Messages in this thread | | | Date | Fri, 27 May 2011 13:33:54 -0600 | From | David Ahern <> | Subject | perf, H/W counters - ESX hosted VM |
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Has anyone successfully used perf within an ESX VM? dmesg shows a PMU is discovered:
dmesg | grep -i performance Performance Events: Nehalem/Corei7 events, Intel PMU driver.
yet data from it is nonsensical:
perf stat -v -- /tmp/a
task-clock-msecs: 20593318 20593318 20593318 context-switches: 2 20593318 20593318 CPU-migrations: 0 20593318 20593318 page-faults: 387 20593318 20593318 cycles: 10737418235 20593318 20593318 instructions: 10737418235 20593318 20593318 cache-references: 10737418235 20593318 20593318 cache-misses: 10737418235 20593318 20593318
Performance counter stats for '/tmp/a':
20.593318 task-clock-msecs # 0.988 CPUs 2 context-switches # 0.000 M/sec 0 CPU-migrations # 0.000 M/sec 387 page-faults # 0.019 M/sec 10737418235 cycles # 521403.022 M/sec 10737418235 instructions # 1.000 IPC 10737418235 cache-references # 521403.022 M/sec 10737418235 cache-misses # 521403.022 M/sec
0.020837863 seconds time elapsed
David
/tmp/a -- a step above 'sleep 1'
#!/bin/sh
declare -i i=0; declare -i sum=0; while [ $i -lt 1000 ] do sum=$((sum + i)) i=$((i+1)) done echo "sum $sum"
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