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papi_num_counters(3) [centos man page]

PAPI_num_counters(3)						       PAPI						      PAPI_num_counters(3)

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. Version Tue Jun 17 2014 PAPI_num_counters(3)

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PAPI_read_counters(3)						       PAPI						     PAPI_read_counters(3)

PAPI_read_counters - Read and reset counters. SYNOPSIS
Detailed Description @par C Interface: int PAPI_read_counters( long long *values, int array_len ); Parameters: *values an array to hold the counter values of the counting events arry_len the number of items in the *events array Precondition: These calls assume an initialized PAPI library and a properly added event set. Postcondition: The counters are reset and left running after the call. Return values: PAPI_EINVAL One or more of the arguments is invalid. PAPI_ESYS A system or C library call failed inside PAPI, see the errno variable. PAPI_read_counters() copies the event counters into the array *values. do_100events(); if ( PAPI_read_counters( values, num_hwcntrs ) != PAPI_OK ) handlw_error(1); // values[0] now equals 100 do_100events(); if ( PAPI_accum_counters( values, num_hwcntrs ) != PAPI_OK ) handle_error(1); // values[0] now equals 200 values[0] = -100; do_100events(); if ( PAPI_accum_counters(values, num_hwcntrs ) != PAPI_OK ) handle_error(); // values[0] now equals 0 * See Also: PAPI_set_opt() PAPI_start_counters() Fortran Interface: #include 'fpapi.h' PAPIF_read_counters( C_LONG_LONG(*) values, C_INT array_len, C_INT check ) See Also: PAPI_read_counters Author Generated automatically by Doxygen for PAPI from the source code. Version Tue Jun 17 2014 PAPI_read_counters(3)
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