1HWLOC-PATCH(1)                       hwloc                      HWLOC-PATCH(1)
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NAME

6       hwloc-patch - Apply a topology difference to an existing XML topology
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SYNOPSIS

9       hwloc-patch [options] [<topology.xml> | refname] [<diff.xml> | -] <out‐
10       put.xml>
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12       hwloc-patch [options] [<topology.xml> | refname] [<diff.xml> | -]
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OPTIONS

15       -R --reverse
16                 Reverse the sense the difference file.
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18       --version Report version and exit.
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20       -h --help Display help message and exit.
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DESCRIPTION

23       hwloc-patch loads the difference between two topologies from a XML file
24       (or  from  the  standard input) and applies it to an existing topology,
25       generating a new, modified one.
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27       The XML difference may have been computed earlier  with  hwloc-diff  or
28       hwloc-compress-dir.
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30       If  <output.xml> is given, the new, modified topology is stored in that
31       new file. Otherwise, <topology.xml> is modified in place.
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33       If refname is given instead of <topology.xml>, the input topology file‐
34       name  is  automatically guessed by reading the refname field of the XML
35       diff file.  By default hwloc-diff generates XML diffs  with  the  right
36       reference topology filename (without any path prefix).
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38       If  -  is  given instead of <diff.xml>, the topology difference is read
39       from the standard input.
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41       NOTE: If some application-specific userdata were been exported  to  the
42       input  XMLs, they will be ignored and discarded from the output because
43       hwloc has no way to understand and patch them.
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45       NOTE: It is highly recommended that you read the hwloc(7) overview page
46       before  reading  this  man  page.   Most  of  the concepts described in
47       hwloc(7) directly apply to the hwloc-patch utility.
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EXAMPLES

50       hwloc-patch's operation is best described through several examples.
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52       Apply a XML topology difference file to an existing topology:
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54           $ hwloc-patch fourmi023.xml diff.xml fourmi023-new.xml
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56       Apply a XML topology difference file whole refname field  contains  the
57       right input topology:
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59           $ hwloc-patch refname diff.xml fourmi023-new.xml
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61       Apply a XML topology from the standard intput:
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63           $ cat diff.xml | hwloc-patch fourmi023.xml - fourmi023-new.xml
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65       Directly  compute the difference between two topologies and apply it to
66       another one, in place:
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68           $   hwloc-diff   fourmi023.xml    fourmi024.xml    |    hwloc-patch
69       fourmi025.xml -
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RETURN VALUE

73       Upon  successful  execution, hwloc-patch outputs the modified topology.
74       The return value is 0.
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76       hwloc-patch also returns nonzero if any kind of error occurs,  such  as
77       (but not limited to) failure to parse the command line.
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SEE ALSO

80       hwloc(7), lstopo(1), hwloc-diff(1), hwloc-compress-dir(1)
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852.4.1                            Feb 11, 2021                   HWLOC-PATCH(1)
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