Current PAPI Software and Patches
PAPI 5.4.3 release

PAPI 5.4.3 is now available.  

This release includes some new implementations of components and tools, some general enhancements, and a number of bug fixes.

New Implementations:

  • libmsr component: Using LLNL's libmsr library to access Intel RAPL (Running Average Power Limit) library adds power capping abilities to PAPI.
  • CUDA PC sampling: A new standalone CUDA sampling tool (papi_cuda_sampling) has been added to the CUDA component (components/cuda/sampling/) and can be used as a preloader to perform PC sampling on Nvidia GPUs which support the CUPTI sampling interface (e.g. Maxwell).
  • ARM Cortex A53 support: Event definitions added.


  • Added Haswell-EP uncore support
  • Initial Broadwell, Skylake support
  • Added a general CUDA example (components/cuda/test) that uses LD_PRELOAD to attach to a running CUcontext.
  • Added "-check" flag to papi_avail and papi_native_avail to test counter availability/validity, unifying previous flags.

Information about the bug fixes can be found in the release notes and the ChangeLogP543.txt documents.

Last but not least, a special Thank You goes out to all our collaborators and contributors!  This project would not be successful without your help!

papi-5.4.3.tar.gz   Download View License

Announcing PAPI 5.4.1

PAPI 5.4.1 is now available. This is a minor release with a major rewrite of the CUDA component as well as several other enhancements and bug fixes.

This release provides CUDA 6.5 support for multiple GPU devices and multiple CUDA contexts.
There have been several other bug fixes and enhancements:

New Platforms:

  • Updated support for Intel Haswell and Haswell-EP
  • Added ARM Cortex A7
  • Added ARM 1176 CPU (original Raspberry Pi)


  • Enhance PAPI preset events to allow user defined events.
        User defined events are set up via a user event definition file.
  • New test demonstrating attaching an eventset to a single CPU rather than a thread.
  • Use the term "event qualifiers" instead of "event masks" to clarify understanding.
  • Added pkg-config support to PAPI. 

Bug Fixes:

  • Fixed lustre segfault bug in lustre component.
  • Fixed compilation in the absence of a Fortran compiler.
  • Fixed bug in krental_pthreads ctest to join threads properly on exit.
  • Fixed bug in perf_events where event masks were not getting cleared properly.
  • Fixed memory leak bug in perf_events.

More details on these changes can be found in the file ChangeLogP541.txt inside the PAPI tarball.

Last but not least, a special Thank You goes out to all our collaborators and contributors!

papi-5.4.1.tar.gz   Download View License

Announcing PAPI 5.4.0

Just in time for SuperComputing 2014, PAPI 5.4.0 is now available.

This release provides a new component for the high speed power measurement API for IBM Blue Gene/Q (BG/Q), called EMON, to provide access to power and energy data on BG/Q in a transparent fashion. This additional support complements the earlier BGPM components for BG/Q, and enables PAPI users and tool developers to use their PAPI instrumented code as is without having to learn a new set of library and instrumentation primitives.

We have added initial support for Applied Micro X-Gene architecture, RAPL (energy measurement) support for Intel Haswell models, and support for the IBM POWER8 system when run as a non-virtualized platform 'PowerNV'.  Furthermore, we have extended the RAPL energy measurements via msr-safe, which is a linux kernel module that allows user access to a whitelisted set of MSRs.

This release also includes several enhancements for the perf_event (core/uncore) components, including support for extended event masks which adds a number of new masks that for example enable counting in user domain, kernel domain, or on a specific cpu.

Additionally, there are also changes to the papi_component_avail utility which now provides a list of PMU names supported by active components.The papi_native_avail utility now supports a more robust "--validate" check on systems with events that require multiple masks to be provided in order to be a valid event (e.g., on Intel SandyBridge EP).

There have been several other bug fixes and enhancements:

  • Updated IBM POWER7, POWER8 presets
  • Hardware counter and event count added/fixed for BGPM components
  • Reduced overhead of API call PAPI_name_to_code()
  • Growing list of native events in core/uncore components fixed
  • Cleaned up Intel IvyBridge presets

As always, there are more details on these changes in the file ChangeLogP540.txt inside the PAPI tarball.

papi-5.4.0.tar.gz   Download View License

Source Code Repository


If you would like to interactively browse the PAPI source code, go to the Web based source browser here:

This source browser is also accessible through the Trac bug reporting system or directly through the Browse Source link in the menu to the left.

You can also stay up to date directly by cloning a copy of our git Source Code Repository

Make sure git is installed on your machine. You can download a copy here.

Download the PAPI repository the first time with the following command:

> git clone

This creates a complete copy of the papi git repository on your computer in a folder called 'papi'.

To make sure your copy is up to date with the repository:

> cd papi
> git pull


Copyright © 2016 The University of Tennessee. All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
· Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
· Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer listed in this license in the documentation and/or other materials provided with the distribution.
· Neither the name of the copyright holders nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

This software is provided by the copyright holders and contributors "as is" and any express or implied warranties, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose are disclaimed. in no event shall the copyright owner or contributors be liable for any direct, indirect, incidental, special, exemplary, or consequential damages (including, but not limited to, procurement of substitute goods or services; loss of use, data, or profits; or business interruption) however caused and on any theory of liability, whether in contract, strict liability, or tort (including negligence or otherwise) arising in any way out of the use of this software, even if advised of the possibility of such damage.

May 24 2016 Admin Login