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Parallel MPI application to synchronize two files or two directory trees.

dsync makes DEST match SRC, adding missing entries from DEST, and updating existing entries in DEST as necessary so that SRC and DEST have identical content, ownership, timestamps, and permissions.



Show differences without changing anything.

-b, --batch-files N

Batch files into groups of up to size N during copy operation.

-c, --contents

Compare files byte-by-byte rather than checking size and mtime to determine whether file contents are different.

-D, --delete

Delete extraneous files from destination.

Create hardlink in DEST to files in DIR when file is unchanged rather than create a new file. One can use this option to conserve storage space during an incremental backup.

For example in the following, any file that would be copied from /src to / that is the same as the file already existing in /src.bak will instead be hardlinked to the file in /src.bak:

# initial backup of /src dsync /src /src.bak

# incremental backup of /src dsync --link-dest /src.bak /src /

-S, --sparse

Create sparse files when possible.

--progress N

Print progress message to stdout approximately every N seconds. The number of seconds must be a non-negative integer. A value of 0 disables progress messages.

-v, --verbose

Run in verbose mode. Prints a list of statistics/timing data for the command. Files walked, started, completed, seconds, files, bytes read, byte rate, and file rate.

-q, --quiet

Run tool silently. No output is printed.

-h, --help

Print the command usage, and the list of options available.


  1. Synchronize dir2 to match dir1:

mpirun -np 128 dsync /path/to/dir1 /path/to/dir2


The mpiFileUtils source code and all documentation may be downloaded from <>