More detailed preface description

2023-01-30 14:09:09 -05:00
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 ``tractor`` is a `structured concurrent`_, multi-processing_ runtime
 built on trio_.
-Fundamentally ``tractor`` gives you parallelism via ``trio``-"*actors*":
+Fundamentally, ``tractor`` gives you parallelism via
-our nurseries_ let you spawn new Python processes which each run a ``trio``
+``trio``-"*actors*": independent Python processes (aka
 non-shared-memory threads) which maintain structured
 concurrency (SC) *end-to-end* inside a *supervision tree*.
 Cross-process (and thus cross-host) SC is accomplished through the
 combined use of our "actor nurseries_" and an "SC-transitive IPC
 protocol" constructed on top of multiple Pythons each running a ``trio``
 scheduled runtime - a call to ``trio.run()``.
 We believe the system adheres to the `3 axioms`_ of an "`actor model`_"