The most recent results seem to indicate that the prefetch isn't worth pursuing, but the vm test is. Can someone repeat the perf tests on something larger so we can see, when/if there is a benefit?
Jeff, can you add detailed comments to explain the theory of operation of these patches? The patches add the code, but don't say why. We will forget, so lets put the detail in there now please. Thanks.
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Simon Riggs http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services