P_[ACTION]_indv

This pattern accesses the file in a concurrent manner. All participating processes access a common file. See the basic definitions and a schematic view of the pattern below.

P_[ACTION]_indv Definition

Property

Description

Measured pattern

As symbolized in figure I/O benchmarks, aggregation for output

Elementary I/O action

As symbolized in the figure below. In this figure, Nproc is the number of processes.

MPI routines for the blocking mode

MPI_File_write/MPI_File_read

MPI routines for the nonblocking mode

MPI_File_iwrite/MPI_File_iread

etype

MPI_BYTE

File type

Tiled view, disjoint contiguous blocks

MPI data type

MPI_BYTE

Reported timings

t (in μsec) as indicated in the figure I/O benchmarks, aggregation for output, aggregate and non-aggregate for the Write flavor.

Reported throughput

x/t, aggregate and non-aggregate for the Write flavor

P_[ACTION]_indv Pattern

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