Date: Wed, 18 Apr 2012 17:02:59 +0530 From: SAYANTAN DATTA <std2048@...il.com> To: john-dev@...ts.openwall.com Subject: System Responsiveness and GPU temps During Cracking on GPU Hi Samuele,magnum and others I was stress testing my gpu and MSCASH2 algorithm for some real scenarios. So I loaded a 6 digit password("hd4890") hash in the file pw. This is what I loaded. sayantan:64d3e78d25d36de331cf680c6603f89b Then I ran: ./john pw -fo=mscash2-opencl After running for about 20 minutes i.e. nearly 350 crypt_all() calls on my gpu it started producing errors. The clEnqueNDRangeKernel() started failing. My GPU was running really hot(max 88C) and I think this is the reason for the failure. Also the desktop becomes unusable for 20 minutes which is certainly very annoying. Hence something must be done to resolve these issues. Limiting the number of work groups helps in increasing system responsiveness and reduce temps but the performance drops drastically. Are there any ways to limit the number of compute units. ie if I have 10 CUs then only 9 CUs or less would be used for computation. Regards, Sayantan Content of type "text/html" skipped
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