[erlang-questions] Creating a diagnostic memory dump of live erlang VM

Vladimir Ralev <>
Wed Feb 19 14:22:39 CET 2014


This observer http://www.erlang.org/doc/man/observer_app.html ? I can't see
such functions in there?


On Wed, Feb 19, 2014 at 3:08 PM, Dan Gudmundsson <> wrote:

> Have you tried observer?
> Shows message boxes and gen_server states and more.
>
>
>
> On Wed, Feb 19, 2014 at 1:25 PM, Vladimir Ralev <>wrote:
>
>> From what I've seen the crashdump doesn't really have any of the objects
>> in the memory. If I have a string stuck in some mailbox or even just state
>> inside a gen_server process, can I see it?
>>
>>
>> On Wed, Feb 19, 2014 at 7:20 AM, Geoff Cant <> wrote:
>>
>>> Provided you're prepared to take down the node, you can
>>> erlang:halt("crashdump") and you'll get a dump of memory, heaps, tables,
>>> ... - erl_crash.dump file.
>>>
>>> You can view this in a web browser with crashdump_viewer.
>>>
>>> Crashdump debugging is unfortunate, but extremely useful. I use it on
>>> all my production systems.
>>>
>>> -G
>>>
>>> > On 18/02/2014, at 16:00, Vladimir Ralev <>
>>> wrote:
>>> >
>>> > Hello all,
>>> >
>>> > As a Java developer I really miss being able to create a "heap dump"
>>> of a live Erlang VM where I can see the objects in each process and the
>>> current process stack variables/trace. I realise there is no java-like heap
>>> in Erlang but there are the processes, mailboxes, stacks, file handles,
>>> sockets, ets and so on.
>>> >
>>> > In Java we can also use query tools to search the heaps for specific
>>> identifying strings/numbers/timestamps to find a graph of related objects.
>>> You can go find objects by type or find the stack variables for given
>>> thread. It would be very useful for understanding the system in production
>>> and diagnose issues.
>>> >
>>> > Would it be possible to have something like this in Erlang or it is
>>> fundamentally not allowed?
>>> > _______________________________________________
>>> > erlang-questions mailing list
>>> > 
>>> > http://erlang.org/mailman/listinfo/erlang-questions
>>>
>>
>>
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>
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