<div dir="ltr">OpenCL is only enabled by default for AMD cards. In order to force enable it for your platform you can set CYCLES_OPENCL_TEST environment variable to 'all'. You can also use CYCLES_OPENCL_SPLIT_KERNEL_TEST=1 to test split kernel work.<div><br></div><div>For NVidia cards OpenCL will not be any faster tho, but much slower instead.</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Dec 11, 2015 at 8:00 PM, Mohamed Sakr <span dir="ltr"><<a href="mailto:3dsakr@gmail.com" target="_blank">3dsakr@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">are you sure that tile size is correct? if tile size is 16 or 32, CPU will be faster than GPU, make tile size 256 x 256 for CUDA</div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Dec 11, 2015 at 12:47 PM, Guillaume Rouault <span dir="ltr"><<a href="mailto:guillaume.rouault.fx@gmail.com" target="_blank">guillaume.rouault.fx@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">oups, I should have tested it on the same scene ... actually it's not that fast at all ... I have a core i7-2600k 3.40GHz , and it computes with cycles somewhere around 30% faster than my Nvidia <span style="font-size:12.8px">GTX 580. I don't know if that is normal. Are there some benchmarks somewhere ?</span><div><span style="font-size:12.8px"><br></span></div><div><span style="font-size:12.8px">It makes me think about another thing I don't understand : </span></div><div><span style="font-size:12.8px">Is it an "either or" situation with Cuda and OpenCL ? (i.e when typing </span></div><div><span style="font-size:12.8px"> cycles.exe --help</span></div><div><span style="font-size:12.8px">devides listed are :</span></div><div><span style="font-size:12.8px">-cpu</span></div><div><span style="font-size:12.8px">-opencl</span></div><div><span style="font-size:12.8px">-multi</span></div><div>yet, on my system listed devices are:</div><div>-cpu</div><div>-cuda</div><div><br></div><div>How do I get access to openCL capabilities ?</div><div>And could it be faster than Cuda ? </div><div><br></div><div>Guillaume</div><div><br></div><div><br></div><div class="gmail_extra"><div class="gmail_quote">On Wed, Dec 9, 2015 at 12:23 PM, Guillaume Rouault <span dir="ltr"><<a href="mailto:guillaume.rouault.fx@gmail.com" target="_blank">guillaume.rouault.fx@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Thank you so much <span style="font-size:12.8px">Nathan </span><div><span style="font-size:12.8px">I copy all the .cubin files in a lib directory along cycles.exe , ( I wouldn't have guessed it in a million years :) ) and it works nicely. I have a pretty "crappy" GTX 580, and it's already pretty fast. </span></div><div><span style="font-size:12.8px"><br></span></div><div><span style="font-size:12.8px">thanks again</span></div><span><font color="#888888"><div><span style="font-size:12.8px"><br></span></div><div><span style="font-size:12.8px">Guillaume</span></div></font></span></div><div><div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Dec 9, 2015 at 11:57 AM, Nathan Letwory <span dir="ltr"><<a href="mailto:nathan@mcneel.com" target="_blank">nathan@mcneel.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">-----BEGIN PGP SIGNED MESSAGE-----<br>
Hash: SHA256<br>
<br>
Hi,<br>
<br>
You probably need to ensure cycles.exe can find the lib/ directory<br>
containing the .cubin files. AFAIK by default that'd be a lib/<br>
directory in the directory where your cycles.exe is.<br>
<br>
/Nathan<br>
<span><br>
On 09/12/2015 12:51, Guillaume Rouault wrote:<br>
> Hi everyone, I have successfully compile a working version of<br>
> cycles. using last availaible sources. I can render the examples<br>
> scenes, no problems, runs fine.<br>
><br>
> But when I type : cycles.exe --list-devices I can only see my cpu.<br>
> Does that mean there something wrong the compilation process ?<br>
<br>
</span>- --<br>
Nathan Letwory<br>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div><span style="color:rgb(102,102,102)">With best regards, Sergey Sharybin</span></div></div>
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