Tom Lane wrote:
You might try the attached patch (which I just applied to HEAD).
It cuts down the number of acquisitions of the BufMgrLock by merging
adjacent bufmgr calls during a GIST index search.  [...]

Thanks - I applied it successfully against 8.0.0, but it didn't seem to have a noticeable effect. I'm still seeing more or less exactly 25% CPU usage by postgres processes and identical query times (measured with the Perl script I posted earlier).

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