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Date: Thu, 19 Feb 2015 19:58:11 +0100
From: magnum <john.magnum@...hmail.com>
To: john-dev@...ts.openwall.com
Subject: Re: descrypt speed

On 2015-02-19 08:30, Royce Williams wrote:
> ... and fork=8 (more processes starved for CPU, but more aggregate throughput):
> 
> 5 0g 0:00:02:20 0.00% 3/3 (ETA: 2016-08-08 08:33) 0g/s 18030Kp/s
> 18030Kc/s 18030KC/s GPU:39°C fan:45% 2d2inl1n..2d2ottrd
> 1 0g 0:00:02:30 0.00% 3/3 (ETA: 2016-01-29 00:52) 0g/s 28015Kp/s
> 28015Kc/s 28015KC/s GPU:46°C fan:45% 03-9be32..03alus42
> 4 0g 0:00:02:30 0.00% 3/3 (ETA: 2016-03-02 19:39) 0g/s 25572Kp/s
> 25572Kc/s 25572KC/s GPU:32°C fan:45% plzzgm1...plp2b3sk
> 3 0g 0:00:02:30 0.00% 3/3 (ETA: 2016-01-23 10:53) 0g/s 28654Kp/s
> 28654Kc/s 28654KC/s GPU:33°C fan:45% 8c9gt7i..8cci13k
> 6 0g 0:00:02:20 0.00% 3/3 (ETA: 2016-09-10 02:55) 0g/s 16992Kp/s
> 16992Kc/s 16992KC/s GPU:39°C fan:45% kmk14en8..kmher2a3
> 7 0g 0:00:02:30 0.00% 3/3 (ETA: 2016-01-26 16:56) 0g/s 28266Kp/s
> 28266Kc/s 28266KC/s GPU:46°C fan:45% lhgeh730..l0nn0wow
> 8 0g 0:00:02:30 0.00% 3/3 (ETA: 2016-02-13 21:08) 0g/s 26841Kp/s
> 26841Kc/s 26841KC/s GPU:41°C fan:45% cl1kiylu..clrh2bl1
> 2 0g 0:00:02:30 0.00% 3/3 (ETA: 2016-03-02 11:01) 0g/s 25565Kp/s
> 25565Kc/s 25565KC/s GPU:41°C fan:45% do_7af3..di7z7h8
> 
> (Aggregate: 197935Kp/s)

Unless I misunderstand, this does not make sense. If you overbook six
GPU's using --fork=8, the two "extra" processes will each be pegged to a
GPU, just like the first six. So it will end up in 2 GPUs running 2
processes each, and 4 GPUs running one each. In case of CPU it would
have worked fine (no affinity).

Bottom line is you probably want to use either --fork=6 or --fork=12.

magnum

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