Date: Wed, 12 Nov 2014 19:29:30 -0900 From: Royce Williams <royce@...ho.org> To: john-users@...ts.openwall.com Subject: Re: Xeon Phi support? On Wed, Nov 12, 2014 at 2:09 PM, Solar Designer <solar@...nwall.com> wrote: > On Tue, Nov 11, 2014 at 10:17:30PM -0900, Royce Williams wrote: >> Given the recent sub-$200 pricing for the Xeon Phi 3151P, > > You mean 31S1P (that's S, not 5). Yes, thanks. > Note that you'll also need a capable motherboard (most won't run a > Xeon Phi) and chassis supporting passively-cooled PCIe cards (there are > inexpensive hacks around that, though). > > This is possibly the most affordable motherboard known to run Xeon Phi: > > http://www.asus.com/Motherboards/P9X79_WS/ Thanks for the lead. I had otherwise been looking at: http://www.asus.com/us/Motherboards/Z9PED8_WS/overview/ >> and the relative scarcity of inexpensive ZTEX boards :-) > > That's irrelevant. In the context that I intended -- my own personal project to assemble an affordable JtR platform for descrypt -- it's not irrelevant (unless I'm missing your point). >> what are the >> potential and likely performance, and level of effort required to use >> Intel Phi boards with John the Ripper? Just looking for some rough >> approximations. > > For descrypt, up to 80M c/s in current benchmarks (with unreleased code). > The level of effort depends on how much to support - which formats, > which ways to access the Xeon Phi boards from host (OpenCL, OpenMP > offload, OpenMP native). OpenCL already sort of works, but is quite > pointless to use currently, as magnum said. Thanks for the overview - makes sense. For the unreleased descrypt code, is that 80M c/s number dependent on being fed candidate passwords from CPU, as is the case for descrypt-opencl on GPU? Royce
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