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Date: Wed, 16 Jan 2013 22:33:45 +0100
From: magnum <>
Subject: Re: CUDA multigpu first draft for pwsafe

On 16 Jan, 2013, at 22:22 , Lukas Odzioba <> wrote:

> I am posting this mostly as an archive.
> Thanks to one of john users  I got access to GTX 690. This is dual gpu
> card and currently it uses only one of it, which is not good at all.
> I attached first draft of multigpu code for pwsafe format, we may not
> commit that now, but it would be great to have it in the next official
> jumbo.
> For identical gpus code scales very well:
> before:
> Raw:    96376 c/s real, 97090 c/s virtual
> after:
> Raw:    192752 c/s real, 192752 c/s virtual
> I added "GPUS" macro to cuda_pwsafe.h, so we must set it before
> compilation but, in the final version code will be able to use -dev
> arguments which are now omitted.
> Known problems:
> -code will scale well only if gpus are identical
> -it requires at least cuda 4.0 (this is not checked now)
> -it wasn't heavily tested at all
> Good news is that almost all code changes were done in .cu file.
> I'll try create proper patches for other formats.
> Lukas
> <cuda_pwsafemultigpu.diff>

Excellent, I will commit this to bleeding (sooner or later) and then we'll sort out any problems.


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