[MPICH] question about MPI-IO Read_all

[Russell L. Carter]

Ok, very good Wei-keng, one more question.  This is exactly
what I wanted to know, thanks for addressing it.

Wei-keng Liao wrote:

[...]
> The data amount to be read/written by an MPI process in a 
> Read_all()/Write_all() is the "count" multiplies the size of the buffer 
> datatype. Therefore, the read/write amount can still be larger than 2GB 
> when integer "count" is less than 2^32. Note that the data amount one 
> can read/write is determined by these two arguments, not the fileview.
> Hope this helps.

So if I use say an hindexed datatype for the Read_all, is the count just
'1'?

Thanks,
Russell

> Wei-keng
> 
> 
>