On Sun, 4 May 2008, Tom Lane wrote:

However, I am completely unable to measure any performance improvement
from it.  Given the possible risk of out-of-memory failures, I think the
patch should not be applied without some direct proof of performance
benefits, and I don't see any.


Fair enough. There were some pgbench results attached to the original patch submission that gave me a good idea how to replicate the situation where there's some improvement. I expect I can take a shot at quantifying that independantly near the end of this month if nobody else gets to it before then (I'm stuck sorting out a number of OS level issue right now before my testing system is online again). Was planning to take a longer look at Greg Stark's prefetching work at that point as well.

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* Greg Smith [EMAIL PROTECTED] http://www.gregsmith.com Baltimore, MD

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