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Message-ID: <37519d5b2faa270f4c2856761ae9c0b3@smtp.hushmail.com>
Date: Wed, 12 Nov 2014 23:57:30 +0100
From: magnum <john.magnum@...hmail.com>
To: john-users@...ts.openwall.com
Subject: Re: Xeon Phi support?
On 2014-11-12 23:35, Solar Designer wrote:
> On Wed, Nov 12, 2014 at 09:39:07PM +0100, magnum wrote:
>> Solar/Openwall has a Xeon Phi 5110P in a dev box. The (admittedly old)
>> drivers currently installed on that box are *awful*, they fail compiling
>> many kernels and others segfault when running. This driver is worse than
>> Apple's OpenCL drivers for nvidia/AMD two years ago, which would
>> otherwise easily hold the world record in crappiness.
>>
>> Right now I'm not interested in playing with the Phi for that reason alone.
>
> As you're aware, OpenCL is a wrong way to use Xeon Phi, at least
> currently. Besides the poor state of OpenCL support for it, why buy the
> normally expensive Xeon Phi and then use it as if it were a cheap GPU?
Yes, I should have mentioned that. But I think there's potential for
much better OpenCL performance too, with better drivers.
> Perhaps it'd help you appreciate the good things about Xeon Phi if you
> temporarily forget the existence of OpenCL support for it?
>
> We need to update JtR's CPU "formats" to use Xeon Phi intrinsics. I did
> that for bitslice DES (unreleased; I should release now that there's
> some interest in Xeon Phi), and the rest of the team may easily do it
> for other SIMD'able hash types. For a handful of them, such as SunMD5
> and scrypt, things might be slightly interesting performance-wise.
If you release that patch, it would probably help me getting started. I
usually approach new stuff in a very disorganized manner but once I get
the hang of it I could easily get the idea to spend several days with
the Jumbo-specific intrinsics stuff.
> We need to support cross-compiling of jumbo for Xeon Phi, or/and to add
> support for OpenMP offload. In my bitslice DES experiments, I was
> compiling 1.8.0 with my patches, not jumbo. To compile jumbo, we first
> need to cross-compile some libraries.
We should make sure Jumbo's autoconf can produce a valid Makefile for
cross compiling to Phi. Most, if not all, things should be in place
already - as long as there is a toolchain and libs in place.
magnum
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