Date: Sun, 13 Jan 2013 12:23:39 -0200 From: Claudio André <claudioandre.br@...il.com> To: john-dev@...ts.openwall.com Subject: Re: Changes to common-opencl.c Em 12-01-2013 23:48, Lukas Odzioba escreveu: > In my opinion we should have some kind of "framework" that can handle > multigpu support itself. Some time ago I tried to move function > finding "best" GWS/LWS to common-opencl but it didn't ended well and > now we still have bad situation where almost each format have a lot of > copy pasted code for doing that. When it comes to multigpu there will > be more copy pasting and this is not a good thing. Ideally we should > be able to run code with different in speed gpus and have almost no > speed regression (I mean that sum of speeds from testing gpus > separately should be equal multigpu mode). This is not easy at all > especially in one thread, but less problematic than the same thing in > cuda. Maybe it will require some changes in fmt_ interface, or could > be done by some "task manager" working inside crypt() function to > divide data and gather results from gpus. I agree, but I need to have a good undestanding about what is really necessary to suggest / change. Now, only Sayantan produced muti-gpu code. So, I intend to create the possibility and latter create something multi-gpu in order to see what is possible/necessary. My fellings is that without core modifications we will have some speed regression (as you said in ). Better than nothing but not perfect. For now, I'm only handling better a multi-gpu environment. Using only one thread, the format creator still has to figure out which LWS/GWS pick in order to result in . Maybe using Sayantan work and your idea in opencl_find_best_workgroup() is enought. Now, I have no idea if it is true.  - "have almost no speed regression ('you' mean that sum of speeds from testing gpus separately should be equal multigpu mode)" > >> Problems: >> - hot-plug is not going to be handled. Well, it is not handled now too. > What do you mean by hotplug? Adding gpus while john is runnig? Exactly. Claudio
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