PetscGetCPUTime#

Returns the CPU time in seconds used by the process.

Synopsis#

#include "petscsys.h" 
#include "petsctime.h" 
PetscErrorCode PetscGetCPUTime(PetscLogDouble *t)

Not Collective

Output Parameter#

t - Time in seconds charged to the process.

Example#

    #include <petscsys.h>
    ...
    PetscLogDouble t1, t2;

    PetscCall(PetscGetCPUTime(&t1));
    ... code to time ...
    PetscCall(PetscGetCPUTime(&t2));
    printf("Code took %f CPU seconds\n", t2-t1);

Note#

One should use the -log_view option of PETSc for profiling. The CPU time is NOT a realistic number to use since it does not include the time for message passing etc. Also on many systems the accuracy is only on the order of microseconds.

Level#

intermediate

Location#

src/sys/time/cputime.c

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