Date: Thu, 16 Aug 2012 23:56:46 +0200 From: Lukas Odzioba <lukas.odzioba@...il.com> To: john-dev@...ts.openwall.com Subject: Re: OpenCL implementation of GPG format 2012/8/14 Dhiru Kholia <dhiru.kholia@...il.com>: > Hi, > > I have written an OpenCL implementation of GPG format. Currently, the > speedup is very low (9x). The compiler complains about register > spilling. According to http://dl.acm.org/citation.cfm?id=2039822 > speedups upto 100x can be achieved. I love all those "scientists" who publish awesome results but do not bother to publish any code, did they? > Can someone on the list take a look and try to troubleshoot the > performance issues? Thanks! This is quite typical for all formats which use those magical update,init,final functions taken from cpu code. This do not work well on gpu at all. To achieve reasonable performance code needs a lot of work, step by step removing those functions and replace them with something smaller, with less memory operations, that do not use 8bit types, fitted to password and salt max lengths, that can be vectorized and so on. It is not an easy task but it is possible, maybe even then it could outperform those claimed 100x. Lukas
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