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{{Short description|Software library for microprocessor metrics}}
In [[computer science]], '''Performance Application Programming Interface (PAPI)''' is a portable [[application programming interface|interface]] (in the form of a [[library (computing)|library]]) to [[hardware counter|hardware performance counters]] on modern [[microprocessor]]s. It is being widely used to collect low level performance metrics (e.g. [[Instruction (computer science)|instruction]] counts, [[clock cycle]]s, [[cache miss]]es) of computer systems running [[UNIX]]/[[Linux]] [[operating system]]s.
PAPI provides predefined high level hardware events summarized from popular processors and direct access to low level native events of one particular processor. Counter [[multiplexing]] and [[arithmetic_overflow|overflow]] handling are also supported.
[[Operating system]] support for accessing hardware counters is needed to use PAPI.
For example, prior to 2010, a [[Linux Since Linux version 2.6.32, and PAPI 2010 releases, PAPI can leverage the existing perf subsystem in Linux, and thus does not need any out of tree driver to be functional anymore.
Supported Operating Systems and requirements are listed in the official repository's documentation [https://bitbucket.org/icl/papi/raw/0fdac4fc7f95f0ac8039e431419a5133088911af/INSTALL.txt INSTALL.txt].
==See also ==
* [[Profiling (computer programming)|Performance analysis]]
==Further reading==
==External links ==▼
* [https://www.netlib.org/utk/people/JackDongarra/PAPERS/papi-journal-final.pdf A Portable Programming Interface for Performance Evaluation on Modern Processors] / International Journal of High Performance Computing Applications archive Volume 14 Issue 3, August 2000, pages 189–204 [[doi:10.1177/109434200001400303]] {{in lang|en}}
* [http://icl.cs.utk.edu/papi/index.html Official site]▼
* Dongarra, Jack, et al. "[https://www.netlib.org/utk/people/JackDongarra/PAPERS/papi-linux.pdf Using PAPI for hardware performance monitoring on Linux systems]" // Conference on Linux Clusters: The HPC Revolution. Vol. 5. Linux Clusters Institute, 2001.
* Philip Mucci, [https://www.drdobbs.com/tools/performance-monitoring-with-papi/184406109 Performance Monitoring with PAPI] / Dr.Dobbs, June 1, 2005
* [https://web.archive.org/web/20160303180716/http://berrendorf.inf.fh-brs.de/lehre/abschlussarbeiten/arbeiten/2009_Thesis_Fabian_Gorsler.pdf Development of a PAPI Backend for the Sun Niagara 2 Processor], 2009
{{compu-library-stub}}
[[Category:Profilers]]
[[Category:Software optimization]]
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