Building a High-Performance Cluster with Gentoo
Posted Apr 10, 2007 17:47 UTC (Tue) by stevenj
Parent article: Building a High-Performance Cluster with Gentoo
If you can increase the speed of your code by 5%, you save a day and a half every month. The amount of work you can accomplish with that extra time really adds up when you consider hundreds or thousands of CPUs.
Not if you spend two days every month tweaking compiler flags, recompiling your system, and benchmarking the resulting executables...
I see claims of Gentoo's performance advantages being tossed around a lot; can someone point to benchmarks to back them up?
In my experience, the performance of system binaries is usually almost irrelevant to scientific code. What matters is how you compile your own code and perhaps a few key libraries like the BLAS, but in neither case do you need to recompile your whole OS.
(And in any case, compiler tricks are usually the least significant part of a serious optimization effort, if you know what you are doing.)
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