Hi Chenggang, Do you use libunwind for either sampling or one-shot stack tracing? For sampling Perf Events interface can be helpful for you.
For one shot have a look at this tool: https://github.com/tbricks/tbstack Some numbers on Xeon(R) CPU E5-2690 0 @ 2.90GHz, for one thread: http://lists.nongnu.org/archive/html/libunwind-devel/2014-10/msg00008.html Note that I measured time to freeze process and collect data, unwinding is completed afterwards. — Vladimir > On 22 Nov 2014, at 12:05, Chenggang <[email protected]> wrote: > > Hi: > I am a user of libunwind. I am developing a profiling system, "Bianque". > I use libunwind to unwind the stack on the target machine. But the time > cost is too expensive. > While the layers of call chain is 130 and the stack size is 1MB, we need > 3.8 milliseconds to unwind it. > My CPU is Xeon(R) CPU E5-2430 0 @ 2.20GHz. > Is this cost normal? > > Regards > Chenggang > > > > _______________________________________________ > Libunwind-devel mailing list > [email protected] > https://lists.nongnu.org/mailman/listinfo/libunwind-devel _______________________________________________ Libunwind-devel mailing list [email protected] https://lists.nongnu.org/mailman/listinfo/libunwind-devel
