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HWLOC-DIFF(1)                        hwloc                       HWLOC-DIFF(1)


NAME

       hwloc-diff - Compute differences between two XML topologies


SYNOPSIS

       hwloc-diff [options] <input1.xml> <input2.xml>

       hwloc-diff [options] <input1.xml> <input2.xml> <output.xml>


OPTIONS

       --refname <name>
                 Use <name> as the identifier for the reference topology in
                 the output XML difference.  It is meant to tell which
                 topology should be used when applying the resulting
                 difference.  hwloc-patch may use that name to automatically
                 load the relevant reference topology XML.  By default,
                 <input1.xml> is used without its full path.

       --version Report version and exit.


DESCRIPTION

       hwloc-diff computes the difference between two XML topologies and
       stores the result into <output.xml> if any, or dumps it to stdout
       otherwise.

       The output difference may later be applied to another topology with
       hwloc-patch.

       hwloc-compress-dir may be used for computing the diffs between all XML
       files in a directory.

       NOTE: It is highly recommended that you read the hwloc(7) overview page
       before reading this man page.  Most of the concepts described in
       hwloc(7) directly apply to the hwloc-diff utility.


EXAMPLES

       hwloc-diff's operation is best described through several examples.

       Compute the difference between two XML topologies and output it to
       stdout:

           $ hwloc-diff fourmi023.xml fourmi024.xml
           Found 11 differences, exporting to stdout
           <?xml version="1.0" encoding="UTF-8"?>
           ...

       Output the difference to file diff.xml instead:

           $ hwloc-diff fourmi023.xml fourmi024.xml diff.xml
           Found 11 differences, exporting to diff.xml

       When the difference is too complex to be represented:

           $ hwloc-diff fourmi023.xml avakas-frontend1.xml
           Found 1 differences, including 1 too complex ones.
           Cannot export differences to stdout

       Directly compute the difference between two topologies and apply it to
       another one:

           $ hwloc-diff fourmi023.xml fourmi024.xml | hwloc-patch
       fourmi025.xml -


RETURN VALUE

       Upon successful execution, hwloc-diff outputs the difference.  The
       return value is 0.

       If the difference is too complex to be represented, an error is
       returned and the output is not generated.

       hwloc-diff also returns nonzero if any kind of error occurs, such as
       (but not limited to) failure to parse the command line.


SEE ALSO

       hwloc(7), lstopo(1), hwloc-patch(1), hwloc-compress-dir(1)

1.11.1                         October 15, 2015                  HWLOC-DIFF(1)

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