[erlang-questions] Erlang distribution links don't fully utilise available resources - OTP 22.0.2 - Why?

[Gerhard Lazu]

Our zdbbl defaults to 128000. This PR exposes how much of the zdbbl is
being used: https://github.com/erlang/otp/pull/2270

We've tried larger values - 1280000 - which increase memory usage and make
throughput marginally better (~1%), but spikier.



On Tue, Jun 18, 2019 at 10:40 PM Michael Truog <mjtruog@REDACTED> wrote:

> On 6/18/19 2:14 PM, Gerhard Lazu wrote:
> > https://github.com/erlang/otp/pull/2291 is an improvement for larger
> > payloads, not so much for smaller ones.
> >
> > 60 KB - 13.6 Gbit/s (down from 14.4 Gbit/s)
> > 120 KB - 12.8 Gbit/s (down from 14.4 Gbit/s)
> > 10MB - 8.8 Gbit/s (up from 7.6 Gbit/s)
> > 100MB - 5.8 Gbit/s (up from 4.3 Gbit/s)
> >
> > This is OTP 22.0.2
> >
> https://grafana.gcp.rabbitmq.com/dashboard/snapshot/SDr2EWgaD2KOX5i0H154UvzoHRS68FV0
> >
> > This is OTP 22.0.3 + PR 2291
> >
> https://grafana.gcp.rabbitmq.com/dashboard/snapshot/8yxY61o140gvAKXFthgIVCes2oW2Owa7
> >
> >
> > Will try https://github.com/erlang/otp/pull/2293 tomorrow
> >
> You should also try using the erl command line option +zdbbl when
> testing larger payloads (it defaults to 1024 KB with valid values from 1
> - 2097151 KB).
>
> Best Regards,
> Michael
>
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