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64-bit performance64-bit performancePosted Apr 15, 2008 18:38 UTC (Tue) by JoeBuck (subscriber, #2330)In reply to: 64-bit performance by bronson Parent article: My kid hates Linux (ZDNet) "If you're not convinced, let's try this exercise again with a hypothetical 3.2 GB data set." You've just answered your own question. Now you can run a problem that requires a 3.2GB working set with your 32 bit executable quickly (if you can squeeze it into the 4GB address space, and you'll need what Red Hat used to call the hugemem patch to make it work), but it takes maybe 5GB with the 64 bit executable, and the 32 bit version runs quicker. Of course, you need the 64 bit executable when the problem size exceeds 4GB. The point is, it is useful for the developer to provide the user with both executables, to run on an operating system that can run both.
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