petsc-3.5.1 2014-08-06
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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;

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

Notes

One should use PetscTime() or the -log_summary 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
Index of all Sys routines
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Index of all manual pages