On 02/15/12 21:54, Jeff Roberson wrote:
On Wed, 15 Feb 2012, Alexander Motin wrote:
As before I've tested this on Core i7-870 with 4 physical and 8
logical cores and Atom D525 with 2 physical and 4 logical cores. On
Core i7 I've got speedup up to 10-15% in super-smack MySQL and
PostgreSQL indexed select for 2-8 threads and no penalty in other
cases. pbzip2 shows up to 13% performance increase for 2-5 threads and
no penalty in other cases.
Can you also test buildworld or buildkernel with a -j value twice the
number of cores? This is an interesting case because it gets little
benefit from from affinity and really wants the best balancing possible.
It's also the first thing people will complain about if it slows.
All night long buildworld run on Core i7-2600K (4/8 cores) with 8GB RAM
and RAID0 of two fast SSDs found no bad surprises:
old new %
1 4242.33 4239.69 -0.0622299538
2 2376.4433 2340.47 -1.5137453521
4 1581.3033 1430.1733 -9.5573063055
6 1394.8033 1348.0533 -3.3517270858
8 1365.8067 1315.87 -3.6562055231
10 1312.8533
12 1350.23 1313.2667 -2.7375558238
16 1346.2267 1306.0733 -2.9826625783
20 1313.31
Each point there averaged of 3 runs.
--
Alexander Motin
_______________________________________________
freebsd-hackers@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-hackers
To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
