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Date: Wed, 20 Jun 2012 00:14:44 +0400
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: bf-opencl
On Wed, Jun 20, 2012 at 12:04:13AM +0530, SAYANTAN DATTA wrote:
> How do I compile program written in IL? Is there any documentation
> regarding AMD IL?
Yes:
http://developer.amd.com/sdks/AMDAPPSDK/assets/AMD_Intermediate_Language_(IL)_Specification_v2.pdf
(506 pages). I think there's a lack of documentation on GCN, though.
I think we should start by reviewing code generated from OpenCL source,
much like we review x86-64 assembly code generated by gcc.
> BTW the bf_kernel is stable upto 1225Mhz core and 1300MHz memory.
Does this mean it was no longer stable at 1250 MHz core? Are you
referring to my test from yesterday, where I got ASIC hang at 1250 MHz
after 3.5 minutes? If so, that does not tell me much because I also got
a system reboot after 15 minutes running the same code at stock clocks.
BTW, changing the memory clock back and forth did not affect bf-opencl
performance at all, which confirms that it indeed does not use global
memory much (in the current code revision). That's good.
Alexander
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