[erlang-questions] VM leaking memory

Fred Hebert <>
Thu Jan 31 23:52:48 CET 2019


On 01/31, Scott Ribe wrote:
>> On Jan 31, 2019, at 3:26 PM, Frank Muller <> wrote:
>>
>> The refc binary is the one using most of VM’s memory (in GB) compared to other allocators (few MB).
>
>So, could be the classic leak where you match on a binary and pass a sub-binary to another process? That creates a ref to the original binary, and if the first process is a long-lived one that doesn't gc often, even though the second one finishes, the original binary hangs around...

Yeah, that's a good bet. I'd check in the new feature where a sub-binary 
of a large binary is taken, and would call `NewBin = binary:copy(Bin)` 
on it to free the ref as early as possible.


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