Posted Apr 15, 2008 4:39 UTC (Tue) by JoeBuck
In reply to: 64-bit performance
Parent article: My kid hates Linux (ZDNet)
Take a box with 2 Gb of memory. Run a program that requires a 1.5 Gb working set to avoid paging with 32 bit code, where the in-memory structure is heavy with pointers. Now recompile with -m64. Voila, it now needs maybe 2.5 Gb to avoid paging. You might well see the 64 bit code run 100 times slower.
We run workloads like that all the time.
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