Date: Fri, 31 Aug 2012 20:30:09 -0400 (EDT) From: "Brad Tilley" <brad@...ystems.com> To: john-users@...ts.openwall.com Subject: Re: Questions about compiling for Optimal CPU Performance > Brad, why are you building with OpenMP on your Celeron? Does it have more than one logical CPU? If not, then the assembly code for DES is indeed faster than the thread-safe alternative that an OpenMP build would use. Even with two logical CPUs (but one core), the assembly code is likely faster (using only one of the logical CPUs). The performance hit of going from assembly to compiler-generated SSE2 code on 32-bit x86 is just too great. > > Alexander Hi Alexander, I don't use OpenMP on the Celeron. I should have made that clearer, to me it was just a similar compile question, so I posed them both together. Perhaps I should have asked two separate questions instead. I'll be more clear next time. Brad
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