Justus Winter writes:

 > But currently Mailman3 does fork+exec, so it doesn't get to share
 > the parent's pages.  I experimented with fork-and-dont-exec [0],
 > but the results were underwhelming, because reference counting can
 > cause pages to diverge.  Surprisingly, gc.freeze didn't seem to
 > help much, so there may have been issues beyond the reference
 > counts.
 > [...]
 > I think Python just doesn't support sharing code across processes
 > well.

Seems likely.  I know that Emacsen have always advised running just
one process for this reason (also because users usually want all their
recent hacks available in all buffers, but memory hogging is a big

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