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PAPI_num_counters(3) PAPI PAPI_num_counters(3)

NAME

PAPI_num_counters -
Get the number of hardware counters available on the system.

SYNOPSIS

Detailed Description

@par C Interface:


int PAPI_num_counters( void );
Postcondition:
Initializes the library to PAPI_HIGH_LEVEL_INITED if necessary.
Return values:
PAPI_EINVAL papi.h is different from the version used to compile the PAPI library.
 
PAPI_ENOMEM Insufficient memory to complete the operation.
 
PAPI_ESYS A system or C library call failed inside PAPI, see the errno variable.
Examples: 
* 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.0);
*
PAPI_num_counters() 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.
Note:
This function only works for the CPU component. To determine the number of counters on another component, use the low level PAPI_num_cmp_hwctrs().

Author

Generated automatically by Doxygen for PAPI from the source code.
Thu Nov 17 2016 Version 5.5.1.0