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Subject: Re: Can't get over 100 client connections?
To: users@tomcat.apache.org
References: <B63D10721FE7744A8FC526A4D9DC3E1E726D3FD7@MSGEXSV21136.ent.wfb.bank.corp>
From: Christopher Schultz <chris@christopherschultz.net>
Message-ID: <ae9010fb-fb38-290e-6f85-3cc40e85bc1c@christopherschultz.net>
Date: Thu, 18 May 2017 01:05:47 -0400
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John,

On 5/16/17 1:57 PM, John.E.Gregg@wellsfargo.com.INVALID wrote:
> All,
> 
> I'm using Tomcat 7.0.75.
> 
> I cannot get my connection or thread count over 100 no matter how
> much load I throw at the server.  Currently I just have a dummy app
> deployed that doesn't do much except sleep for about 500ms and
> return a canned response.  Initially I had maxThreads=20 with no
> explicit maxConnections.  I could get the "current threads busy"
> metric to 20 easily.  Then I raised it to 100 and was able to reach
> that number easily.  Additionally, netstat told me I had 100
> incoming connections to port 5114.  However raising the maxThreads
> higher doesn't make any difference, nor does explicitly specifying
> maxConnections=200.  In either case, I can only get 100 busy
> threads and 100 active connections.  Once I reach that limit, the
> response times on the client start going up.  The Tomcat server
> itself isn't stressed at all.  CPU and GC are low.  The client is
> on a different server in the same data center.
> 
> I'm not going through a load balancer.  I'm going directly to the
> connector below:
> 
> 
> <Connector port="5114" protocol="HTTP/1.1" SSLEnabled="true" 
> maxConnections="200" maxThreads="200" maxKeepAliveRequests="100" 
> keepAliveTimeout="10000" scheme="https" secure="true" 
> clientAuth="true" sslProtocol="TLS" 
> keystoreFile="/app/comp/myapp/certs/appcerttestkeystore" 
> keystorePass="${keystore.password}" keyAlias="test" 
> truststoreFile="/app/comp/myapp/certs/cacerts" 
> truststorePass="${truststore.password}" 
> allowUnsafeLegacyRenegotiation="false" ciphers="blah blah blah" />

What is the benchmark client and how do you invoke it?

- -chris
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