1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
|
.TH "PAPI_ipc" 3 "Wed Jun 25 2025 19:30:48" "Version 7.2.0.0" "PAPI" \" -*- nroff -*-
.ad l
.nh
.SH NAME
PAPI_ipc \- Simplified call to get instructions per cycle, real and processor time\&.
.SH SYNOPSIS
.br
.PP
.SH "Detailed Description"
.PP
.PP
\fBC Interface: \fP
.RS 4
#include <\fBpapi\&.h\fP>
.br
int PAPI_ipc( float *rtime, float *ptime, long long *ins, float *ipc );
.RE
.PP
\fBParameters\fP
.RS 4
\fI*rtime\fP realtime since the latest call
.br
\fI*ptime\fP process time since the latest call
.br
\fI*ins\fP instructions since the latest call
.br
\fI*ipc\fP incremental instructions per cycle since the latest call
.RE
.PP
\fBReturn values\fP
.RS 4
\fIPAPI_EINVAL\fP The counters were already started by something other than PAPI_ipc()\&.
.br
\fIPAPI_ENOEVNT\fP The events PAPI_TOT_INS and PAPI_TOT_CYC are not supported\&.
.br
\fIPAPI_ENOMEM\fP Insufficient memory to complete the operation\&.
.RE
.PP
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\&.
.PP
Subsequent calls will read the counters and return real time, process time, instructions and the IPC rate since the latest call to PAPI_ipc()\&.
.PP
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\&.
.PP
\fBSee also\fP
.RS 4
PAPI_flips_rate()
.PP
PAPI_flops_rate()
.PP
PAPI_epc()
.PP
PAPI_rate_stop()
.RE
.PP
.SH "Author"
.PP
Generated automatically by Doxygen for PAPI from the source code\&.
|
