[erlang-questions] Examining Erlang crash dumps - how to account for all memory?

Magnus Falk magnus.falk@REDACTED
Tue Jul 12 01:00:23 CEST 2011

Turns out that the problem was twofold: The heap is listen in words not
bytes and I forgot to convert, also I shouldn't have counted the unused
portions of the heap since they are already included in the other numbers.

So all the memory is now accounted for, now I just have to figure out why
the usage explodes like that...


On Sat, Jul 9, 2011 at 7:14 AM, Jon Watte <jwatte@REDACTED> wrote:

> Certain objects, such as binaries and ets tables, live in different memory
> than that of each process. If you have lots of those, then that might
> explain the rest of the memory.
> Also, if you look at what each process is doing, is any process "garbing"?
> If so, it probably is using more memory temporarily for the new block it's
> compacting into.
> Sincerely,
> jw
> --
> Americans might object: there is no way we would sacrifice our living
> standards for the benefit of people in the rest of the world. Nevertheless,
> whether we get there willingly or not, we shall soon have lower consumption
> rates, because our present rates are unsustainable.
> On Fri, Jul 8, 2011 at 7:28 AM, Magnus Falk <magnus.falk@REDACTED> wrote:
>> This is a copy of a question I asked over at StackOverflow that noone has
>> been able to answer yet:
>> http://stackoverflow.com/questions/6616101/examining-erlang-crash-dumps-how-to-account-for-all-memory
>> I've been poring over this Erlang crash dump where the VM has run out of
>> heap memory. The problem is that there is no obvious culprit allocating all
>> that memory.
>> Using some serious black awk magic I've summed up the fields Stack+heap,
>> OldHeap, Heap unused and OldHeap unused for each process and ranked them by
>> memory usage. The problem is that this number doesn't come even close to the
>> number that is representing the total memory for all the processes
>> processes_used according to the Erlang crash dump guide.
>> I've already tried the Crashdump Viewer and either I'm missing something
>> or there isn't much help there for my kind of problem.
>> The number I get is 525 MB whereas the processes_used value is at 1348 MB.
>> Where can I find the rest of the memory?
>> Cheers,
>> Magnus
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