> -----Original Message----- > From: Tom Lane [mailto:[EMAIL PROTECTED] > Sent: 31 January 2005 16:35 > To: Mark Cave-Ayland > Cc: pgsql-hackers@postgresql.org > Subject: Re: [HACKERS] 7.3.8 under FC3 takes excessive semaphores?
(cut) > Judging by the symptoms, you have built a version with what > we now call --disable-spinlocks; that is, it didn't figure > out how to do assembly TAS on your platform and fell back to > using SysV semaphores for spinlocks. Quite aside from the > drain on semaphores, the performance is going to be > spectacularly bad, so you'd better fix that. > > regards, tom lane Hi Tom, I'd just about managed to come to the same conclusion before your email arrived by spending the afternoon with gdb tracing into the LWLock code :) I've just installed 7.4.6 on the same box and this time the spinlocks are correctly picked up and everything works as expected. I think rather than fixing the 7.3.x source, we'll take the plunge and plan for a complete dump and restore of the database cluster over a weekend. Many thanks, Mark. ------------------------ WebBased Ltd South West Technology Centre Tamar Science Park Plymouth PL6 8BT T: +44 (0)1752 791021 F: +44 (0)1752 791023 W: http://www.webbased.co.uk ---------------------------(end of broadcast)--------------------------- TIP 3: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
