently 52428800) and/or its max_connections
parameter (currently 104).
-------------------------------------------------------------------------
but now
kernel.shmmax = 966367641600
kernel.shmall = 235929600
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Yours sincerely,
Qi Wang
Edgesoft (China) Co.,Ltd
F26th Block B,Zhongli Building,
No.32 Huoju Road,
Hi-Tech Zone,Dalian,China
Zip:116023
Tel:+86-411-84753511
Fax:+86-411-84753577
http://www.edgesoft.cn
mailto:wangqi@edgesoft.cn
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On 06/21/2012 11:38 AM, wangqi wrote:
Hi everybody, shared_buffer maximum limit is ? I set shared_buffer more than 250G, I got error at startup pg.
http://www.postgresql.org/docs/9.1/static/kernel-resources.html#SYSVIPC
http://www.postgresql.org/docs/9.1/static/runtime-config-resource.html
http://wiki.postgresql.org/wiki/Guide_to_reporting_problems
--
Craig Ringer
On 06/20/2012 11:38 PM, wangqi wrote: > shared_buffer maximum limit is ? > I set shared_buffer more than 250G, I got error at startup pg. There's not much evidence that values larger than 16GB are really productive. You really do not want put all their memory in just that one place. -- Greg Smith 2ndQuadrant US greg@2ndQuadrant.com Baltimore, MD PostgreSQL Training, Services, and 24x7 Support www.2ndQuadrant.com