AnsweredAssumed Answered

performance counter, kernel occupancy inconsistent with Southern Island (Linux)

Question asked by cguenther on Dec 16, 2012
Latest reply on Dec 18, 2012 by chesik

dear amd dev team,


i am using ubuntu 10.04 x64, amd APP SDK 2.8 and the AMD Catalyst Driver 12.10.


Now i tried to profile my OpenCL kernel with the CodeXL 1.0 and i get some discrepancies of the measured values. See the attached figures:


You can see that the VGPR and SGPR usage of the kernel occupancy tab is not consistent to the values of the performance counter tab. So which ones i should trust?


Also i got  VALUUtilization, CacheHit and MemUnitStalled values, which are far away from the 100% border. Are they per mille instead of per cent, or why they are greater than 100%?