- November 19, 2014 at 2:46 am #31878
I am using JNI(Java Native Interface) to access PVRScope, in order to access the counter values. The whole 3D program is written in Jave using OpenGL ES 2.0. I open a new thread in Java to regularily sample the PVRScope. I have tried to sample it for different time cycles like 1ms, 2ms, 4ms, 10ms, 16ms, 20ms.
However, all values of counter I got seems random.
Here is a group(active group 0) of data i got:
Group -1: Frame time: 1.1171633
Group -1: Frames per second (FPS): 0.8951243
Group -1: GPU task load: 2D: 57434.145
Group -1: GPU task load: Compute: 57434.145
Group -1: GPU task load: Renderer: 57462.2
Group -1: GPU task load: Tiler: 57459.887
Group -1: GPU task time per frame: 2D: 641.6332
Group -1: GPU task time per frame: Compute: 641.6332
Group -1: GPU task time per frame: Renderer: 641.9466
Group -1: GPU task time per frame: Tiler: 641.9208
Group -1: GPU task time: 2D: 2566.5327
Group -1: GPU task time: Compute: 2566.5327
Group -1: GPU task time: Renderer: 2567.7864
Group -1: GPU task time: Tiler: 2567.683
Group -1: SPM: 0.0
Group 0: ISP load: 0.27483493
Group 0: Shader clock cycles per pixel: 1.0891527
Group 0: Shader clock cycles per vertex: 42.2029
Group 0: Shader load: Pixel: 0.49096373
Group 0: Shader load: Vertex: 0.0014539474
Group 0: Tiler load: 0.35116774
Group 0: Vertices per frame: 69.0
Group 0: Vertices per second: 61.76358
It seems all the data make no sense. If I run the same program again, the data would be different. And some data such as Shader clock cycles per pixel & Shader clock cycles per vertex is stable and make sense.
What is wrong with PVRScope? Why can PVRScopeExample get the correct data but I cannot.
My device is Samsung Galaxy S4 with PowerVR SGX 544MPNovember 20, 2014 at 2:04 pm #39141
PVRScope returns the average counter values since the previous sampling period. I would recommend reading our Getting started with PVRScopeStats blog post to familiarise yourself with the behaviour of PVRScope’s counter retrieval process.
We are planning to release the source code of our PVRMonitor utility soon. I’ll update this discussion when that source code is live.
JoeNovember 20, 2014 at 5:26 pm #39142