PAPI 7.1.0.0
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Simplified call to get instructions per cycle, real and processor time. More...
*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.