Date: Sat, 13 Oct 2012 02:31:15 +0400 From: Solar Designer <solar@...nwall.com> To: john-dev@...ts.openwall.com Subject: Re: bitslice DES on GPU Hi Sayantan, I'm sorry I have no time to seriously look into this sub-project lately. On Fri, Oct 12, 2012 at 09:04:32AM +0530, Sayantan Datta wrote: > I am now using bitselect() and AMD sboxes for AMD gpus. Great. Does this no longer cause a slowdown? > So my kernel is > mostly at its final stages requiring the tweaks for latency and registers > in the sboxes. Can you provide some idea regarding this. I think it's premature. In fact, I think that several of your recent optimizations were premature (I'm sorry I did not have time to comment). What use is speeding it up by a few percent when it's like 10x slower than expected? Well, you may do that to make it a bit more useful temporarily, until we have time to seriously look into the bottlenecks and hopefully resolve them. > Also I'm thinking > to port cmp_all and cmp_one to opencl. Also is it possible/viable to port > get_hash() to opencl? Of these, under the current formats interface, only cmp_all() is likely reasonable to have on GPU. Further speedup in this area is possible once we integrate the formats interface changes that I implemented for myrice's work this summer (they're not committed yet, except to myrice's experimental trees). Thanks, Alexander
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