.TH "PAPI_num_counters" 3 "Fri Feb 22 2019" "Version 5.7.0.0" "PAPI" \" -*- nroff -*-
.ad l
.nh
.SH NAME
PAPI_num_counters \- 
.PP
Get the number of hardware counters available on the system\&.  

.SH SYNOPSIS
.br
.PP
.SH "Detailed Description"
.PP 

.PP
.nf
@par C Interface:
\#include <papi.h> @n
int PAPI_num_counters( void );

.fi
.PP
.PP
\fBPostcondition:\fP
.RS 4
Initializes the library to PAPI_HIGH_LEVEL_INITED if necessary\&.
.RE
.PP
\fBReturn values:\fP
.RS 4
\fIPAPI_EINVAL\fP \fBpapi\&.h\fP is different from the version used to compile the PAPI library\&. 
.br
\fIPAPI_ENOMEM\fP Insufficient memory to complete the operation\&. 
.br
\fIPAPI_ESYS\fP A system or C library call failed inside PAPI, see the errno variable\&.
.RE
.PP
\fBExamples:\fP
.RS 4

.PP
.nf
* int num_hwcntrs;
* //  The installation does not support PAPI 
* if ((num_hwcntrs = PAPI_num_counters()) < 0 )
*   handle_error(1);
* //  The installation supports PAPI, but has no counters 
* if ((num_hwcntrs = PAPI_num_counters()) == 0 )
*   fprintf(stderr,"Info:: This machine does not provide hardware counters\&.\n");
*   

.fi
.PP
.RE
.PP
\fBPAPI_num_counters()\fP returns the optimal length of the values array for the high level functions\&. This value corresponds to the number of hardware counters supported by the current CPU component\&.
.PP
\fBNote:\fP
.RS 4
This function only works for the CPU component\&. To determine the number of counters on another component, use the low level \fBPAPI_num_cmp_hwctrs()\fP\&. 
.RE
.PP


.SH "Author"
.PP 
Generated automatically by Doxygen for PAPI from the source code\&.