[erlang-questions] Cowboy vs Misultin

Andy W. Song <>
Tue May 31 10:08:59 CEST 2011


I guess Misultin's handle_data function has some problem if TCP packets are
large, perhaps larger than ethernet MTU.

If I use 1536+2 WebSocket packet size, I got follow error form Misultin(I
fill up char 'M' with my packet):

http process <0.515.0> has died with reason: {function_clause,
                                              [{misultin_websocket,
                                                handle_data,

["MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM",
                                                 [],#Port<0.1012>,<0.516.0>,
                                                 http,true,<0.40.0>]},

 {misultin_websocket,connect,4},

 {misultin_http,handle_data,9}]}, removing from references of open
connections

On Tue, May 31, 2011 at 2:18 PM, Andy W. Song <> wrote:

> I installed R14B03.
>
> I'm disappointed with my Erlang WebSocket client's performance.  So I wrote
> a C version using libev, code attached.
> Usage:
> ./new A B C
> A/B/C have the same meaning of Erlang client.
>
> Here is the result with my new client:
>
> misultin_websocket_binary_example(file attached, no change to rest of
> Misultin)
> start 519M
> 3.5G
> CPU,  with 550 Kbyte/s traffic about 23%.
>
> misultin_websocket_example
> start 519M
> 3.5G
> CPU, with 550 Kbyte/s traffic about 25%.
>
> Packet size is 512 bytes, client sends packets, server echo.
>
> Cowboy can't pass my test this time. Connections start dropping from 20K,
> don't know why.
>
> Regards
> Andy
>
> On Mon, May 30, 2011 at 10:20 PM, Roberto Ostinelli <>wrote:
>
>> 2011/5/30 Andy W. Song <>
>>
>>> Version 14.a-dfsg-3 is what comes with Debian stable. It's on my company
>>> machine which now doesn't have internet access anymore.
>>>
>>> Debian splits Erlang to a bunch of small packages. I may download a
>>> single Erlang/OTP package and install manually later on.
>>>
>>> Thanks
>>> Andy
>>>
>>
>> misultin has just been updated in the master branch [0.8-dev] to support
>> binary mode.
>>
>> i would be very interested if you could redo your tests using the binary
>> example for websockets:
>>
>> https://github.com/ostinelli/misultin/blob/master/examples/misultin_websocket_binary_example.erl
>>
>> let's see if loic hit the spot :)
>>
>> r.
>>
>
>
>
> --
> ---------------------------------------------------------------
> 有志者,事竟成,破釜沉舟,百二秦关终属楚
> 苦心人,天不负,卧薪尝胆,三千越甲可吞吴
>
>


-- 
---------------------------------------------------------------
有志者,事竟成,破釜沉舟,百二秦关终属楚
苦心人,天不负,卧薪尝胆,三千越甲可吞吴
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