perf stat -B dd if=/dev/zero of=/dev/null count=1000000
1000000+0 records in
1000000+0 records out
512000000 bytes (512 MB) copied, 0.956217 s, 535 MB/s
Performance counter stats for 'dd if=/dev/zero of=/dev/null count=1000000':
5,099 cache-misses # 0.005 M/sec (scaled
from 66.58%)
235,384 cache-references # 0.246 M/sec (scaled
from 66.56%)
9,281,660 branch-misses # 3.858 % (scaled
from 33.50%)
240,609,766 branches # 251.559 M/sec (scaled
from 33.66%)
1,403,561,257 instructions # 0.679 IPC (scaled
from 50.23%)
2,066,201,729 cycles # 2160.227 M/sec (scaled
from 66.67%)
217 page-faults # 0.000 M/sec
3 CPU-migrations # 0.000 M/sec
83 context-switches # 0.000 M/sec
956.474238 task-clock-msecs # 0.999 CPUs
0.957617512 seconds time elapsed
Hi, all. I get a data from the
page:https://code.google.com/p/kernel/wiki/PerfUserGuide,
Can anyone explain to me the meaning of "scaled from", and from which
get the 66.58% or 33.50%??
Best wishes.
Yours,
Wang Peipei
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