Στις Wednesday 12 January 2011 21:17:00 ο/η Alex Hunsaker έγραψε: > 2011/1/12 Achilleas Mantzios <achill@xxxxxxxxxxxxxxxxxxxxx>: > > > > > Changed that to smth like: micros_total = micros_total + (double) micros; > > instead of the printf to beat any compiler optimization, and still linux runs at light speed: > > FBSD_TEST : user 0.089s, sys 1.4s > > FBSD_DEV : user 0.183s, sys 3.8s > > LINUX_PROD : user 0.168s, sys 0s > > (regarding that gettimeofday is a syscall in FreeBSD, and that sys time is 0 for linux, makes me think some optimization is being done) > > At least on x86_64, linux will use a vsyscall (v for virtual) for > gettimeofday which does not actually need to enter/exit the kernel. > That probably explains a large part of the speed difference here. > Thanx, thats the ARCH (x86_64) of our linux system. -- Achilleas Mantzios -- Sent via pgsql-admin mailing list (pgsql-admin@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-admin
