int PAPI_get_opt( int option, PAPI_option_t * ptr );
option Defines the option to get. Possible values are briefly described in the table below.
ptr Pointer to a structure determined by the selected option. See PAPI_option_t for a description of possible structures.
PAPI_EINVAL The specified option or parameter is invalid.
PAPI_ENOEVST The EventSet specified does not exist.
PAPI_ECMP The option is not implemented for the current component.
PAPI_ENOINIT PAPI has not been initialized.
PAPI_get_opt() queries the options of the PAPI library or a specific event set created by PAPI_create_eventset. Some options may require that the eventset be bound to a component before they can execute successfully. This can be done either by adding an event or by explicitly calling PAPI_assign_eventset_component.
Ptr is a pointer to the PAPI_option_t structure, which is actually a union of different structures for different options. Not all options require or return information in these structures. Each returns different values in the structure. Some options require a component index to be provided. These options are handled explicitly by the PAPI_get_cmp_opt() call.
- Some options, such as PAPI_DOMAIN and PAPI_MULTIPLEX are also available as separate entry points in both C and Fortran.
The reader is encouraged to peruse the ctests code in the PAPI distribution for examples of usage of PAPI_set_opt.
Possible values for the PAPI_get_opt option parameter
OPTION DEFINITION PAPI_DEFDOM Get default counting domain for newly created event sets. Requires a component index. PAPI_DEFGRN Get default counting granularity. Requires a component index. PAPI_DEBUG Get the PAPI debug state and the debug handler. The debug state is specified in ptr->debug.level. The debug handler is specified in ptr->debug.handler.
For further information regarding debug states and the behavior of the handler, see PAPI_set_debug. PAPI_MULTIPLEX Get current multiplexing state for specified EventSet. PAPI_DEF_ITIMER Get the type of itimer used in software multiplexing, overflowing and profiling. PAPI_DEF_MPX_NS Get the sampling time slice in nanoseconds for multiplexing and overflow. PAPI_DEF_ITIMER_NS See PAPI_DEF_MPX_NS. PAPI_ATTACH Get thread or process id to which event set is attached. Returns TRUE if currently attached. PAPI_CPU_ATTACH Get ptr->cpu.cpu_num and Attach state for EventSet specified in ptr->cpu.eventset. PAPI_DETACH Get thread or process id to which event set is attached. Returns TRUE if currently attached. PAPI_DOMAIN Get domain for EventSet specified in ptr->domain.eventset. Will error if eventset is not bound to a component. PAPI_GRANUL Get granularity for EventSet specified in ptr->granularity.eventset. Will error if eventset is not bound to a component. PAPI_INHERIT Get current inheritance state for specified EventSet. PAPI_PRELOAD Get LD_PRELOAD environment equivalent. PAPI_CLOCKRATE Get clockrate in MHz. PAPI_MAX_CPUS Get number of CPUs. PAPI_EXEINFO Get Executable addresses for text/data/bss. PAPI_HWINFO Get information about the hardware. PAPI_LIB_VERSION Get the full PAPI version of the library. PAPI_MAX_HWCTRS Get number of counters. Requires a component index. PAPI_MAX_MPX_CTRS Get maximum number of multiplexing counters. Requires a component index. PAPI_SHLIBINFO Get shared library information used by the program. PAPI_COMPONENTINFO Get the PAPI features the specified component supports. Requires a component index.
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