[kwlug-disc] benchmark: performance on six cores = 1 on one core = 6

[Lori Paniak]

Not that surprising.  Modern CPU cores are the fastest component in a
system - by an order of magnitude.  Once you get outside of the L2
cache, performance takes a big hit.  If a job will fit in one core
+on-die memory, it will run much faster than the same job spread over
several fractionally used cores.

Too bad the whole internet does not yet fit in a single CPU core.  If it
did, then his test program would model actual usage.

And for high-performance couputing, turn off the hyperthreading.  It
just confuses things.

On Wed, 2010-06-02 at 19:08 -0400, Richard Weait wrote:
> Benchmarking a server application finks that performance is six times
> better when restricted to a single core
> 
> http://mailinator.blogspot.com/2010/02/how-i-sped-up-my-server-by-factor-of-6.html
> 
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