help5507

It's UWAweek 47

help5507

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UWA week 40 (2nd semester, week 10) ↓

Difference between sequential I/O, indenpendent I/O and collective I/O (both)

7:04pm Thu 3rd Oct, Zhipeng W.

Hi, just a bit confused about some concepts.

Can anyone help explain the difference, thank you.

UWA week 41 (2nd semester, week 11) ↓

Difference between sequential I/O, indenpendent I/O and collective I/O (both)

2:08pm Sun 13th Oct, Marcell S.

Sequential I/O: Only one process performs I/O. Think regular fwrite from stdio.h.

Independent I/O: Parallel I/O, where each process performs its own I/O, without coordination with the other processes. Think MPI_File_write_at.

Collective I/O: Parallel I/O, where all processes (in a communicator) perform I/O together. MPI coordinates and optimises the operations. For example, MPI_File_write_all.

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