Date: Thu, 5 Jul 2012 09:06:57 +0400 From: Solar Designer <solar@...nwall.com> To: john-dev@...ts.openwall.com Subject: Re: Sayantan:Weekly Report #11 On Thu, Jul 05, 2012 at 08:57:01AM +0530, SAYANTAN DATTA wrote: > Achievements: > 1. Successfully compiled test openCL programs from modified il. Can you demonstrate this to us so that we better understand what exactly you're doing and what it looks like? Maybe create a wiki page like: http://openwall.info/wiki/john/development/AMD-IL (or suggest a more suitable name). Include the tiny(?) test programs in there, command-lines used to compile, sample output. The style of that wiki page can be similar to: http://openwall.info/wiki/internal/gcc-local-build > Integration > of the binary generator into JtR is possible but I first need your > permission as the generator requires libelf-devel as additional dependency. Is there already a need to integrate the support for this into JtR? In other words, what would your next steps be after such integration? Do you know what specific IL-level changes you'd try? > Priorities: > 1. More focus on optimizing the opencl kernels. OK. Can you try to answer these questions? - Which execution units and how many per CU does your bf_kernel.cl (as released in 1.7.9-jumbo-6) use on 7970? Does it use scatter/gather addressing? Or only gather? Or neither? How much LDS does it actually use? Does it use any other memory type(s) within the inner loop? Before you started with bf_kernel.cl, I estimated that we might be able to use up to 1/4th of 7970's computing resources yet fit in LDS. Is this what your code is trying to use or do you limit it to less, and why? I recall that you wrote somewhere that you were only able to use 32 KB of LDS per CU, not the full 64 KB. (However, I can't find this now.) Do I recall correctly, and if so why is that? Besides all of the above, your idea to use local and global memory at once is a good one. If we don't achieve much with other optimizations, perhaps we'll achieve something like 7000 c/s on 7970 by adding some use of global memory in parallel with the local memory uses currently in your kernel. Thanks, Alexander
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