S_[ACTION]_indv

File I/O performed by a single process. This pattern mimics the typical case when a particular master process performs all of the I/O. See the basic definitions and a schematic view of the pattern below.

S_[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.

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

MPI_BYTE

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

S_[ACTION]_indv Pattern