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USuser1055918
 

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    1. PO
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    2. PODisappointing performance in Ubuntu for computational workload
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    1. COYes, I get the impression that there's convergence of opinion here that it is down to the system libraries. This is something of a surprise to me as I naively thought that something like calculating exp() would be optimised into oblivion by default. It is just one bottleneck which I was able to pin down, but I'm sure my real code will have others. Are there any free maths libraries (a-la ATLAS in the BLAS space) that speeds up maths operations? I don't think I can stretch to expensive (?) Intel compilers!
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    2. COThanks, didn't know about `taskset` ... I just learned a new Linux tool. Unfortunately it doesn't show up a difference in timing though. I used cpufreq-set to change the governor to performance and there's not a statistically noticeable change really. Nice ideas to try though, thanks.
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    3. COThanks. In reality though the example I've provided is contrived simply to show something that (in my limited experience) I found surprising: that I'm having trouble getting any bang-for-buck out of the new workstation which was supposed to speed up my work more than 10%! The work I'm doing is not easily parallelisable, hence going for the fastest Core i7 possible, rather than, say, a lower clocked dual 6-core Xeon. I guess @StephenCanon is indicating my hopes of getting more than cycle-for-cycle improvement, or at least more than 10% improvement is not unrealistic to have hoped?
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