xref: /external/autotest/client/tests/cyclictest

cyclictest -t 5 -p 80 -n -q -l 10

runs a test with 5 threads, stops after 10 loops and outputs:

T: 0 ( 2215) P:80 I:    1000 C:      10 Min:      31 Act:      33 Avg:      33 Max:      43
T: 1 ( 2216) P:79 I:    1500 C:      10 Min:      22 Act:      22 Avg:      36 Max:      61
T: 2 ( 2217) P:78 I:    2000 C:      10 Min:      27 Act:      33 Avg:      36 Max:      50
T: 3 ( 2218) P:77 I:    2500 C:      10 Min:      23 Act:      37 Avg:      38 Max:      59
T: 4 ( 2219) P:76 I:    3000 C:      10 Min:      26 Act:      48 Avg:      36 Max:      48

All numbers in micro seconds. You get the minimium, maximum and average latency for each thread.

I use this for automated regression testing. 

The -v option outputs:

       0:       0:       0
       0:       1:      45
       0:       2:      41
       0:       3:      31
       0:       4:      31
       0:       5:      34
       1:       0:       0
       1:       1:      29
       1:       2:      33
       1:       3:      33
...
where the first column is the thread, the second column is the loop
counter and the third is the latency value for this step. You can use
this for your own statistics or for latency distribution plots.

	tglx