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From Mark Thomas <>
Subject Re: attempting to achieve 100K concurrent websocket connections on Tomcat 7.0.48 NIO
Date Fri, 01 Nov 2013 23:17:54 GMT
On 01/11/2013 23:15, Mark Thomas wrote:
> On 01/11/2013 22:00, Bob DeRemer wrote:
>> QUESTION: I'm looking for some advice on what Tomcat NIO connector
>> settings to use to support 100K concurrent websocket connections.
>> Hopefully I  can reach this goal through a combination of Tomcat NIO
>> Connector settings, and Server 2008 R2 configuration [if needed].
>> BACKGROUND: We're scale testing our websocket application and looking
>> to see how many concurrent websocket connections we can get on a
>> single Tomcat instance - with the goal being 100K.  I've provided the
>> test landscape details at the bottom - all VERY BIG EC2 instances
>> over 10 GB network, so memory, CPU and network do not appear to be
>> the problem when monitoring.
>> PROBLEM: The problem we are running into is that we can't seem to
>> establish even 50K connections into Tomcat.  At some point, we start
>> getting connect failures, similar to the following:
> OK. Win 2k8 R2, 16GB RAM, bunch of other stuff running, client and
> server on same machine, no tuning. I get 16,313 connections before it
> falls over. That is consistent with the defaults which should allow a
> maximum of 16384 (given I have other stuff running).
> (I'll commit the test to trunk shortly).

For those that want to play with this themselves.

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