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Date: Sun, 13 Jan 2013 03:14:20 +0100
From: magnum <>
Subject: Re: Changes to common-opencl.c

On 13 Jan, 2013, at 2:48 , Lukas Odzioba <> wrote:
> 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.

On the countrary, it ended up very well and most formats are using your shared function for finding out LWS! Actually I am not aware of any format that enumerates LWS itself - the ones not using your function are simply picking a fixed value that works fine in all situations. Maybe some of Sayantan's formats have a local function but that is because of his early multi-gpu support as far as I can tell.

Having said that, I have plans for using a private find_best_lws() for my split-kernel formats because they should do this enumeration with a lot lower iteration count than normal. I do GWS enumeration that way, and it speeds things up a great deal. Unfortunately I can't see any way to have a shared function support that.


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