NEWS (last update 15.6.2015):

Due to the end of the Google Code service we moved LIKWID to github. You can find us here:

https://github.com/rrze-likwid/likwid

This site will not be maintained anymore. The mailing lists will stay at Google groups for now.

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.