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

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