[erlang-questions] Memory Leak

andrew mmc <>
Wed May 27 14:22:14 CEST 2009


That's a great help, thankyou... started me on the path to finding a
solution to this very frustrating problem!
Many thanks,

Andrew

On Wed, May 27, 2009 at 8:46 AM, Gordon Guthrie <>wrote:

> Andrew Mmc wrote:
>
> > What is the best way to find out what is going on and what the cause of
> this
> > leak is?
>
> erlang:processes/0 will return a list of erlang processes
>
> You can use erlang:process_info/2 to introspect them for a number of
> different things
>
> erlang:process_info(PID, [total_heap_size, message_queue_len]) is
> probably the right place to start.
>
> We track memory problems by using a tick function that looks at alive
> processes every 10th of a second, sorts 'em on heap size and then logs
> the top 5 memory hogs to a disk file.
>
> Graph it up in Excel and job's a good 'un.
>
> Other things you might want to log are total number of processes which
> you can get by length(erlang:processes()) or using
> erlang:system_info/1 with appropriate parameters.
>
> Gordon
>
> On Tue, May 26, 2009 at 2:10 PM, andrew mmc <> wrote:
> > Hello, all,
> > I have a system that involves spawning lots of processes to work on the
> same
> > set of data.  Each process reports to one of a number of listener
> processes
> > that collate the results and determines the next bit of work to do.
>  There
> > is also a fair amount of inter-process communication.  I have found that
> > pretty quickly, erlang runs out of memory.
> > What is the best way to find out what is going on and what the cause of
> this
> > leak is?
> > Thanks for your help,
> > Andrew
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