Why do I sometimes get all hw counter delta zero about gator

[bengaineyarm]

Hi;

Are you trying to modify gatord to print out CPU utilization stats manually? If you, you might want to look at https://github.com/ARM-software/HWCPipe instead which is a stand-alone library for collecting Mali PMU counters and integrating them into your application. Currently it only includes PMU counters, but we are in the process of adding derived metrics such as this.

Regarding the issue you are seeing, its hard to say without further information; but given the lines of code you have modified, it looks like you are using quite an old version of gatord, some one place to start might be to update to the latest version, or switch to using hwcpipe and then retrying.

The calculation looks reasonable. For reference, we publish guides for each of the different GPUs PMU counters; for example for the G77 you have https://developer.arm.com/documentation/102730/0103/GPU-activity