Questions tagged [likwid]

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.

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.