[Linux] perf (sometimes called `Perf Events` or perf tools, originally `Performance Counters for Linux`, PCL) is a performance analyzing tool in Linux, available from Linux kernel version 2.6.31. Userspace controlling utility, named perf, is accessed from the command line and provides a number of subcommands; it is capable of statistical pr... Found on http://en.wikipedia.org/wiki/Perf_(Linux)