Hi, The links provided gives description about the perf tool. As i mentioned before, i was interested in the significance of the following:
1. irqs/sec 2. samples 3. pcnt A brief explanation will suffice, as i am also looking into the code of perf top. Thanks Ankur On Wed, Jul 13, 2011 at 9:10 PM, Vipin <[email protected]> wrote: > ** > Hi, > > I think this should suffice > https://perf.wiki.kernel.org/index.php/Tutorial#Live_analysis_with_perf_top > > Rest of the information is archived here > http://lxr.linux.no/linux+v2.6.39/tools/perf/Documentation/ > > The value of 1000Hz means the frequency at which the system's timer is > programmed to interrupt the kernel. It is a kernel configurable option. > > Thanks > Vipin > > On 07/13/2011 10:59 AM, ankur dwivedi wrote: > > Hi, > > My question is regarding the basic use of perf top command in linux. > > The following is the snap shot of running a "*perf top -e cache-misses*" > command from console: > > > ---------------------------------------------------------------------------------------------------------------------------------------------------------------------- > PerfTop: 76* irqs/sec* kernel:14.5% exact: 0.0% [1000Hz > cache-misses], (all, 12 CPUs) > > ---------------------------------------------------------------------------------------------------------------------------------------------------------------------- > > *samples* *pcnt* function DSO > _______ _____ _______________________ > ____________________________________ > > 48.00 36.9% get_page_from_freelist > [kernel.kallsyms] > 12.00 9.2% JS_CallTracer > /usr/lib/xulrunner-1.9.2/libmozjs.so > 12.00 9.2% JS_TraceChildren > /usr/lib/xulrunner-1.9.2/libmozjs.so > 8.00 6.2% dso__find_symbol > /usr/bin/perf > 7.00 5.4% native_flush_tlb_single > [kernel.kallsyms] > 6.00 4.6% _int_malloc /lib/libc-2.12.90.so > > > > What i want to know is the significance of different parameters here which > are the following: > 1. irqs/sec > 2. samples > 3. pcnt > > It also shows a value of 1000Hz. what is the meaning of that. > > I searched regarding these in the internet, but was unable to find a good > explanation > > Thanks > Ankur > > > > _______________________________________________ > Kernelnewbies mailing > [email protected]http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > > > -- Thanks Ankur Dwivedi Cavium Networks Inc Office Number - +1 650 623 3643
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