OTOH - the problem could be the writing of log data to disk.
-Tim
Dan Barron wrote:
Certainly one understands the costs of adding processing in the pipeline, but AccessLogValve seems to come with a large price to performance even with DNS lookups turned off and minimal fields being saved in the output. We have turned it off for now and tomcat performance is significantly improved.
Any other methods to get access logs out of Tomcat w/o using AccessLogValve? I suppose I could write my own, but would prefer a known solution.
Dan Barron Destination Software LLC [EMAIL PROTECTED]
At 05:57 AM 4/7/2004, Shapira, Yoav wrote:
Hi, How can you expect the addition of ANY component to the processing pipeline NOT to cause a performance hit? Of course AccessLogValve adds something, nothing comes for free. You can control the hit by modifying what you're logging and disabling DNS lookups, as others have suggested.
Yoav Shapira Millennium Research Informatics
>-----Original Message----- >From: Dan Barron [mailto:[EMAIL PROTECTED] >Sent: Wednesday, April 07, 2004 2:09 AM >To: Tomcat Users List >Cc: Dan Anderson >Subject: Can AccessLogValve Cause Tomcat Performance Hit? > >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> > >Thanks in advance! > >Dan Barron >[EMAIL PROTECTED]
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