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@xxxxxxxxxxxxxx> ----- X-Spam-Checker-Version: SpamAssassin 3.1.6 (2006-10-03) on noel.decibel.org X-Spam-Level: X-Spam-Status: No, score=-0.9 required=5.0 tests=AWL,BAYES_50, FORGED_RCVD_HELO,SPF_PASS autolearn=no version=3.1.6 Date: Sun, 25 Feb 2007 19:22:35 -0500 From: Kris Kennaway <kris@xxxxxxxxxxxxxx> To: current@xxxxxxxxxxx User-Agent: Mutt/1.4.2.2i Cc: performance@xxxxxxxxxxx Subject: Anyone interested in improving postgresql scaling? Precedence: list Errors-To: owner-freebsd-current@xxxxxxxxxxx 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 _______________________________________________ freebsd-current@xxxxxxxxxxx mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscribe@xxxxxxxxxxx" ----- End forwarded message ----- -- Jim C. Nasby, Database Architect decibel@xxxxxxxxxxx Give your computer some brain candy! www.distributed.net Team #1828 Windows: "Where do you want to go today?" Linux: "Where do you want to go tomorrow?" FreeBSD: "Are you guys coming, or what?"
