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Message-ID: <CAN4B415MMJ=Bse0aBaV6FYrq1-LTv6EhYVTAAdehjAKt7GwJXw@mail.gmail.com> Date: Sun, 10 May 2015 21:48:08 +0200 From: Luis Rocha <luiscrocha@...il.com> To: john-users@...ts.openwall.com Subject: Re: Multiple Cores and GPU Got it, thank you magnum! On Sun, May 10, 2015 at 9:11 PM, magnum <john.magnum@...hmail.com> wrote: > On 2015-05-10 19:57, Luis Rocha wrote: > >> I am trying to get john to use all CPU cores and 1 GPU together. >> >> Not sure how to do this but my current system has 4 cores and 1 GPU but >> when I try to use the --fork suffix I would like to set that for CPU >> device >> use --fork=4 but for GPU --fork=1 >> Because when I try to use --fork=4, John starts a second instance running >> on the GPU which is useless .... >> >> Is this possible? >> > > No... well, almost: In the (few) cases where the OpenCL format using the > CPU device is as fast as a plain CPU format, you could just use > "--format=md5crypt-opencl --fork=2 -dev=all" and it would use one process > for GPU and another process using all CPU cores via OpenCL. > > Other than that, I'd recomment either using the --node option to split the > job in parts and run them separately, or simply run two different attacks > (eg. one using mask mode on GPU and another using wordlist mode on CPUs). > > magnum > > >
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