A lightweight tool collection for multi threaded high performance programming
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)
There are already a bunch of performance counter tools available. Likwid stands out because:
* No kernel patching, any vanilla kernel with the standard msr module works
* Transparent, always clear which events are chosen, event tags have the same naming as in documentation
* Lightweight, LIKWID on purpose does not use sampling and adds no overhead during measurement.
* Easy to use, no java hog, 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
If you encounter problems feel free to ask questions in the User Mailing List.
NOTICE: Although Likwid is already fully usable Likwid is not yet released. I need your help to find bugs and improve Likwid to ensure a high quality for the release. Give it a try and test it. If you encounter problems write a email to me or the Forum. I promise a quick reaction time to fix errors or respond to feature requests.
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What's New in This Release:
- Support for Intel SandyBridge Uncore (partial) and Intel IvyBridge (only core part).
- A new application likwid-memsweeper to cleanup ccNUMA memory domains.
- Initial support for Intel Xeon Phi (KNC).
- Better support for AMD Interlagos.