PAPI is a cross-platform interface to the hardware performance counters available on most modern microprocessors. In addition to defining a standard set of routines for configuring and accessing the counters, PAPI defines a common set of performance events considered most useful for application performance tuning. These events include operation and cycle counts, cache and memory access events, and branch behavior events. Most recently, PAPI has been extended to PAPI-C (component PAPI), which provides simultaneous access to multiple counter domains, including the previous on-processor counters as well as off-processor counters and sensors such as network counters and temperature sensors.
Fortran and C calling interfaces
Open source: New BSD
University of Tennessee