Abstract
Exploiting the performance of today’s microprocessors requires intimate knowledge of the microarchitecture as well as an awareness of the ever-growing complexity in thread and cache topology. LIKWID is a set of command line utilities that addresses four key problems: Probing the thread and cache topology of a shared-memory node, enforcing thread-core affinity on a program, measuring performance counter metrics, and microbenchmarking for reliable upper performance bounds. Moreover, it includes an mpirun wrapper allowing for portable thread-core affinity in MPI and hybrid MPI/threaded applications. To demonstrate the capabilities of the tool set we show the influence of thread affinity on performance using the well-known OpenMP STREAM triad benchmark, use hardware counter tools to study the performance of a stencil code, and finally show how to detect bandwidth problems on ccNUMA-based compute nodes.
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References
Homepage of LIKWID tool suite http://code.google.com/p/likwid/
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Acknowledgment
We are indebted to Intel Germany for providing test systems and early access hardware for benchmarking. A special acknowledgment goes to Michael Meier, who had the basic idea for likwid-pin , implemented the prototype, and provided many useful thoughts in discussions. This work was supported by the Competence Network for Scientific and Technical High Performance Computing in Bavaria (KONWIHR) under the project “OMI4papps.”
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© 2011 Springer-Verlag Berlin Heidelberg
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Treibig, J., Hager, G., Wellein, G. (2011). LIKWID: Lightweight Performance Tools. In: Bischof, C., Hegering, HG., Nagel, W., Wittum, G. (eds) Competence in High Performance Computing 2010. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-24025-6_14
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DOI: https://doi.org/10.1007/978-3-642-24025-6_14
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