On 05/30/2012 03:40 PM, Peter Zijlstra wrote:
On Wed, 2012-05-30 at 13:20 +0200, Peter Zijlstra wrote:$ perf stat -e cycles --repeat 100 perf bench sched messaging -p -g 100 48,826,146,710 cycles # 2.470 GHz ( +- 0.17% ) 2.149005270 seconds time elapsed ( +- 0.12% )A repeat count of 250 dropped it down to: 2.144582157 seconds time elapsed ( +- 0.08% ) Also, if you're poking at the context switch path, something like: $ taskset 1 perf stat -e cycles --repeat 10 perf bench sched pipe -l 100000 gives a good number and is usually more stable than hackbench.
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