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Problem: per the hwloc(7) documentation for hwloc v2.3.0, the HWLOC_COMPONENTS environment variable, if used, will override the HWLOC_XMLFILE variable. According to the docs, "since this variable is the low-level and more generic way to select components, it takes precedence over environment variables for selecting components."
I don't believe we've actually hit this problem. But just in case, it seems advisable to drop the HWLOC_COMPONENTS variable in favor of using the xml file.