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63 lines
1.7 KiB
Plaintext
63 lines
1.7 KiB
Plaintext
.TH "PAPI_ipc" 3 "Wed Jun 25 2025 19:30:48" "Version 7.2.0.0" "PAPI" \" -*- nroff -*-
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.ad l
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.nh
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.SH NAME
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PAPI_ipc \- Simplified call to get instructions per cycle, real and processor time\&.
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.SH SYNOPSIS
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.br
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.PP
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.SH "Detailed Description"
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.PP
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.PP
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\fBC Interface: \fP
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.RS 4
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#include <\fBpapi\&.h\fP>
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.br
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int PAPI_ipc( float *rtime, float *ptime, long long *ins, float *ipc );
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.RE
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.PP
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\fBParameters\fP
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.RS 4
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\fI*rtime\fP realtime since the latest call
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.br
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\fI*ptime\fP process time since the latest call
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.br
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\fI*ins\fP instructions since the latest call
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.br
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\fI*ipc\fP incremental instructions per cycle since the latest call
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.RE
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.PP
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\fBReturn values\fP
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.RS 4
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\fIPAPI_EINVAL\fP The counters were already started by something other than PAPI_ipc()\&.
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.br
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\fIPAPI_ENOEVNT\fP The events PAPI_TOT_INS and PAPI_TOT_CYC are not supported\&.
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.br
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\fIPAPI_ENOMEM\fP Insufficient memory to complete the operation\&.
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.RE
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.PP
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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\&.
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.PP
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Subsequent calls will read the counters and return real time, process time, instructions and the IPC rate since the latest call to PAPI_ipc()\&.
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.PP
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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\&.
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.PP
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\fBSee also\fP
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.RS 4
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PAPI_flips_rate()
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.PP
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PAPI_flops_rate()
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.PP
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PAPI_epc()
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.PP
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PAPI_rate_stop()
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.RE
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.PP
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.SH "Author"
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.PP
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Generated automatically by Doxygen for PAPI from the source code\&.
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