| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Michael Glaesemann <grzm(at)seespotcode(dot)net> |
| Cc: | Martijn van Oosterhout <kleptog(at)svana(dot)org>, "Bort, Paul" <pbort(at)tmwsystems(dot)com>, Peter Eisentraut <peter_e(at)gmx(dot)net>, Neil Conway <neilc(at)samurai(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: GUC with units, details |
| Date: | 2006-07-27 05:03:38 |
| Message-ID: | 29818.1153976618@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Michael Glaesemann <grzm(at)seespotcode(dot)net> writes:
> I've seen this mentioned a couple of times. I'm not nearly as
> familiar with these settings as I should be, but it seems to me that
> if the memory size *does* need to be a integral multiple of page
> size, e.g., n * page_size = memory_size, why isn't that memory
> configured as the integer n rather than memory_size?
It is. For instance shared_buffers is configured as the number of
buffers. What we're talking about here is ways to specify the intended
usage with other units (eg "I want N megabytes of shared buffers") but
that's not going to magically let you allocate half a shared buffer.
Peter's not said exactly how he plans to deal with this, but I suppose
it'll round off one way or the other ...
regards, tom lane
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