[erlang-questions] Investigate an infinite loop on production servers

[Morgan Segalis]

I have launch the etop on my computer monitoring the production server… hoping that I will see something wrong !

Thank you for your help so far (to All).

I'll come back to you as soon as I have more information with etop.

Morgan.

Le 23 mai 2013 à 07:38, Vance Shipley <vances@REDACTED> a écrit :

> On Thu, May 23, 2013 at 04:00:07AM +0200, Morgan Segalis wrote:
> }  I'm having a bit of an issue with my production servers.
> 
> You will find that etop is your friend:
> 
> 	http://www.erlang.org/doc/apps/observer/etop_ug.html
> 
> Run etop from the command line and sort on the column you're
> interested in.  To watch memory usage:
> 
> 	etop -node tiger@REDACTED -sort memory
> 
> This will list the processes by memory size in decreasing order.
> This shows you the memory hogs.  Watch it as it starts to get 
> into trouble and you should see where the memory is getting used.
> 
> As Bob points out the most common problem is that a process's 
> inbox will start to fill up.  Once this starts happening it's
> the beginning of the end.  Another process may start eating up
> memory and the node may crash because it has requested more than
> is available bt the root cause was that one process not having
> time to service the messages at the rate they are received.
> 
> To watch for message queue lengths:
> 
> 	etop -node tiger@REDACTED -sort msg_q
> 
> The above will list the processes in decreasing order of inbox
> size.  They should all be zero, and sometimes one, normally.  If
> you have a problem you'll see one process stay at the top and it's
> message queue length will start to grow over time.
> 
> -- 
> 	-Vance