Re: sysbench threading performance problems

2010-04-08 Thread Matthew Dillon
:Pretty much defaullt: : :sysbench --num-threads=1 --test=fileio --file-test-mode=seqrd run : :Im not sure if the defaults are sane or insane. The only difference between :these 2 boxes is the OS and the DF box has 2Gb but the FBSD has 4Gb RAM. : :Petr You're hitting a cache blowout

sysbench threading performance problems

2010-04-07 Thread elekktretterr
Hi, Im trying to benchmark DF with sysbench and got 2 issues: The cpu and OLTP (using mysql) benchmarks are ridiculously slow. ie. with one thread they take minutes to complete while on freebsd its a matter of seconds. Can someone verify this? I dont know if its sysbench or DragonFly bug. Petr

Re: sysbench threading performance problems

2010-04-07 Thread elekktretterr
However whats interesting is DF performance in the fileio/seqrd benchmark with one thread. DF seems to be about 4 times slower. But when you add 2nd thread it almost catches up with FBSD.

Re: sysbench threading performance problems

2010-04-07 Thread Matthew Dillon
:However whats interesting is DF performance in the fileio/seqrd benchmark :with one thread. DF seems to be about 4 times slower. But when you add 2nd :thread it almost catches up with FBSD. What parameters to sysbench are you using and is the data set being tested large enough to blow

Re: sysbench threading performance problems

2010-04-07 Thread Petr Janda
What parameters to sysbench are you using and is the data set being tested large enough to blow out the system caches? Pretty much defaullt: sysbench --num-threads=1 --test=fileio --file-test-mode=seqrd run Im not sure if the defaults are sane or insane. The only difference between