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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 topol- ogy XML. By default, <input1.xml> is used without its full path. --version Report version and exit. -h --help Display help message 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 be- fore reading this man page. Most of the concepts described in hwloc(7) di- rectly 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 an- other 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) 2.12.1 May 12, 2025 HWLOC-DIFF(1)
NAME | SYNOPSIS | OPTIONS | DESCRIPTION | EXAMPLES | RETURN VALUE | SEE ALSO
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