Date: Sat, 21 Jan 2012 00:52:17 +0400 From: Solar Designer <solar@...nwall.com> To: john-users@...ts.openwall.com Subject: Re: DES with OpenMP On Fri, Jan 20, 2012 at 08:30:53PM +0000, Alex Sicamiotis wrote: > anyway gcc 4.6/4.7 was crap Indeed. Please try 4.3. Really. > Indeed, while running top with the omp build / threads=1, a spike in a second thread occured of about 5%. So threads=1 in openMP icc build appears slightly better even than a non-openMP icc build on multiple core cpus. It has to be a single core cpu to make an accurate benchmark. It took me a while to figure it out though.... That's puzzling. Frankly, I am not convinced that your analysis is correct, although it might be. As seen from my benchmarks for different gcc versions, a speedup of about 7% on top of the DES_BS_ASM code is in fact possible. Thanks for the update! Alexander
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