bionic (1) hwloc-diff.1.gz

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:  If  some  application-specific userdata were been exported to the input XMLs, they will be ignored
       and discarded from the output because hwloc has no way to understand and compare them.

       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)