I had seen a screenshot of this on imagechan and assumed it was fake. I just tried it, and indeed it is real:
Monthly Archives: November 2009
Instruments – the Mac version of perfmon/dtrace/strace
I had never heard of this before, but if you’re looking for the equivalent of perfmon on your Mac, or trying to troubleshoot a misbehaving process, they have a sharp-looking GUI tool to help with it called Instruments.