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With `parallel.fork` data cannot be shared between processes using shared memory, except for arrays. `multiprocessing.Manager` supports sharing data via pipes or sockets using pickle as serialization. This patch adds a minimal subset of `multiprocessing.Manager` to `parallel`, supporting shared lists and dicts. If parallel mode is disabled, a fake manager is returned which creates regular lists and dicts, eliminating overhead of serialization, transfering and deserialization.
`Topology.trim` can be quite slow if the levelset is expensive and maxrefine is large. Although the work is embarrassingly parallel, this was not exploited, because we can't make a shared memory array of element.Reference objects. With the newly added `parallel.Manager` we have an alternative way of sharing data between processes: using pickle and pipes. This patch adds support for parallel trimming using the `parallel.Manager.list`.
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parallelize Topology.trim