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From: Philippe W. <phi...@sk...> - 2015-03-09 23:17:58
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On Mon, 2015-03-09 at 14:22 -0300, Andres Tiraboschi wrote: > I'm trying to do a tool for valgrind and i want to measure the time > that takes to do a malloc for example, but milliseconds are not > enough. > There is read_millisecond_timer in pub_tool_libproc.h but I'm > wondering if maybe there is another function that can do the same but > in nanoseconds. > Regards, Andres Valgrind slows down a lot the execution of instructions, and changes a lot how the process runs (e.g. thread scheduling is *heavily* impacted). So, it is not very clear to me what is the purpose of measuring very precisely the execution of some functions. Maybe you could describe more in details what you are trying to do? You might achieve 'measuring' precisely by using cachegrind or callgrind, and have an idea of the absolute time needed using a conversion from nr instructions/cache misses/... to execution time. Philippe |
|
From: Andres T. <and...@ta...> - 2015-03-09 17:22:52
|
I'm trying to do a tool for valgrind and i want to measure the time that takes to do a malloc for example, but milliseconds are not enough. There is read_millisecond_timer in pub_tool_libproc.h but I'm wondering if maybe there is another function that can do the same but in nanoseconds. Regards, Andres |