Messages in this thread | | | Date | Wed, 18 Dec 2002 09:56:56 -0800 | From | Andrew Burgess <> | Subject | Re: HT Benchmarks (was: /proc/cpuinfo and hyperthreading) |
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>Number of threads Elapsed time User Time System Time >1 53:216 53:220 00:000 >2 29:272 58:180 00:320 >3 27:162 1:21:450 00:540 >4 25:094 1:41:080 01:250
>Elapsed is measured by the parent thread, that is not doing anything >but wait on a pthread_join. User and system times are the sum of >times for all the children threads, that do real work.
>The jump from 1->2 threads is fine, the one from 2->4 is ridiculous... >I have my cpus doubled but each one has half the pipelining for floating >point...see the user cpu time increased due to 'worst' processors and >cache pollution on each package.
>So, IMHO and for my apps, HyperThreading is just a bad joke.
Why do you care about user time? The elapsed time went down by 4 minutes (2->4 threads), if that's a joke I don't get it :-)
New Intel Ad: "What are you going to do with your 4 minutes today?"
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