Hi,
what's the difference between the two events task-clock and cpu-clock?
I couldn't find any information that tells me the difference.
Why does the event modifier 'u' has no effect on these two software events?
Cheers,
Andreas
Here is the example:
$ time perf stat -e
'{task-clock,task-clock:u,cpu-clock,cpu-clock:u,instructions,instructions:u}'
dd if=/dev/zero of=/dev/null count=10000000
10000000+0 records in
10000000+0 records out
5120000000 bytes (5.1 GB) copied, 2.99018 s, 1.7 GB/s
Performance counter stats for 'dd if=/dev/zero of=/dev/null count=10000000':
2989.907827 task-clock # 0.999 CPUs utilized
2989.907827 task-clock:u # 0.999 CPUs utilized
2989.992015 cpu-clock
2989.999305 cpu-clock:u
14,525,479,811 instructions # 0.00 insns per cycle
3,130,315,989 instructions:u # 0.00 insns per cycle
2.991410383 seconds time elapsed
real 0m3.001s
user 0m0.723s
sys 0m2.270s
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