Even if the cost of creating new actors is low, there is still a cost, its 
lifecycle for example has to be ran per actor creation,
a mailbox has to be created and that adds up to the GC, you could even use 
specific mailboxes for these set of actors that are inside a router,
for example, I use two types of "faster" and "cheaper" mailboxes for 
worker's like actors, like:

https://gist.github.com/guidomedina/ddd729492c8fb8148032

That way my workers are always ready to process whatever.
Just my opinion though,

Guido.

On Wednesday, June 29, 2016 at 10:41:52 PM UTC+1, Guido Medina wrote:
>
> *Correction:* is actors.size(), not value.size(), value came from the 
> original code which iterates over a Map, something else, which is my DDD 
> shard distributor:
>
> On Wednesday, June 29, 2016 at 10:40:20 PM UTC+1, Guido Medina wrote:
>>
>> Here is how to create your Router programmatically:
>>
>> final List<ActorRef> actors = ...
>> Router router = new Router(new RoundRobinRoutingLogic(), 
>> actors.stream().map(ActorRefRoutee::new).
>>             collect(toCollection(() -> new ArrayList<>(actors.size())));
>>
>> In this case I'm using RoundRobinRoutingLogic, you can use any of the 
>> pre-defined ones or you could implement your own.
>> You want the size of that list to be something like:
>>
>> *Runtime.getRuntime().availableProcessors()* * *N* where N in [1..4]
>>
>> HTH,
>>
>> Guido.
>>
>

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