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NEWS (last update 4.11.2014):

There is a new bug fix release 3.1.3 available now.

Changelog:

  • Full Uncore Support for Nehalem EX and Westmere EX
  • Atom Silvermont (Avoton + BayTrail) support
  • Read Marker API results and derived metrics in instrumented application (Patch by Julian Kunkel)
  • More low-level benchmarks for likwid-bench
  • Kernel module for enabling the RDPMC instruction
  • Use RDPMC for fixed and general purpose core-local counters if possible
  • New undocumented but working events
  • Support for all RAPL domains in likwid-powermeter
  • Better PCI device lookup
  • Lots of bug fixes

The release is available here. This link is also available in the sidebar under Downloads.

I will regularly blog posts about my likwid development and issues around performance related questions. You can find the blog here:

http://likwid-tools.blogspot.com/


Likwid stands for Like I knew what I am doing. This project contributes easy to use command line tools for Linux to support programmers in developing high performance multi threaded programs.

It contains the following tools:

  • likwid-topology: Show the thread and cache topology
  • likwid-perfctr: Measure hardware performance counters on Intel and AMD processors
  • likwid-features: Show and Toggle hardware prefetch control bits on Intel Core 2 processors
  • likwid-pin: Pin your threaded application without touching your code (supports pthreads, Intel OpenMP and gcc OpenMP)
  • likwid-bench: Benchmarking framework allowing rapid prototyping of threaded assembly kernels
  • likwid-mpirun: Script enabling simple and flexible pinning of MPI and MPI/threaded hybrid applications
  • likwid-perfscope: Frontend for likwid-perfctr timeline mode. Allows live plotting of performance metrics.
  • likwid-powermeter: Tool for accessing RAPL counters and query Turbo mode steps on Intel processor.
  • likwid-memsweeper: Tool to cleanup ccNUMA memory domains and force eviction of dirty cachelines from caches.
  • likwid-setFrequencies: Tool to set specific processor frequencies.

Likwid stands out because:

  • No kernel patching, any vanilla linux 2.6 or newer kernel works
  • Transparent, always clear which events are chosen, event tags have the same naming as in documentation
  • Lightweight, LIKWID tries to add no overhead and keeps out of your way.
  • Easy to use, simple to build, no need to touch your code, configurable from outside. Clear CLI interface.
  • Multiplatform, likwid supports Intel and AMD processors
  • Up to date, likwid tries to fully support new processors as soon as possible
  • Extensible, you can add functionality by means of simple text files

If you encounter problems feel free to ask questions in the User Mailing List.

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