---
name: "adios2_iotest.mpi"
section: "1"
platform: "linux"
package: "adios2-mpi-bin"
version: "2.10.2+dfsg1-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/adios2_iotest.mpi"
---

# adios2\_iotest.mpi(1)

ADIOS2 utility

## NAME

adios2\_iotest.mpi - ADIOS2 utility

## SYNOPSIS

**adios\_iotest** *-a appid -c config {-s \| -w} {-d d1*\[*,d2,*..*,dN*\] *\| -D r1*\[*,r2,*..*,rN*\]*}*\[*-x file*\]

## DESCRIPTION

- **-a** appID:

  unique number for each application in the workflow

**-c** config: data specification config file

- **-d** ...

  define process decomposition:

- d1:

  number of processes in 1st (slowest) dimension

- dN:

  number of processes in Nth dimension d1\*d2\*..\*dN must equal the number of processes

- **-D** ...

  define process decomposition ratio:

- r1:

  ratio of process decomposition in the 1st (slowest) dimension

- rN:

  ratio of process decomposition in the Nth dimension r1xr2x..xrN must scale up to process countcount without remainder

- **-s** OR **-w**:

  strong or weak scaling. Dimensions in config are treated accordingly

- **-x** file

  ADIOS configuration XML file

- **--hdf5**

  Use native Parallel HDF5 instead of ADIOS for I/O

- **-v**

  increase verbosity

- **-h**

  display this help

- **-F**

  turn on fixed I/O pattern explicitly

- **-T**

  turn on multi-threaded MPI (needed by SST/MPI)

- **-p**

  specify the path of the output explicitly

- **-t**

  print and dump the timing measured by the I/O timer