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anyway in another experiment that i make different state types CA configurable

that leaves very minimum we pickle only the nodes

then making `TaskNode` and `Return` cacheable

so, reminder: things that run out of process always need to be CAd

i think that that will eventually be a separate boolean value on Nodes

yea, right now this is fixed manually, there can be a control by the engine

<https://rbcommons.com/s/twitter/r/3604/> s/subject_key/subject/ i make it a todo for the next review to be smart about CA nodes and the rest things

<https://rbcommons.com/s/twitter/r/3615/> for translating between nodes, states and their keys in engine, two issues, one i commented in rb will fix, the other is the same dependencies ordering issue, still need CA even in serial engine, don't know how to work around that.

<@U098ZNTCN>: thanks... will get out a review shortly

<@U098ZNTCN>: it doesn't seem like a problem that you need to CA in the serial engine... that makes sense because you're trying to use the cache, right?

your "for_multi_process" flag is probably just "always content-address" or something.

that seems to be the minimum amount pickling we need (plus caching)

<@U098ZNTCN>: but the other thing is, i don't know about having it be a global flag

i'm certain that the next performance thing we'll have to do is conditionally multiprocess

ie, run some things in process, and some out.

i see, then that's even simpler, the logic would just depend on request

<@U054MQUPL>: i'm embarking on <https://github.com/pantsbuild/pants/issues/3106> ... which packages are you touching?

currently: ``` src/python/pants/engine/exp/legacy/commands.py             | 41 +++++++++++------------------------------
 src/python/pants/engine/exp/scheduler.py                   |  5 +++++
 src/python/pants/pantsd/service/fs_event_service.py        |  3 +++
 src/python/pants/pantsd/service/scheduler_service.py       | 31 ++++++++++++++++++++++---------
 src/python/pants/pantsd/subsystem/pants_daemon_launcher.py |  9 +++++++—```