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Message-ID: <CANO7a6zpvZwvLiUR735y6XB7pR2EWei2RPv=TgbuKHqZ9XK-0A@mail.gmail.com>
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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