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 -- 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
