Date: Fri, 30 Aug 2013 08:13:01 +0530 From: Sayantan Datta <std2048@...il.com> To: john-dev@...ts.openwall.com Subject: Re: Sayantan Weekly Report #11 Hi magnum, On Fri, Aug 30, 2013 at 3:21 AM, magnum <john.magnum@...hmail.com> wrote: > I meant it's poor on this GPU regardless of that bugfix patch. 57M is just > three times faster than one CPU core. > > Here's a theory: Since mask mode currently picks 26*26 == 676 as > multiplier in this case, I have no choice other than to lower GWS all the > way to 16384 (ending up in a KPC of 11075584) to keep kernel duration short > enough to avoid triggering watchdogs and rebooting the whole thing. I > presume the "low" GWS is the reason for the poor performance. Maybe it > would be way better with a multipler of 26 and a GWS of 524288... in *this* > case. > > Maybe the kernel can be improved (reducing need for high GWS) but > regardless of that, this means auto-tuning will be trickier: You need to > figure out not only the GWS but the best *combination* of GWS and GPU-side > mask that completes in less than 200ms. > You can set db->max_int_keys=26 in reset. This will limit multiplier to 26. Yes, device tuning can be a bit tricky. Also, it is not possible to tune mask settings in runtime with the current version. I'm hoping to fix the issue in this week. Regards, Sayantan Content of type "text/html" skipped
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