[mpich-discuss] measuring time in mpi program

[Pavan Balaji]

On 02/25/2011 04:24 PM, Jain, Rohit wrote:
> We have lot of 'wait-send' and 'wait-receive' code at lot of places, and
> we need to measure time spent in this sections. We currently use
> gettimeofday() function to measure this time. Would MPI_WTime be faster
> than that?

MPI_Wtime will internally use an appropriate timer -- gettimeofday or a 
more accurate timer if available. You can look through the users' guide 
for more information for appropriate configure options to pick a more 
accurate timer.

  -- Pavan

-- 
Pavan Balaji
http://www.mcs.anl.gov/~balaji