No, the file offsets represented by the file view must be "monotonically nondecreasing” (3.1, 492:5-6). You can do the permutation instead in the datatype describing memory buffer in the read call. No restrictions on that datatype. Rajeev
On Oct 1, 2015, at 10:10 AM, Dorier, Matthieu <[email protected]> wrote:
(I meant "ACBD" in the first case, not "ACDB")
From: Dorier, Matthieu [[email protected]] Sent: Thursday, October 01, 2015 10:03 AM To: [email protected] Subject: [mpich-discuss] Question on MPI_Type_create_struct
Hi,
Suppose I have a file containing "ABCD", I build a type that would let me read "AC" and another type allowing me to read "BD". Can I then create a struct type using MPI_Type_create_struct combining the 2 types, and use it in an MPI_File_set_view such that if I then read 4 bytes on the file, I get "ACDB" in my buffer?
If so, another more complicated scenario: say my first type would let me read "ACD" from the file and the second type would allow me to read "BC", can I then build a struct type using those two types, use it in an MPI_File_set_view to get "ACDBC" if I read 5 bytes?
Thanks,
Matthieu _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss
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