[erlang-questions] erlang woes

[Joseph Wayne Norton]

Please check this patch for R13B04 - I believe it will fix your memory  
leak.

http://hibari.git.sourceforge.net/git/gitweb.cgi?p=hibari/patches;a=blob;f=otp_src_R13B04-httpc-memoryleak.patch;h=14eb7a603dc7f0f49f6685260dd0d0bebddc2f4c;hb=HEAD

This patch was posted previously to one of the erlang.org mailing lists.

I don't know your application's requirements but I would recommend most of  
these patches for a vanilla R13B04 erlang system:

http://hibari.git.sourceforge.net/git/gitweb.cgi?p=hibari/patches;a=tree

Instructions for applying these patches can found here:

http://hibari.sourceforge.net/webpage-README-ERL.html#_erlang_otp_to_download

regards,


On Thu, 05 Aug 2010 22:55:27 +0900, Evans, Matthew <mevans@REDACTED>  
wrote:

> Are you using pg2 in a distributed system? There is a known (should be  
> fixed) bug where pg2 was eating memory like crazy.
>
> -----Original Message-----
> From: erlang-questions@REDACTED [mailto:erlang-questions@REDACTED]  
> On Behalf Of Arun Suresh
> Sent: Thursday, August 05, 2010 1:37 AM
> To: erlang-questions@REDACTED
> Subject: [erlang-questions] erlang woes
>
> Hello folks..
>
> Ive been using erlang for a while now.. and ive got a production system  
> up
> and running from scratch.. but there are some really annoying aspects of  
> the
> platform.. the most fundamental of which is the fact that when a node
> crashes it is very hard to figure out exactly why.. Almost ALL the time  
> what
> i see in the crash dump is something akin to :
>
> =erl_crash_dump:0.1
> Wed Aug  4 21:50:01 2010
> Slogan: eheap_alloc: Cannot allocate 1140328500 bytes of memory (of type
> "heap").
> System version: Erlang R13B04 (erts-5.7.5) [source] [smp:2:2] [rq:2]
> [async-threads:0] [hipe] [kernel-poll:false]
> Compiled: Tue May 11 12:37:38 2010
> Taints:
>
>
> at which point I start to comb the sasl logs... and 9 out of 10 times...  
> it
> is because some critical process has died and the supervisor is busy
> restarting it.. for example, the other day.. my node crashed and from the
> sasl logs.. i see that the http manager for a profile I had created had
> crashed like so :
>
> =CRASH REPORT==== 4-Aug-2010::21:47:09 ===
>   crasher:
>     initial call: httpc_manager:init/1
>     pid: <0.185.0>
>     registered_name: httpc_manager_store
>     exception exit: {{case_clause,
>                          [{handler_info,#Ref<0.0.17.61372>,<0.17225.36>,
>                               undefined,<0.15665.36>,initiating}]},
>                      [{httpc_manager,handle_connect_and_send,5},
>                       {httpc_manager,handle_info,2},
>                       {gen_server,handle_msg,5},
>                       {proc_lib,init_p_do_apply,3}]}
>       in function  gen_server:terminate/6
>     ancestors: [httpc_profile_sup,httpc_sup,inets_sup,<0.46.0>]
>     messages: [{'EXIT',<0.16755.36>,normal},
>                   {connect_and_send,<0.16752.36>,#Ref<0.0.17.61366>,
>
>
> and subsequent messages were related to the supervisor trying to restart  
> the
> profile manager... and failing..
>
> Now my point is... why did the node have to crash.. just because the  
> manager
> has to be restarted ?
> and why does the crash.dump always keep telling me im out of memory..
>
> The problem is.. I thought erlang was built to be fault tolerant.. the
> choice of me using erlang had a LOT to do with doing away with the  
> having to
> code defensively.. "let it crash" and all that .. just make sure u have a
> supervisor that restarts ur process and everything will just work fine...
> but my experience is that most of the time.. simple process restarts  
> bring
> the whole node crashing down...
>
> Would deeply appreciate it someone could tell me if there is something
> fundamentally wrong with the way im doing things.. or if anyones been in  
> my
> situation and have had some enlightenments.
>
> thanks in advance
> -Arun
>
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-- 
norton@REDACTED