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#1904 - Clearing up performance aspects of using ask

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Viktor Klang 2012-03-16 13:53:32 +01:00
parent 807843591c
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akka-docs/java/untyped-actors.rst
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@ -287,6 +287,13 @@ Messages are sent to an Actor through one of the following methods.
Message ordering is guaranteed on a per-sender basis.
.. note::
There are performance implications of using ``ask`` since something needs to
keep track of when it times out, there needs to be something that bridges
a ``Promise`` into an ``ActorRef`` and it also needs to be reachable through
remoting. So always prefer ``tell`` for performance, and only ``ask`` if you must.
In all these methods you have the option of passing along your own ``ActorRef``.
Make it a practice of doing so because it will allow the receiver actors to be able to respond
to your message, since the sender reference is sent along with the message.