| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | MauMau <maumau307(at)gmail(dot)com> |
| Cc: | Merlin Moncure <mmoncure(at)gmail(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Does RelCache/SysCache shrink except when relations are deleted? |
| Date: | 2011-09-29 12:53:33 |
| Message-ID: | 1317300607-sup-7099@alvh.no-ip.org |
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| Thread: | |
| Lists: | pgsql-hackers |
Excerpts from MauMau's message of jue sep 29 09:23:48 -0300 2011:
> The amount of physical memory is 8GB, which is enough for the workload. I
> asked the customer for the output of "SHOW ALL", but I haven't received it
> yet. However, shared_buffers should be less than 1.6GB because, as I wrote
> in the previous mail, top command showed 1.6GB in "VIRT" column before
> executing somefunc() PL/pgSQL function.
You don't really know this; some operating systems (Linux in particular)
does not show shared memory as in use by a process until it is accessed.
It may very well have well over 1.6 GB of shared_buffers, yet not show
that in VIRT.
--
Álvaro Herrera <alvherre(at)commandprompt(dot)com>
The PostgreSQL Company - Command Prompt, Inc.
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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