ROCm 2.7 - PRP performance drop

[valeriob01]

warning: do not update to ROCm 2.7 - performance is poor (again I would say), basically radeon VII timing went from 908 to 990 us/sq.

[valeriob01]

Here I am puzzled by the fact that the performance drop is present with an upgrade to version 2.7, but absent with a new installation.

[preda]

Indeed the difference between fresh install/upgrade is very puzzling. Let me know if you find more about that. In the meantime, ROCm is doing a bad job on the performance front IMO, they must be busy with something else. What I do is: I've extracted the opencl library from an old version of ROCm that was working ok (2.2?) and keep using that with LD_LIBRARY_PATH, i.e. using the OpenCL compiler from an old ROCm version.

[valeriob01]

Yes, ROCm is not improving performance, my opinion is that they work on new features now.
I have extracted version 2.2 and modified LD_LIBRARY_PATH. Recovered good speed.
Running the rocm.sh script gives an empty LD_LIBRARY_PATH (I think it loads from a default location then), issuing the command on the prompt works, thus I think to put the export line inside my own script.