[kris@obsecurity.org: Anyone interested in improving postgresql scaling?]

Ok, looks like the FreeBSD community is interested in PostgreSQL
performance, or at least enough to investigate it.

Anyone here have experience hacking on FreeBSD?

----- Forwarded message from Kris Kennaway <kris(at)obsecurity(dot)org> -----

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Date: Sun, 25 Feb 2007 19:22:35 -0500
From: Kris Kennaway <kris(at)obsecurity(dot)org>
To: current(at)FreeBSD(dot)org
User-Agent: Mutt/1.4.2.2i
Cc: performance(at)FreeBSD(dot)org
Subject: Anyone interested in improving postgresql scaling?
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If so, then your task is the following:

Make SYSV semaphores less dumb about process wakeups. Currently
whenever the semaphore state changes, all processes sleeping on the
semaphore are woken, even if we only have released enough resources
for one waiting process to claim. i.e. there is a thundering herd
wakeup situation which destroys performance at high loads. Fixing
this will involve replacing the wakeup() calls with appropriate
amounts of wakeup_one().

Kris

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