Comment # 3 on bug 1097006 from Richard Biener

DWZ is limited by some params but indeed it is single-threaded.  I'm not sure
how much of it could be done in parallel (I suspect nothing without a
significant rewrite).  Do we really care so much about the build time?  I ask
because
debuginfo extraction (esp. debugedit) is consuming a big amount of time as
well.
Note in single-file mode the dwz invocations could be done in parallel
(likewise
the debug info extraction).  That would be rpms (find-debuginfo.sh) job.