At 05:22 AM 12/23/2008, Pieter de Goeje wrote:
On Tuesday 23 December 2008, Ivan Voras wrote:
> Mike Tancsa wrote:
> > Just got our first board to play around with and unlike in the past,
> > having hyperthreading enabled seems to help performance.... At least in
> > buildworld tests.
> >
> > doing a make -j4 vs -j6 make -j8 vs -j10 gives
> >
> > -j buildworld time % improvement over -j4
> > 4 13:57
> > 6 12:11 13%
> > 8 11:32 18%
> > 10 11:43 17%
>
> Thanks for posting this!
What's missing is build times with hyperthreading disabled.
make buildworld -j10 could easily be faster than -j4 even when hyperthreading
is disabled, because of increased disk I/O concurrency.
11:43 to build world is very fast indeed :-)
With HT disabled in the BIOS
make -j4, 13:48
make -j8, 12:35
so -j4 is about the same, but -j8 does show a bit of an improvement
with HT enabled ( ~9%) ...
---Mike
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