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From Peter Lin <wool...@gmail.com>
Subject Re: How many connections can be made to Tomcat on Windows?
Date Tue, 14 Sep 2004 15:55:18 GMT
just out of curiousit, you're running Tomcat on windows server right?

in the even you're using windows professional, it is limited to 10
inbound connections, which is easy to overlook and forget.

I've easily gone over 1000req/sec for static files. For real pages
that hit the database, that's another story. Unless you're doing some
caching on the web tier, it's unlikely a 4CPU database server can
handle that many queries per second. The only way a webpage that gets
data from the database for every request to reach 1000 req/sec is if
the queries themselves take 50ms or less.

on a 4 cpu box
1000ms/50ms = 200 queries/second
200 queries/sec X 4 = 800.

Does that help?

peter


On Tue, 14 Sep 2004 17:38:20 +0200, Jorge Sopena <jsopena@sidsa.es> wrote:
> Hi everybody,
> 
> I'm having a problem with the maximun connections in Tomcat.
> In theory, the number of connections accepted by Tomcat is determined by
> the <Connector> elements in the server.xml configuration file. The
> maxProcessors attribute sets the total number of threads that can run
> simultaneously and the acceptCount attribute controls the number of
> requests that may be queued waiting for a connection.
> 
> I've done my own program to send hundreds of requests concurrently, but
> the response in the majority is
> "Exception:java.net.ConnectException:connection refuse"
> I did several tests, and I realized that if I send a request each
> 20mseconds I can send around 200 requests without problems.
> But if I send, for example 20 requests uninterruptedly, 4 or 5 requets
> are rejected with java.net.ConnectException.
> If I increae the number of requests the problem is even worst.
> 
> I'm using tomcat 5.0, and the configuration in my server.xml is:
>  <Connector port="8080"  maxThreads="300" minSpareThreads="25"
> maxSpareThreads="75"
>               enableLookups="false" redirectPort="8443" acceptCount="100"
>               debug="0" connectionTimeout="20000"
>               disableUploadTimeout="true" />
> 
> So, is the problem because of Tomcat and I should configure anything
> else? or
> should I customize something in the JVM or Windows?
> 
> My goal is to be able to serve 1000 requests/second. Any hint how to do it?
> 
> Thanks, in advance.
> 
> Jorge sopena
> 
>

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