[MPICH] Question about independent IO

[Robert Latham]

On Thu, Dec 06, 2007 at 06:22:06PM -0500, Christina Patrick wrote:

> I wanted to know if that is the case. I wrote a program that uses
> MPI_File_set_view() along with MPI_File_write_at(). Does this program
> use any kind of optimization?

Yes, it's entirely possible that your program is using the data
sieving optimization.  ROMIO will try to determine if the file view is
contiguous or non-contiguous.  Only in the non-contiguous case will it
use data sieving.  

==rob

-- 
Rob Latham
Mathematics and Computer Science Division    A215 0178 EA2D B059 8CDF
Argonne National Lab, IL USA                 B29D F333 664A 4280 315B