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Doing something as "at the same time" as possible

#message-passing#process
thoughtarray

thoughtarray

Doing something as "at the same time" as possible

I know beam makes a scheduler per CPU (OS thread); so theoretically I can do something at exactly the same time up to the number of CPUs I have.

What is the best way to kick them all off at the same time? Is my only option to send (via Process.send or Kernel.send) a message to a process running on each scheduler? If I do that, the messages are sent out serially. Any alternative techniques or should that be considered fast enough in this ecosystem?

I posted a similar post, but I think it was too complex to bother with.

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benwilson512

benwilson512

Author of Craft GraphQL APIs in Elixir with Absinthe

The type of question you’re asking I think requires some definitions. There is, at the end of the day, no such thing as truly “at the same time” there is “measured to be within a time bound by an observer”. How tight does the time bound need to be? Why? Who is observing this?

3
Post #2
schneebyte

schneebyte

You could check how others are doing it.

Maybe you could tell your processes to start at a specific point in time
https://www.erlang.org/doc/man/erlang#monotonic_time-0
then just have them sleep and check time repeatedly.

/one more thing
I don’t think you can choose the specific scheduler a process is on.
:erlang.system_info(:scheduler_id)
I guess if you spawn enough processes under load it should be spread out to all available schedulers.

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