CentOS 7.0 - man page for papi_get_virt_usec (centos section 3)
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PAPI_get_virt_usec(3) PAPI PAPI_get_virt_usec(3)
get virtual time counter values in microseconds
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
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.
s = PAPI_get_virt_cyc();
e = PAPI_get_virt_cyc();
printf("Process has run for cycles: %lld\n",e-s);
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Version 188.8.131.52 Tue Jun 17 2014 PAPI_get_virt_usec(3)
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