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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	topol-
		 ogy  should  be  used when applying the resulting difference.
		 hwloc-patch may use that name to automatically	load the rele-
		 vant reference	topology 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  oth-
       erwise.

       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 std-
       out:

	   $ 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  re-
       turn value is 0.

       If  the	difference  is	too complex to be represented, an error	is re-
       turned 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)

2.11.2				 Sep 26, 2024			 HWLOC-DIFF(1)

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