From: Paul Y. <yin...@gm...> - 2009-08-20 14:38:56
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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? -- Regards, Paul Yuan (袁鹏) |