[mpich-discuss] COMM_SELF and collective IO

Rajeev Thakur thakur at mcs.anl.gov
Fri Oct 16 18:53:37 CDT 2009

Why don't you just use MPI_File_read instead?


> -----Original Message-----
> From: mpich-discuss-bounces at mcs.anl.gov 
> [mailto:mpich-discuss-bounces at mcs.anl.gov] On Behalf Of burlen
> Sent: Friday, October 16, 2009 5:39 PM
> To: mpich-discuss at mcs.anl.gov
> Subject: [mpich-discuss] COMM_SELF and collective IO
> I have an io code that uses the subarray type. I use the 
> collective IO function, MPI_File_read_all. Now, I have a use 
> case where each process needs to read independently of the 
> others. What I am tempted to do is change the communicator to 
> MPI_COMM_SELF and use the same code. I suspect that this is a 
> bad idea. Is it?
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