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   <H1>[99s-extend] Cowboy HTTPS connection memory usage</H1>
    <B>Lo&#239;c Hoguin</B> 
    <A HREF="mailto:extend%40lists.ninenines.eu?Subject=Re%3A%20%5B99s-extend%5D%20Cowboy%20HTTPS%20connection%20memory%20usage&In-Reply-To=%3C50D44BD3.4030008%40ninenines.eu%3E"
       TITLE="[99s-extend] Cowboy HTTPS connection memory usage">essen at ninenines.eu
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    <I>Fri Dec 21 12:45:23 CET 2012</I>
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<PRE>On 12/21/2012 04:34 AM, rambocoder wrote:
&gt;<i> Does anybody know either from benchmarks or real world data what is the
</I>&gt;<i> average memory footprint of each concurrent HTTPS connection to cowboy?
</I>
I don't have anything, sorry. I'm guessing it consumes a lot more than 
TCP though.

&gt;<i> SSL app in Erlang reuses SSL session-ids so I am not sure if the Apache
</I>&gt;<i> Bench I test with reuses the session id or it does not.
</I>
I wouldn't know, but I wouldn't trust Apache Bench doing the right 
thing. Any other benchmark tool usually works better in my experience.

&gt;<i> BTW, what makes an erlang api &quot;documented&quot; vs &quot;undocumented&quot;. For
</I>&gt;<i> example ssl:session_info/1 function here (
</I>&gt;<i> <A HREF="https://github.com/erlang/otp/blob/maint/lib/ssl/src/ssl.erl#L411">https://github.com/erlang/otp/blob/maint/lib/ssl/src/ssl.erl#L411</A> ) has
</I>&gt;<i> a spec and a short doc, but session_info is not described
</I>&gt;<i> <A HREF="http://www.erlang.org/doc/man/ssl.html">http://www.erlang.org/doc/man/ssl.html</A> .ssl:session_info/1 is a useful
</I>&gt;<i> function to be able to track if the load generator is reusing the SSL
</I>&gt;<i> session_id or it is generating new one, because that would make all the
</I>&gt;<i> difference during measurement due to Erlang caching SSL sessions by default.
</I>
The documentation is separate (they're not using edoc). It's perhaps not 
deemed useful enough for documenting it. I wouldn't worry about using it 
for measurements though.

Try asking Ingela on the ML about it, perhaps they just forgot to 
document it.

-- 
Lo&#239;c Hoguin
Erlang Cowboy
Nine Nines
<A HREF="http://ninenines.eu">http://ninenines.eu</A>

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