| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Mark Kirkwood <markir(at)paradise(dot)net(dot)nz> |
| Cc: | Pavan Deolasee <pavan(at)enterprisedb(dot)com>, Gavin Sherry <swm(at)alcove(dot)com(dot)au>, Luke Lonergan <llonergan(at)greenplum(dot)com>, PGSQL Hackers <pgsql-hackers(at)postgresql(dot)org>, Doug Rady <drady(at)greenplum(dot)com>, Sherry Moore <sherry(dot)moore(at)sun(dot)com> |
| Subject: | Re: Bug: Buffer cache is not scan resistant |
| Date: | 2007-03-05 21:36:39 |
| Message-ID: | 22773.1173130599@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Mark Kirkwood <markir(at)paradise(dot)net(dot)nz> writes:
> Tom Lane wrote:
>> Mark, can you detect "hiccups" in the read rate using
>> your setup?
> I think so, here's the vmstat output for 400MB of shared_buffers during
> the scan:
Hm, not really a smoking gun there. But just for grins, would you try
this patch and see if the numbers change?
regards, tom lane
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