[erlang-questions] Memory usage in OTP 21

[Lukas Larsson]

Hello,

On Fri, Jul 27, 2018 at 10:11 PM Devon Estes <devon.c.estes@REDACTED>
wrote:

> I hope this helps jog some ideas as to what might be going on here, and
> thanks again for any help y'all can offer.
>

I think I have figured out what is going on. It seems to be the allocation
of the term containing the garbage_collection_info that is messing with
measurements. I'll try to change the code inside process_info to give a
more accurate view of the current memory usage, however as long as the call
to process_info happens in the process doing the call there will be some
miss match.

I would suggest that you instead do a call to erlang:garbage_collect()
before and after the benchmark is run and rely on tracing to get the
correct information. Alternatively you could call erlang:process_info on
the process from the trace collector, though then you would need some type
of synchronization in between the processes.

I have not been able to reproduce the scenario you mentioned where the
heap_block_size is increased without getting a trace message. What code did
you run to trigger that? As always an Erlang example would be preferable,
but I should manage with an Elixir one as well.

Lukas
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