Process

Persistence

checkpoint

how to save and reserve from checkpoint

State machine

A process is also a `state machine<https://en.wikipedia.org/wiki/Finite-state_machine>`_ which can be in one of the following states:

• CREATED

• RUNNING

• WAITING

• FINISHED

• EXCEPTED

• KILLED

as defined in the ProcessState enum.

                  ___
                 |   v
CREATED (x) --- RUNNING (x) --- FINISHED (o)
                 |   ^          /
                 v   |         /
                WAITING (x) --
                 |   ^
                  ---

* -- EXCEPTED (o)
* -- KILLED (o)

• (o): terminal state

• (x): non terminal state

How state transition

Remote Controller

control remote process (designate by pid)