Hi, On Sun, Apr 20, 2014 at 11:24:38AM +0200, Palle Girgensohn wrote: > > I see performance degradation with PostgreSQL 9.3 vs 9.2 on FreeBSD, and I'm > wondering who to poke to mitigate the problem. In reference to this thread > [1], who where the FreeBSD people that Francois mentioned?
At least one FreeBSD hacker came to discuss it on the #dragonflybsd irc channel and tried to run the benchmark on a 80-core machine. I didn't keep logs and don't remember his/their name(s) but there was definitely some FreeBSD effort at the time to investigate and fix things. > If mmap needs to perform well in the kernel, I'd like to know of someone with > FreeBSD kernel knowledge who is interested in working with mmap perfocmance. > If mmap is indeed the cuplrit, I've just tested 9.2.8 vs 9.3.4, I nevere > isolated the mmap patch, although I believe Francois did just that with > similar results. I did test the 9.3 -devel branch before and after the SysV shared memory => mmap commit. The performance degradation was visible. I recently ran a few benchmarks of PostgreSQL 9.3 with different operating systems including DragonFly 3.6 and FreeBSD 10. You may be interested in the results: http://lists.dragonflybsd.org/pipermail/users/2014-March/128216.html -- Francois Tigeot -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
