| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Siddharth Shah <siddharth(dot)shah(at)elitecore(dot)com>, pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Effect of stopped status collector process |
| Date: | 2008-11-25 14:03:52 |
| Message-ID: | 20081125140352.GD4875@alvh.no-ip.org |
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| Lists: | pgsql-general |
Tom Lane wrote:
> If you are willing to run a hand-hacked version then I'd suggest doing
> your experimentation with CVS HEAD. There are changes in place already
> to reduce the stats file traffic.
Why do we _have_ to write the file to disk? I wonder if it would work
to store the file in a mmaped memory region and have the readers get
data from there. We could have more than one copy, reference-counted so
that they can be removed when the old readers are gone.
Are MAP_SHARED | MAP_ANONYMOUS mmapped regions portable? Linux claims
to support them from 2.4.
--
Alvaro Herrera http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.
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