What is "perf"

abbr. 1 (context philately English) perforation or perforated. When followed by a number, eg, ''perf 14'', this indicates the number of perforations per two centimetres. 2 (context grammar English) (abbreviation of perfective English)

'''Perf ''' is a river of Hesse, Germany.

Perf may refer to:

• Perf, a river of Hesse, Germany
• perf, a performance counter program for 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 profiling of the entire system (both kernel and userland code).

It supports hardware performance counters, tracepoints, software performance counters (e.g. hrtimer), and dynamic probes (for example, kprobes or uprobes). In 2012, IBM recognized perf (along with OProfile) as one of the two most commonly used performance counter profiling tools on Linux.