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

Francesco Cesarini francesco@REDACTED
Mon Mar 3 16:13:11 CET 2008

Just the one I had in mind when mentioning benchmarks from a few years ago..


Torbjorn Tornkvist wrote:
> You could perhaps try the iserve-server provided by Sean Hinde:
>  http://www.tornkvist.org/gitweb?p=iserve.git;a=summary
> This way you get the minimal turnaround in Erlang, just to
> get an idea if the bottleneck is in Yaws or somewhere else.
> --Tobbe
> 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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