[erlang-questions] How to test multi-pollset?

pablo platt pablo.platt@REDACTED
Mon Jan 29 10:19:19 CET 2018

It's great to see all the hard work invested in performance in master.

On Mon, Jan 29, 2018 at 10:49 AM, Lukas Larsson <lukas@REDACTED> wrote:

> Hello,
> On Mon, Jan 29, 2018 at 9:22 AM, pablo platt <pablo.platt@REDACTED>
> wrote:
>> Hi,
>> What is the expected effect of the multi-pollset PR [1] on a UDP socket
>> on the sender/receiver side?
>> My use case is a media server with several broadcaster and many viewers.
>> Each stream use 1Mbps (aprox 100 * 1500 bytes packets per second).
>> Should I expect improvement when gen_udp is sending packets, receiving
>> packets or both?
> Yes, I believe that you will see an improvement. It depends on what type
> of HW that you are running on, typically the more logical cpu's you have
> the more gain you will get from the improvements in I/O polling[1]. Also
> the exact usage pattern matters.
>> Is it reasonable to pick a point in master and use it on a production
>> system after testing?
> I would take the latest tip of master and test that thoroughly for you
> application. The things that we merge into master have gone through all our
> testing before it is merged, so it is as stable as the maint branch.
> However we make a lot more changes in master than in maint, so because of
> that there will be a greater chance of some bug slipping through.
> If you do decide to give the improved I/O polling implementation a go,
> please do come back with any negative or positive findings that you get!
> Lukas
> [1]: The largest change in the PR is not actually the ability to use
> multiple pollsets, but that the polling has been lifted out to be done by
> dedicated threads.
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