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Date: Thu, 13 Nov 2014 02:09:16 +0300
From: Solar Designer <>
Subject: Re: Xeon Phi support?

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).

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:

> and the relative scarcity of inexpensive ZTEX boards :-)

That's irrelevant.

> 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.


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