| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Greg Stark <gsstark(at)mit(dot)edu> |
| Cc: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: [PATCHES] ARC Memory Usage analysis |
| Date: | 2004-10-26 05:53:55 |
| Message-ID: | 4887.1098770035@sss.pgh.pa.us |
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| Lists: | pgsql-hackers pgsql-patches pgsql-performance |
Greg Stark <gsstark(at)mit(dot)edu> writes:
> Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> writes:
>> Another issue is what we do with the effective_cache_size value once we
>> have a number we trust. We can't readily change the size of the ARC
>> lists on the fly.
> Huh? I thought effective_cache_size was just used as an factor the cost
> estimation equation.
Today, that is true. Jan is speculating about using it as a parameter
of the ARC cache management algorithm ... and that worries me.
regards, tom lane
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