Date: Fri, 19 Jul 2013 11:30:30 +0200 From: magnum <john.magnum@...hmail.com> To: john-dev@...ts.openwall.com Subject: Re: bug: GPU use in CPU-only formats On 17 Jul, 2013, at 0:19 , magnum <john.magnum@...hmail.com> wrote: > 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. Hopefully this is fixed for good now. No OpenCL initialization whatsoever happens untill an OpenCL format calls opencl_init(). Thanks to Claudio for fixing the missing pieces. 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.