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+# GPU Performance
+
+Doing performance work with GPUs is harder than with CPUs because of the
+asynchronous and massively parallel architecture.
+
+## Tools
+
+[PIX](https://devblogs.microsoft.com/pix/introduction/) - Can do
+timing of Direct3D calls. Works reasonably well with Firefox.
+
+NVIDIA PerfHUD - Last I checked required a special build to be used.
+
+NVIDIA Parallel Nsight - Haven\'t tried.
+
+AMD GPU ShaderAnalyzer - Will compile a shader and show the machine code
+and give static pipeline estimations. Not that useful for Firefox
+because all of our shaders are pretty simple.
+
+AMD GPU PerfStudio - I had trouble getting this to work, and can\'t
+remember whether I actually did or not.
+
+[Intel Graphics Performance Analyzers](http://software.intel.com/en-us/articles/intel-gpa/ "http://software.intel.com/en-us/articles/intel-gpa/")
+- Haven\'t tried.
+
+[APITrace](https://github.com/apitrace/apitrace "https://github.com/apitrace/apitrace")
+- Open source, works OK.
+
+[PVRTrace](http://www.imgtec.com/powervr/insider/pvrtrace.asp "http://www.imgtec.com/powervr/insider/pvrtrace.asp")
+- Doesn\'t seem to emit traces on android/Nexus S. Looks like it\'s
+designed for X11-based linux-ARM devices, OMAP3 is mentioned a lot in
+the docs \...
+
+## Guides
+
+[Accurately Profiling Direct3D API Calls (Direct3D
+9)](http://msdn.microsoft.com/en-us/library/bb172234%28v=vs.85%29.aspx "http://msdn.microsoft.com/en-us/library/bb172234(v=vs.85).aspx")
+Suggests avoiding normal profilers like xperf and instead measuring the
+time to flush the command buffer.
+
+[OS X - Best Practices for Working with Texture
+Data](http://developer.apple.com/library/mac/#documentation/GraphicsImaging/Conceptual/OpenGL-MacProgGuide/opengl_texturedata/opengl_texturedata.html "http://developer.apple.com/library/mac/#documentation/GraphicsImaging/Conceptual/OpenGL-MacProgGuide/opengl_texturedata/opengl_texturedata.html")
+- Sort of old, but still useful.