Date: Wed, 7 Sep 2016 21:45:45 +0200 From: magnum <john.magnum@...hmail.com> To: john-users@...ts.openwall.com Subject: Re: JtR, MPI and CUDA+CPU core usage? On 2016-09-07 08:29, Darren Wise wrote: > I've got a bit of a silly question here folks, nothing I have actually tried yet.. > I have an MPIEXEC install of JtR, 10 nodes (48 CPU cores) I literally have just plonked in my first CUDA card and not even powered it on yet to install the nVidia drivers. > I am a little concerned, I will reinstall JtR on my MPIserver which uses Ubuntu 14.4LTS server install.. Of which I will include the flags for CUDA support... > I know this sounds really really stupid, but when as I have done launch -n 48 (48 threads to run on 48 CPU cores) do I now have to spawn -n (number of CPU and total number of GPU cores) Using CUDA, you'll not be able to use CPU's and GPU's in a single job. You should run one MPI process per GPU *card*. You can start another job using the remaining CPU cores on those machines plus all cores on machines that lack a GPU. I recommend using OpenCL (even for nvidia), not CUDA. Our OpenCL formats are way ahead of the CUDA ones, in number and in quality. magnum
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