Re: SMP/HTT and Beowulf cluster on FreeBSD 7.0-RELEASE

Petri Helenius <[email protected]> Fri, 28 Mar 2008 06:57:17 +0200

Newsgroups	gmane.os.freebsd.devel.smp
Message-ID	<[email protected]>

Stephen Montgomery-Smith wrote:
>
> My personal experience is that HTT did help.  This was with an older 
> Xeon dual processor system, and I was running multithreaded programs 
> that were basically huge amounts of floating point calculations (a bit 
> like FFT).
In my experience HTT helps 20-30% in a well engineered workload. Extreme 
care needs to be taken on minimizing synchronization primitive overhead 
or that will take away your gain. (don't have 4 or 8 threads hammering 
on one mutex a million times a second)

Pete

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