PAPI_attach

NAME

PAPI_attach -

Attach PAPI event set to the specified thread id.

SYNOPSIS

Detailed Description

C Interface:

#include <papi.h>
int PAPI_attach( int EventSet, unsigned long tid );

PAPI_attach is a wrapper function that calls PAPI_set_opt to allow PAPI to monitor performance counts on a thread other than the one currently executing. This is sometimes referred to as third party monitoring. PAPI_attach connects the specified EventSet to the specified thread; PAPI_detach breaks that connection and restores the EventSet to the original executing thread.

Parameters:

EventSet An integer handle for a PAPI EventSet as created by PAPI_create_eventset.
tid A thread id as obtained from, for example, PAPI_list_threads or PAPI_thread_id.

Return values:

PAPI_ECMP This feature is unsupported on this component.
PAPI_EINVAL One or more of the arguments is invalid.
PAPI_ENOEVST The event set specified does not exist.
PAPI_EISRUN The event set is currently counting events.

Examples:

int EventSet = PAPI_NULL;
unsigned long pid;
pid = fork( );
if ( pid <= 0 )
exit( 1 );
if ( PAPI_create_eventset( &EventSet ) != PAPI_OK )
exit( 1 );
// Add Total Instructions Executed to our EventSet
if ( PAPI_add_event( EventSet, PAPI_TOT_INS ) != PAPI_OK )
exit( 1 );
// Attach this EventSet to the forked process
if ( PAPI_attach( EventSet, pid ) != PAPI_OK )
exit( 1 );

See Also:

PAPI_set_opt

PAPI_list_threads

PAPI_thread_id

PAPI_thread_init

Author

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