Date: Wed, 17 Jul 2013 00:19:20 +0200 From: magnum <john.magnum@...hmail.com> To: john-dev@...ts.openwall.com Subject: Re: bug: GPU use in CPU-only formats On 13 Jul, 2013, at 22:33 , Solar Designer <solar@...nwall.com> wrote: > This problem is still present, and it manifests itself in an even worse > way than I had thought. Not only is there some use of the first GPU > during CPU-only runs with an OpenCL-enabled build, but also CPU time is > being wasted by some OpenCL-related overhead, which slows down CPU-based > cracking (in some of my tests, by more than a factor of 2 - that's when > OpenMP is also in use). This is easily reproducible on our new dev box > (which I'll create you accounts on shortly), where several ksoftirqd > kernel threads appear high in "top" when running a CPU-only format in an > OpenCL-enabled build of JtR. So the GPUs start to run havoc just from a device query. In my world this is clearly a driver bug. I will work around it once I get some time and inspiration occuring at the same time. magnum
Powered by blists - more mailing lists
Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.