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From Christopher Schultz <ch...@christopherschultz.net>
Subject Re: What is the best connector configuration for thousands of mostly idle users?
Date Fri, 07 Feb 2014 19:54:40 GMT
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Jesse,

On 2/6/14, 10:11 PM, Jesse Barnum wrote:
> Problem summary: My nio polling threads are using too much CPU
> time.

AFAIK, the NIO "poller" doesn't really poll. It's more like an event
processor. It should use very little CPU time.

> Application overview: My application has from 1,300 - 4,000 users
> connected at any given time. Each user sends about 200 bytes, then
> waits 30 seconds, then sends about 200 bytes, and this just loops
> for each user.

You're using standard HTTP with long keepalives, right? It sounds like
this application is ripe for a re-architecture around Websocket or
something similar.

> Each user connects with SSL, and we use a long keepalive to ensure 
> that the HTTP connection doesn't close, so that we don't have to 
> renegotiate SSL.
> 
> Configuration: Ubuntu 12.0.4 with Tomcat 7.0.35, 1.75 gigs of RAM.
> 
> We are using Apache with SSL and mod_proxy_ajp to forward requests
>  to Tomcat. It has MPM module enabled, with 500 ThreadsPerChild,
> so we typically have from 3-9 Apache instances running.
> 
>> <IfModule mpm_worker_module> ServerLimit         12 ThreadLimit
>> 1000
>> 
>> StartServers         1 MinSpareThreads      25 
>> MaxRequestsPerChild 0 MaxSpareThreads     500 ThreadsPerChild
>> 500 MaxClients          5000 </IfModule>

If you are expecting long keepalive times with a huge amount of
activity on each one, you might want to switch to the "event" MPM,
which is httpd's version of Tomcat's NIO connector.

You might be able to get away with fewer threads under the event MPM
as well.

- -chris
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