PAPI_set_multiplex - Man Page

C Interface:

Parameters

EventSet an integer handle for a PAPI event set as created by PAPI_create_eventset

Return values

PAPI_OK
PAPI_EINVAL -- One or more of the arguments is invalid, or the EventSet is already multiplexed.
PAPI_ENOCMP -- The EventSet specified is not yet bound to a component.
PAPI_ENOEVST -- The EventSet specified does not exist.
PAPI_EISRUN -- The EventSet is currently counting events.
PAPI_ENOMEM -- Insufficient memory to complete the operation.

PAPI_set_multiplex converts a standard PAPI event set created by a call to PAPI_create_eventset into an event set capable of handling multiplexed events. This must be done after calling PAPI_multiplex_init, and either PAPI_add_event or PAPI_assign_eventset_component, but prior to calling PAPI_start().

Events can be added to an event set either before or after converting it into a multiplexed set, but the conversion must be done prior to using it as a multiplexed set.

Note

Multiplexing can't be enabled until PAPI knows which component is targeted. Due to the late binding nature of PAPI event sets, this only happens after adding an event to an event set or explicitly binding the component with a call to PAPI_assign_eventset_component.

Example:

int EventSet = PAPI_NULL;
int ret;
 
// Create an empty EventSet
ret = PAPI_create_eventset(&EventSet);
if (ret != PAPI_OK) handle_error(ret);

// Bind it to the CPU component
ret = PAPI_assign_eventset_component(EventSet, 0);
if (ret != PAPI_OK) handle_error(ret);

// Check  current multiplex status
ret = PAPI_get_multiplex(EventSet);
if (ret == TRUE) printf("This event set is ready for multiplexing\n.")
if (ret == FALSE) printf("This event set is not enabled for multiplexing\n.")
if (ret < 0) handle_error(ret);

// Turn on multiplexing
ret = PAPI_set_multiplex(EventSet);
if ((ret == PAPI_EINVAL) && (PAPI_get_multiplex(EventSet) == TRUE))
  printf("This event set already has multiplexing enabled\n");
else if (ret != PAPI_OK) handle_error(ret);

See also

PAPI_multiplex_init

PAPI_get_multiplex

PAPI_set_opt

PAPI_create_eventset

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