CentOS 7.0 - man page for papi_get_virt_cyc (centos section 3)

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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\n",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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