Date: Sun, 27 Nov 2011 20:09:34 +0100 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-fs@freebsd.org Subject: lseek() scalability and PostgreSQL Message-ID: <jau1tg$vib$1@dough.gmane.org>
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Interesting tidbit from PostgreSQL optimization: http://rhaas.blogspot.com/2011/11/linux-lseek-scalability.html """ PostgreSQL calls lseek quite frequently (to determine the file length, not to actually move the file pointer), and due to the performance enhancements in 9.2devel, it's now much easier to hit the contention problems that can be caused by frequently acquiring and releasing the inode mutex. But it looks like this should be fixed in Linux 3.2, which is now at rc1, and therefore on track to be released well before PostgreSQL 9.2. """ It looks like this might cause some of the things I've observed on many-core servers.home | help
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