int PAPI_ipc( float *rtime, float *ptime, long long *ins, float *ipc );
*rtime realtime since the latest call
*ptime process time since the latest call
*ins instructions since the latest call
*ipc incremental instructions per cycle since the latest call
PAPI_EINVAL The counters were already started by something other than PAPI_ipc().
PAPI_ENOEVNT The events PAPI_TOT_INS and PAPI_TOT_CYC are not supported.
PAPI_ENOMEM Insufficient memory to complete the operation.
The first call to PAPI_ipc() will initialize the PAPI interface, set up the counters to monitor PAPI_TOT_INS and PAPI_TOT_CYC events and start the counters.
Subsequent calls will read the counters and return real time, process time, instructions and the IPC rate since the latest call to PAPI_ipc().
PAPI_ipc() should return a ratio greater than 1.0, indicating instruction level parallelism within the chip. The larger this ratio the more effeciently the program is running. Note that PAPI_ipc() is thread-safe and can therefore be called by multiple threads.
- See also
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