[erlang-questions] Sending messages to non-existing process

Frank Muller <>
Fri Jan 25 17:59:25 CET 2019


Thank you for the clarification.

/Frank

You already have it on the senders heap created in the line above.
> If receiver exists at any point, there will be a copy to receivers heap.
> If receiver never existed, then no new copies will be made.
>
> On Fri, 25 Jan 2019 at 16:19, Frank Muller <>
> wrote:
>
>> Hey Dmytro
>>
>> So no matter if receiving process exists or not, those 100000000 messages
>> have to be copied on the sender’s heap until next garbage collection is
>> performed? Did I get it correctly?
>>
>> /Frank
>>
>> 1. A lookup of the process is performed in the dictionary of all pids.
>>> 2. Having null result, the message is dropped (and remains in sender's
>>> heap until the next garbage collection)
>>>
>>> There should be no side effect other than the cost of locking/unlocking
>>> processes dict for that lookup.
>>> Sudden process registration should from that moment have all messages
>>> copied into the receiving heap, one copy per send, creating 100000000
>>> copies on the receiver heap.
>>>
>>>
>>> On Fri, 25 Jan 2019 at 15:50, Frank Muller <>
>>> wrote:
>>>
>>>> Hey guys
>>>>
>>>> Is there any side effect of sending an infinite stream of messages to a
>>>> non-existing process registered by name?
>>>>
>>>> Ex.
>>>> 1> Term = ….
>>>> 2> register(foo, self()).
>>>> 3> 1 / 0.
>>>> 4> [ foo ! Term || _ <- lists:eq(1. 10000000000000) ].
>>>>
>>>> I’m curious about how the VM handles this scenario internally:
>>>>
>>>> 1. messages are simply discarded? And if this the case, will this hurt
>>>> the VM’s performances?
>>>> 2. something else???
>>>>
>>>> Finally, what will happen if during the sending, a process get
>>>> registered with name 'foo' ?
>>>>
>>>> Thanks in advance
>>>> /Frank
>>>>
>>> _______________________________________________
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>>>> 
>>>> http://erlang.org/mailman/listinfo/erlang-questions
>>>>
>>>
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