PAPI_get_virt_cyc(3) PAPI PAPI_get_virt_cyc(3)NAME
PAPI_get_virt_cyc -
get virtual time counter value in clock cycles
SYNOPSIS Detailed Description
@retval PAPI_ECNFLCT
If there is no master event set.
This will happen if the library has not been initialized, or
for threaded applications, if there has been no thread id
function defined by the PAPI_thread_init function.
@retval PAPI_ENOMEM
For threaded applications, if there has not yet been any thread
specific master event created for the current thread, and if
the allocation of such an event set fails, the call will return
PAPI_ENOMEM or PAPI_ESYS .
This function returns the total number of virtual units from some
arbitrary starting point.
Virtual units accrue every time the process is running in user-mode on
behalf of the process.
Like the real time counters, this count is guaranteed to exist on every platform
PAPI supports.
However on some platforms, the resolution can be as bad as 1/Hz as defined
by the operating system.
@par Examples:
s = PAPI_get_virt_cyc();
your_slow_code();
e = PAPI_get_virt_cyc();
printf("Process has run for cycles: %lld
",e-s);
*
Author
Generated automatically by Doxygen for PAPI from the source code.
Version 5.2.0.0 Tue Jun 17 2014 PAPI_get_virt_cyc(3)
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PAPI_attach(3) PAPI PAPI_attach(3)NAME
PAPI_attach -
Attach PAPI event set to the specified thread id.
SYNOPSIS Detailed Description
@par C Interface:
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 specifed thread;
PAPI_detach breaks that connection and restores the EventSet to the
original executing thread.
@param EventSet
An integer handle for a PAPI EventSet as created by PAPI_create_eventset.
@param tid
A thread id as obtained from, for example, PAPI_list_threads or PAPI_thread_id.
@retval PAPI_ECMP
This feature is unsupported on this component.
@retval PAPI_EINVAL
One or more of the arguments is invalid.
@retval PAPI_ENOEVST
The event set specified does not exist.
@retval PAPI_EISRUN
The event set is currently counting events.
@par 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
Generated automatically by Doxygen for PAPI from the source code.
Version 5.2.0.0 Tue Jun 17 2014 PAPI_attach(3)
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