Is there anyway to read performance counters on OS X Mountain Lion?

Question

Shark, Apple\'s profiler which let you configure custom performance counters, is no longer supported in OSX Mountain Lion since it can\'t run a 32-bit kernel. Instruments.ap

Answer 1

Yes. It's there, but difficult to find and clumsy to use (ver.4.5).

• Launch Instruments.
• You are greeted by the Wizard
• Choose "Blank" template for OS X
• Press cmd+L to display the Library
• Add "Counters" instrument to your Instruments document
• Press cmd+shf+P -- you are presented with the PM Events floating window.
• Let's evaluate "Divide Operations executed" -- Add "Divide Operations executed" to the PM Events window's search field.
• Now set the "State" of "Divide Operations executed" to "Visible"
• Now back to the main document window, press cmd+I to display the info popover of the "Counters" instrument.
• Press the + button
• Set the new Counter's event to "Divide Operations executed"
• Begin sampling...
• End sampling...

You will see the results in Instruments' table columns. Of course, there are many events you could record -- So find the L1 cache events you are interested in and add them instead of divides.

Also be prepared for system freezes (one happened while writing this up).