<div dir="ltr"><div>Hi,</div><div>There is no clear rule on which is the best value. Doing it projection by projection is slower than doing it a few projections at a time because this is making a more optimal use of cache memory. However, cache memory is limited so it is not surprising that the performances don't increase indefinitely. The best is to test a few values to check which is the best one.</div><div>Best regards,</div><div>Simon</div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Tue, Mar 18, 2025 at 1:44 PM Anshika G <<a href="mailto:Anshika.G@panaceamedical.com">Anshika.G@panaceamedical.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg-4984618050917560024"><div lang="EN-IN" style="overflow-wrap: break-word;"><div class="m_-4984618050917560024WordSection1"><p class="MsoNormal"><span lang="EN-US">Hi everyone,<u></u><u></u></span></p><p class="MsoNormal">While going through the RTK installation documentation, I came across the RTK_CUDA_PROJECTIONS_SLAB_SIZE parameter, which can be configured during the CMake process. This parameter defines the number of projections processed simultaneously during CUDA processing, with the default value set to 16.<u></u><u></u></p><p class="MsoNormal">My understanding is that increasing this value should, in theory, reduce the overall runtime of the FDK reconstruction when using CUDA. However, I tried increasing it to 32 and 64, but observed no noticeable improvement in runtime. I’m using an NVIDIA Quadro RTX 6000 GPU.<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">Has anyone else experimented with this parameter or can provide insight into why changing the value doesn't seem to affect performance? <u></u><u></u></p><p class="MsoNormal">Any suggestions or guidance would be appreciated!<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">Thank you!<u></u><u></u></p><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p></div></div>_______________________________________________<br>
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