Hi list,
I am studying multi-core scheduling and using Linux Perf as a tool for
comparing different scheduling techniques. So, I usually run a particular
multi-threaded program with different scheduling and obtain some
information when the application is running such as cycles, bus-cycles,
cache-misses and so on. All tests has been done by a Intel Core 2 Duo +
Ubuntu 14.04.
I have encountered with wonderful results. In fact, I ran a parallel
program two times with different scheduling. While cycles, bus-cycles and
miss-rate are in test1 are less than those of test2, elapsed time of test1
is more than that of test2. I wonder whether you could tell me why this
happened? The obtained results were shown at following:
Test1:
# started on Sat Oct 4 18:19:55 2014
Performance counter stats for 'system wide' (150 runs):
1,398,429,117 cycles ( +- 0.13% ) [28.49%]
139,439,143
bus-cycles ( +- 0.12% )
[28.77%]
1,746,982,529 instructions # 1.25 insns per
cycle ( +- 0.09% ) [43.18%]
8,596,204
cache-references ( +- 0.45% )
[43.33%]
407,815 cache-misses # 4.744 % of all cache
refs ( +- 1.01% ) [42.79%]
15,690,104
r2F77 ( +- 0.14% )
[28.51%]
1,123,667,581
rC07D ( +- 0.21% )
[28.15%]
0.365244759 seconds time
elapsed ( +- 0.16% )
Test2:
# started on Sat Oct 4 18:34:37 2014
Performance counter stats for 'system wide' (150 runs):
1,403,443,950 cycles ( +- 0.09% ) [28.24%]
140,040,576
bus-cycles ( +- 0.12% )
[28.70%]
1,752,745,189 instructions # 1.25 insns per
cycle ( +- 0.10% ) [43.13%]
8,557,756
cache-references ( +- 0.43% )
[43.35%]
412,481 cache-misses # 4.820 % of all cache
refs ( +- 1.16% ) [43.01%]
15,728,789
r2F77 ( +- 0.16% )
[28.53%]
1,119,849,348
rC07D ( +- 0.18% )
[28.21%]
0.363744760 seconds time
elapsed ( +- 0.14% )
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