Re: Can AccessLogValve Cause Tomcat Performance Hit?

[Tim Funk]

Yes I can believe there is a performance hit. The valve reparses the string 
on every request. Since the Valve also uses a SimpleDateFormtatter - I think 
it is also restricted by the sync block imposed by that class.

-Tim

Dan Barron wrote:

Hello,

We are seeing a performance hit to our server whenever we turn on 
AccessLogValve for a virtual host in tomcat. Is this common or has 
anyone else experienced this?  Any suggestions on how to configure for 
optimal performance?

Below is the virtual host entry in server.xml - tomcat is running stand 
alone on a Red Hat 9 Linux box - the box is dedicated to running tomcat 
- there are two virtual hosts configured for the server, and only one 
has any real traffic.

     <Host name="www.mysite.net" debug="0" appBase="webapps"
            unpackWARs="true" autoDeploy="true"
            xmlValidation="false" xmlNamespaceAware="false">
         <!-- <Alias>www.mysite.net</Alias> -->
          <Logger className="org.apache.catalina.logger.FileLogger"
                  directory="logs"  prefix="mysite.net." suffix=".txt"
                  timestamp="true"/>
          <Valve className="org.apache.catalina.valves.AccessLogValve"
                 directory="logs/mysite.net-acesslogs"
                 pattern="%t %a %A %h %m %p %U"
                 prefix="access_log." suffix=".txt"
                timestamp="true"/>
          <Context path="" docBase="mysite.net/production" debug="0"/>
      </Host>
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