Hi @ll,

I used OProfile to sample CYCLE on AMD Opteron 2.0GHz.

opcontrol --event=CPU_CLK_UNHALTED:3001 --image=gzip.exe

The sampling result is 902,645.   The execution time of gzip.exe is 9.281s (linux time command).

Estimated execution time: sampling result * sampling interval / CPU frequency
902,645 * 3001 / 2,000,000,000 = 1.35s.  But this result is very different from 9.281s.

BTW, when I changed event count to 1,0001 the sampling result is 752,647. And changed to 10,0001, the result is 167,612.
Why does not the sampling result scale with the event count?

Paul Yuan (袁鹏)