You're right, thanks a lot Edgar!
Quoting Edgar Gabriel (2016-04-07 23:18:46)
> I found the bug in your code. The displacement of the file view has to
> be given in absolute bytes, not in multiples of etypes.
> ---snip---
> The disp displacement argument specifies the position (absolute offset
On Thu, Apr 7, 2016 at 9:28 AM, Dave Love wrote:
> ...
> Anyhow, the lesson seems to be that you shouldn't use mpi_wtime if you
> need decent precision or realistic mpi_wtick across implementations.
>
> I certainly hope that this isn't the lesson anyone learns from this. It
is extremely importan
What version of Open MPI did you execute your test with?
mpirun (Open MPI) 1.8.6
What version of Open MPI did you execute your test with?
Edgar
On 4/7/2016 1:54 PM, david.froger...@mailoo.org wrote:
Hello,
Here is a simple `C` program reading a file in parallel with `MPI IO`:
#include
#include
#include "mpi.h"
#define N 10
main( int argc,
Hello,
Here is a simple `C` program reading a file in parallel with `MPI IO`:
#include
#include
#include "mpi.h"
#define N 10
main( int argc, char **argv )
{
int rank, size;
MPI_Init(&argc, &argv);
MPI_Comm_rank( MPI_COMM_WORLD, &rank );
Gilles Gouaillardet writes:
> clock_gettime() has a higher precision than gettimeofday(), though it
> likely has
> a lower precision and higher overhead than opal_sys_timer_get_cycles()
Do you mean OMPI actually uses cycles for timing somewhere? The
precision of that would be irrelevant, when i
