Date: Mon, 8 Jul 2013 01:27:40 +0200 From: magnum <john.magnum@...hmail.com> To: john-dev@...ts.openwall.com Subject: Re: bug: GPU use in CPU-only formats On 8 Jul, 2013, at 1:10 , magnum <john.magnum@...hmail.com> wrote: > On 7 Jul, 2013, at 18:22 , Sayantan Datta <std2048@...il.com> wrote: >> I found the root cause of this problem. Nvidia blocks the thread after each clEnqueueNDRangeKernel call which is not the case with AMD. > >> http://www.khronos.org/message_boards/showthread.php/5822-non-blocking-call-to-clEnqueueNDRangeKernel > > WTF, that really sucks. So what they say in that thread is still true? It means we can't juggle two buffers or do CPU work during kernel execution. Some empirical tests on my laptop as well as on Bull indicate that this is no longer true. The kernel is enqueued and CPU thread continues. magnum
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