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Date: Thu, 25 Dec 2014 17:58:37 +0300
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: bcrypt BF_X2=3 is not always best

On Thu, Dec 25, 2014 at 05:14:59AM +0300, Solar Designer wrote:
> Here's an example, off Twitter:
> 
> <@...l_sargent> @solardiz "--test --format=bcrypt" BF_X2=1 is 8625,8784,8640,8928,8856,8784.  BF_X2=3 is 8208,8233,8208,8424,8424,8424,8340,8233,8233,8258.
> 
> This is on i7-5820K, 3.3+ GHz, running 12 threads on 6 cores, JtR built
> with gcc 4.8.2-19ubuntu1 per @will_sargent's entry on:
> 
> http://openwall.info/wiki/john/benchmarks

More stable speeds on the same machine:

<@...l_sargent> @solardiz Running in single user mode, CrashplanEngine killed. 8447, 8532, 8447, 8447, 8424.
<@...l_sargent> @solardiz single user mode, B2_X2=1 yields 9000,8982,8910,9000,8910,8928,9000.

So we have a ~5% performance regression by going BF_X2=3 on this machine.

Alexander

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