Record values of Performance Monitor Counters (PM

问题:

In Xcode's Instruments, there is a tool called Counters that exposes low-level counter information provided by the CPU, such as the number of instructions executed or number of cache misses:

This is similar to the Linux syscall perf_event_open introduced in Linux 2.6.32. On Linux, I can use perf_event_open then start/stop profiling around the section of my code I'm interested in. I'd like to record the same type of stats on OS X: counting the instructions (etc.) that a certain piece of code takes, and getting the result in an automated fashion. (I don't want to use the Instruments GUI to analyze the data.)

Are there any APIs that allow this (ex: using dtrace or similar)? From some searching it sounds like the private AppleProfileFamily.framework might have the necessary hooks, but it's unclear how to go about linking to or using it.

回答1:

In GNU/Linux I use Intel's PCM to monitor CPU utilization. I'm not sure if this works fine on OSX, but as far as I know the source-code is including the MacMSRDriver directory. I have no any OSX device, never test it anyway.

In case this source compiled on your device, Just run:

pcm.x -r -- your_program your_program_parameter

or if you want advanced profiling, use pcm-core.x instead or you can build your own code based on pcm-core.cpp