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>
- --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.
- 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.
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)
|February 11, 2021||2.4.1|