[erlang-questions] VM leaking memory

Gerhard Lazu gerhard@REDACTED
Fri Feb 1 12:49:31 CET 2019

A text file would work a lot better, the important information is missing
from your last screenshot.

This should fit binary_alloc stats for the first scheduler in a screenshot
(your system has 48 schedulers):

[_|[SCHED0|_]] = erlang:system_info({allocator, binary_alloc}),
io:format("~p~n", [SCHED0]).

On Fri, Feb 1, 2019 at 11:14 AM Frank Muller <frank.muller.erl@REDACTED>

> Here is the beginning of recon_alloc:snapshot/1.
> Yes, Lukas can help on this. VM’s memory management looks like a mystery.
> Hi Frank,
>> The binary_alloc seems to be the one misbehaving (not 100% sure, see
>>> attached screenshot).
>> I agree, it's your binary_alloc. How many single block carriers in
>> binary_alloc do you have? What about multi-block carriers? Can you share a
>> recon_alloc snapshot?
>>> Is there a way to tweak this allocator strategy SBC/MBC? Lukas Larsson
>>> maybe?
>> For us, RabbitMQ, defaulting to a lower multi-block carrier size (
>> +MBlmbcs <http://erlang.org/doc/man/erts_alloc.html#M_lmbcs>) as well as
>> changing the allocation strategy (+MBas
>> <http://erlang.org/doc/man/erts_alloc.html#M_as>) made a positive
>> difference. From the screenshot that you've shared, I am guessing that this
>> won't work for you. This is the process that we went through at RabbitMQ:
>> https://groups.google.com/forum/#!msg/rabbitmq-users/LSYaac9frYw/LNZDZUlrBAAJ
>> I found Lukas' Erlang Memory Management Battle Stories from 2014 to be a
>> great erts_alloc companion:
>> http://www.erlang-factory.com/static/upload/media/139454517145429lukaslarsson.pdf
>> & https://www.youtube.com/watch?v=nuCYL0X-8f4
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://erlang.org/pipermail/erlang-questions/attachments/20190201/5918dec6/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: IMG_6342.jpg
Type: image/jpeg
Size: 199468 bytes
Desc: not available
URL: <http://erlang.org/pipermail/erlang-questions/attachments/20190201/5918dec6/attachment.jpg>

More information about the erlang-questions mailing list