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Use multiprocessing to run in parallel. When operating on multiple projects, this can greatly speed things up. Across 1000 repos, it goes from ~40sec to ~16sec with the default -j8. The output processing does not appear to be a significant bottle neck -- it accounts for <1sec out of the ~16sec runtime. Thus we leave it in the main thread to simplify the code. Change-Id: I750b72c7711b0c5d26e65d480738fbaac3a69971 Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/297984 Reviewed-by: Chris Mcdonald <cjmcdonald@google.com> Tested-by: Mike Frysinger <vapier@google.com>