On Mar 8, 2007, at 11:51 PM, Greg Smith wrote:
almost everything that's dirty is also pinned during pgbench, and the LRU is lucky to find anything it can write as a result
I'm wondering if pg_bench is a good test of this stuff. ISTM it's unrealistically write-heavy, which is going to tend to not only put a lot of dirty buffers into the pool, but also keep them pinned enough that you can't write them.
Perhaps you should either modify pg_bench to do a lot more selects out of the various tables or look towards a different benchmark.
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