[erlang-questions] Throughput on Yaws 1.68 / OTP R11B-3 / Suse Linux 10.2?

Torbjorn Tornkvist tobbe@REDACTED
Mon Mar 3 15:44:05 CET 2008

You could perhaps try the iserve-server provided by Sean Hinde:


This way you get the minimal turnaround in Erlang, just to
get an idea if the bottleneck is in Yaws or somewhere else.


Francesco Cesarini wrote:
> We've been running some stress tests on a system receiving http posts 
> from a load tool. No matter how hard we push the system, and no matter 
> how many instances of the load tool we install, we can not increase the 
> throughput.
> We are hitting each web server node with 8,000 simultaneous inets http 
> client connections (ibrowse, at those levels generates huge message 
> queues and runs @ 100% cpu), sending messages as quickly as they can. 
> The load machines are running at 10 - 15% system CPU. Once the requests 
> have passed through the inets driver and the yaws layer, we are unable 
> to handle more than 1000 sustained hits per second. The hardware is 
> running at about 50% System CPU.  K-poll is enabled, as are 255 io 
> threads. Hitting the system in the API used by Yaws, we have managed to 
> achieve a sustained throughput in excess of 3,000 requests per second.
> We are in the process of replacing Yaws with a light weight web server, 
> but our gut feeling is that the bottle neck is in the inets driver. 
> Benchmarks using the pico server a few years back (on much more modest 
> hardware) resulted in excess of 3,000 requests per second. While we are 
> doing it, it would be useful to hear if others have experienced similar 
> bottlenecks in similar architectures?
> Thanks,
> Francesco
> --
> http://www.erlang-consulting.com

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