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Date: Sun, 18 Dec 2011 20:15:22 +0400
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: 1.7.9-jumbo

On Sun, Dec 18, 2011 at 05:03:50PM +0100, magnum wrote:
> The change is that in 1.7.8, we always had 16K keys_per_crypt, and in 
> 1.7.9 we have 8K x number of threads (the latter is capped to 4, because 
> it does not scale further). I did that on some AMD hardware using 
> gcc-4.5 and I did not see this performance drop (on the contrary).
> 
> The fastest formats will always show these variations depending on 
> hardware and exact compiler version but we could possibly change this to 
> 16K x number of threads and see if it helps.

This makes sense to me.

Here's what I get on 2xE5420.  1.7.8-jumbo-8:

Benchmarking: CRC-32 [32/64]... (8xOMP) DONE
Many salts:     247758K c/s real, 30931K c/s virtual
Only one salt:  26427K c/s real, 3299K c/s virtual

Benchmarking: CRC-32 [32/64]... (8xOMP) DONE
Many salts:     249135K c/s real, 31141K c/s virtual
Only one salt:  26411K c/s real, 3289K c/s virtual

1.7.9-jumbo-5:

Benchmarking: CRC-32 [32/64]... (4xOMP) DONE
Many salts:     196575K c/s real, 49021K c/s virtual
Only one salt:  22347K c/s real, 5586K c/s virtual

Benchmarking: CRC-32 [32/64]... (4xOMP) DONE
Many salts:     207585K c/s real, 51766K c/s virtual
Only one salt:  33751K c/s real, 8416K c/s virtual

I haven't tried making changes yet.

Number of benchmarks:           153
Minimum:                        0.79342 real, 0.56158 virtual
Maximum:                        12.03732 real, 8.47542 virtual
Median:                         1.00202 real, 1.00271 virtual
Median absolute deviation:      0.01500 real, 0.01710 virtual
Geometric mean:                 1.16469 real, 1.06979 virtual
Geometric standard deviation:   1.57763 real, 1.35698 virtual

Number of benchmarks:           153
Minimum:                        0.83322 real, 0.56479 virtual
Maximum:                        12.04051 real, 8.46831 virtual
Median:                         1.00429 real, 1.00097 virtual
Median absolute deviation:      0.01532 real, 0.01479 virtual
Geometric mean:                 1.16748 real, 1.07191 virtual
Geometric standard deviation:   1.57355 real, 1.36328 virtual

(two runs of each version to be more certain of the results).

Alexander

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