> 21 apr 2014 kl. 11:26 skrev Francois Tigeot <ftig...@wolfpond.org>: > >> On Sun, Apr 20, 2014 at 04:07:25PM +0200, Palle Girgensohn wrote: >> >>>> 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 >> >> Interesting, indeed. The fixes to dragonfly where made quite recently, in >> 3.2, right? > > The most important fixes occured in the 3.1 development version, around > September 2012. > > There was definitely more than an isolated patch; the new scheduler was only > part of the performance improvements. > I'm afraid none of the commits would be applicable as-is to FreeBSD 10.x; the > DragonFly kernel is vastly different in locking, threading and VM management. > > The FreeBSD folks should know what to do though; I collected performance > counter data during the last benchmark run and sent it to adrian@. > It was also discussed on freebsd-performance; the thread begins here: > http://lists.freebsd.org/pipermail/freebsd-performance/2014-March/004770.html >
Great, thanks for the pointers! Palle -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
