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

PAPI_get_virt_usec(3)						       PAPI						     PAPI_get_virt_usec(3)

PAPI_get_virt_usec - get virtual time counter values in microseconds
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); * See Also: PAPIF PAPI PAPI PAPI_get_real_cyc PAPI_get_virt_cyc Author Generated automatically by Doxygen for PAPI from the source code. Version Tue Jun 17 2014 PAPI_get_virt_usec(3)