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| Content Provider | ACM Digital Library |
|---|---|
| Author | Wellein, Gerhard Treibig, Jan Meier, Michael Hager, Georg |
| 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. LIKWID stands out because it is easy to install and use and works with any Linux 2.6 kernel. LIKWID has low overhead and is designed to be easily extended by the user. Our poster briefly introduces all LIKWID tools. The different usage modes of likwid-perfctr are demonstrated on several examples: Detection of NUMA problems, use of the likwid marker API and noninvasive measurements with the so called stehoscope and timeline mode. A ccNUMA bandwidth map for a four socket AMD Magny Cours node shows one possible application of likwid-bench. |
| Starting Page | 29 |
| Ending Page | 30 |
| Page Count | 2 |
| File Format | |
| ISBN | 9781450310307 |
| DOI | 10.1145/2148600.2148616 |
| Language | English |
| Publisher | Association for Computing Machinery (ACM) |
| Publisher Date | 2011-11-12 |
| Publisher Place | New York |
| Access Restriction | Subscribed |
| Subject Keyword | Profiling Affinity Performance Hardware performance counters Tool |
| Content Type | Text |
| Resource Type | Article |
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