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|Title||The PAPI Cross-Platform Interface to Hardware Performance Counters|
|Publication Type||Conference Paper|
|Year of Publication||2001|
|Authors||London, K., S. Moore, P. Mucci, K. Seymour, and R. Luczak|
|Conference Name||Department of Defense Users' Group Conference Proceedings|
|Conference Location||Biloxi, Mississippi|
The purpose of the PAPI project is to specify a standard API for accessing hardware performance counters available on most modern microprocessors. These counters exist as a small set of registers that count “events,” which are occurrences of specific signals and states related to the processor’s function. Monitoring these events facilitates correlation between the structure of source/object code and the efficiency of the mapping of that code to the underlying architecture. This correlation has a variety of uses in performance analysis and tuning. The PAPI project has developed a standard set of hardware events and a standard cross-platform library interface to the underlying counter hardware. The PAPI library has been implemented for a number of Shared Resource Center platforms. The PAPI project is developing end-user tools for dynamically selecting and displaying hardware counter performance data. PAPI support is also being incorporated into a number of third-party tools.