<div dir="ltr">It's an Intel HD 4400. Here's some more information from GpuCapsViewer:<div><div><div><br></div><div>- Windows 8.1 64-bit build 9600</div><div>- OpenGL info:</div><div> - GL_VERSION: 4.3.0 - Build 10.18.14.4170 (# ext: 208)</div><div> - GL_RENDERER: Intel(R) HD Graphics 4400</div><div> GPU 1 - Intel(R) HD Graphics Family</div><div>- GPU: Haswell</div><div>- Device ID: 8086- A16</div><div>- Subvendor: Unknown (1414- 5)</div><div>- Driver version: 10.18.14.4170 ig75icd64.dll</div><div>- Bios version: Intel Video BIOS</div><div>- GPU memory size: 1024MB</div><div>- GPU cores: 40</div><div>- GPU Texture units: 1</div><div>- TDP: 84 Watts</div><div><br></div></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Oct 30, 2015 at 10:00 PM, Nigel Stewart <span dir="ltr"><<a href="mailto:nigels.com@gmail.com" target="_blank">nigels.com@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><p dir="ltr">Rafael,</p>
<p dir="ltr">What specific GPU is in the Surface Pro? At a fine granularity timing tends to vary due to threading, contention and threading.</p>
<p dir="ltr">- Nigel</p>
<div class="gmail_quote"><div><div class="h5">On Oct 31, 2015 2:16 AM, "Rafael Spring" <<a href="mailto:rafael@dotproduct3d.com" target="_blank">rafael@dotproduct3d.com</a>> wrote:<br type="attribution"></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5"><div dir="ltr">Hello,<div><br></div><div>we are currently doing some performance testing of our GPU code and have found that <span>apitrace</span> (a tool we really appreciate!) contains a profiling tool that works with OpenGL.</div><div><br></div><div>However
we are a bit unsure how to interpret the results. According to the
Profile Results a lot of GPU time seems to be spent in draw calls of a
few simple shaders that don't draw a lot of pixels, whereas the complex
shaders that draw lots of pixels seem to be fairly quick. Also some of
the GPU draw call times seem to vary by orders of magnitude for the same
shader and operation (i.e. one call takes ~20 us and the next draw
call, performing the exact same operation with the same shader but
possibly to a different part of the framebuffer, takes 10000 us).</div><div>We
suspect the execution times aren't always true compute times but may
contain stall times. Another theory is that some of the draw call times
are actually just scheduling times and the real computation time ends up
counting towards another draw call timing, when a batch of operations
gets executed.</div><div><br></div><div>Any insight into how to
interpret the Profile Results and how to derive optimization insight
from it would be greatly appreciated.</div><div><br></div><div>For testing we are currently using a MS Surface Pro 3 tablet running Windows 8.1.</div><div><br></div><div>Thanks,</div><div>Rafael</div><br clear="all"><br>-- <br><div><div dir="ltr"><span style="color:rgb(136,136,136)">Rafael Spring</span><div style="color:rgb(136,136,136)">CTO, Co-Founder</div><div style="color:rgb(136,136,136)">DotProduct LLC / DotProduct GmbH</div><div style="color:rgb(136,136,136)"><a href="mailto:rafael@dotproduct3d.com" style="color:rgb(17,85,204)" target="_blank">rafael@dotproduct3d.com</a></div><div style="color:rgb(136,136,136)"><a href="http://www.dotproduct3d.com/" style="color:rgb(17,85,204)" target="_blank">www.dotproduct3d.com</a></div><div style="color:rgb(136,136,136)">m: <a href="tel:%2B49%201525%203822738" value="+4915253822738" target="_blank">+49 1525 3822738</a></div><div style="color:rgb(136,136,136)">@DotProduct3D</div></div></div>
</div>
<br></div></div>_______________________________________________<br>
apitrace mailing list<br>
<a href="mailto:apitrace@lists.freedesktop.org" target="_blank">apitrace@lists.freedesktop.org</a><br>
<a href="http://lists.freedesktop.org/mailman/listinfo/apitrace" rel="noreferrer" target="_blank">http://lists.freedesktop.org/mailman/listinfo/apitrace</a><br>
<br></blockquote></div>
</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><span style="color:rgb(136,136,136)">Rafael Spring</span><div style="color:rgb(136,136,136)">CTO, Co-Founder</div><div style="color:rgb(136,136,136)">DotProduct LLC / DotProduct GmbH</div><div style="color:rgb(136,136,136)"><a href="mailto:rafael@dotproduct3d.com" style="color:rgb(17,85,204)" target="_blank">rafael@dotproduct3d.com</a></div><div style="color:rgb(136,136,136)"><a href="http://www.dotproduct3d.com/" style="color:rgb(17,85,204)" target="_blank">www.dotproduct3d.com</a></div><div style="color:rgb(136,136,136)">m: +49 1525 3822738</div><div style="color:rgb(136,136,136)">@DotProduct3D</div></div></div>
</div>