Date: Thu, 12 Jul 2012 22:14:02 +0530 From: Dhiru Kholia <dhiru.kholia@...il.com> To: john-dev@...ts.openwall.com Subject: Re: RAdmin, SIP speedup On Sun, Jul 8, 2012 at 11:00 AM, Solar Designer <solar@...nwall.com> wrote: > BTW, note that this is not a true 8-core machine (it's Bulldozer with > its 4 modules and 2 cores per module; also it reduces clock rate from > 4.0 GHz to 3.1 GHz or maybe slightly higher when under full load), so > the perfect speedup would be about 6x. Thus, 3x is "only" twice worse > than perfect. 4 modules * 2 cores / module = 8 cores. I don't understand why the perfect speedup is only 6x. (In practice with OpenMP and JtR, I am seeing a speedup of ~ 4.7x on bull). -- Cheers, Dhiru
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