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Date: Tue, 25 Aug 2015 11:46:04 +0200
From: magnum <john.magnum@...hmail.com>
To: john-dev@...ts.openwall.com
Subject: Re: -dev=... -fork=... wastes GPU memory
On 2015-08-25 07:26, Solar Designer wrote:
> magnum,
>
> Running this command on super:
>
> ./john -form=md5crypt-opencl 6.md5crypt.pw -fork=3 -dev=0,1,5 -mask='?l?l?l?l?l?l?l?l'
>
> I get this in nvidia-smi output:
>
> +-----------------------------------------------------------------------------+
> | Processes: GPU Memory |
> | GPU PID Type Process name Usage |
> |=============================================================================|
> | 0 17041 C ./john 68MiB |
> | 0 17042 C ./john 68MiB |
> | 0 17043 C ./john 106MiB |
> +-----------------------------------------------------------------------------+
>
> It looks like the two child processes that target other GPUs nevertheless
> consume some memory on this GPU card as well. Why is that, and can we
> avoid it?
>
> I guess the same happens for AMD GPUs as well, but we don't have such
> nice reporting for them. Recent nvidia-smi is very nice in this respect.
Interesting. Well, we do enumerate all GPUs and I guess we create some
kind of contect for all of them. Maybe we can drop the ones we wont use.
I'll have a look at it.
magnum
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