On Sun, Mar 18, 2012 at 06:27:53PM +0530, shashank rachamalla wrote: > 2012/3/18 Gleb Natapov <gleb@xxxxxxxxxx>: > > On Sun, Mar 18, 2012 at 03:48:53PM +0530, shashank rachamalla wrote: > >> > >> CPU: Core 2, speed 2200.19 MHz (estimated) > >> Counted CPU_CLK_UNHALTED events (Clock cycles when not halted) with a > >> unit mask of 0x00 (Unhalted core cycles) count 100000 > >> CPU_CLK_UNHALT...| > >> samples| %| > >> ------------------ > >> 1 100.000 /no-vmlinux > >> > >> > > What happens if you run "perf stat -e cycles a.out"? > > This is what i get when I run "perf stat ./a.out" ( with --cpu host > passed in qemu-kvm ) > > Performance counter stats for './a.out': > > 954.925996 task-clock-msecs # 0.955 CPUs > 23 context-switches # 0.000 M/sec > 0 CPU-migrations # 0.000 M/sec > 93 page-faults # 0.000 M/sec > 2110635735 cycles # 2210.261 M/sec > 901816391 instructions # 0.427 IPC > 247677 cache-references # 0.259 M/sec > 15044 cache-misses # 0.016 M/sec > > 0.999846560 seconds time elapsed > > This is without --cpu host ( Note that only software events get monitored ) > > Performance counter stats for './a.out': > > 913.826372 task-clock-msecs # 0.990 CPUs > 13 context-switches # 0.000 M/sec > 0 CPU-migrations # 0.000 M/sec > 93 page-faults # 0.000 M/sec > <not counted> cycles > <not counted> instructions > <not counted> cache-references > <not counted> cache-misses > > 0.923182044 seconds time elapsed > > I guess things are working fine with perf. But why not with oprofile ? > Looks like it. I never tried oprofile. Will try to reproduce your problem and see what oprofile is doing. -- Gleb. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
