On Sat, Oct 4, 2014 at 5:54 PM, Hamid Reza Khaleghzadeh <khaleghza...@gmail.com> wrote: > 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?
I suggest you run your tests for much longer (>60s). Here you don't even have a second, so you have also capturing overhead. > 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% ) > > ------------------------------------------------------------------------------ > Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer > Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS Reports > Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper > Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer > http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk > _______________________________________________ > perfmon2-devel mailing list > perfmon2-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/perfmon2-devel > ------------------------------------------------------------------------------ Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS Reports Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk _______________________________________________ perfmon2-devel mailing list perfmon2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/perfmon2-devel
