QUESTIONS ABOUT EVALUATING TOMCAT WITH TPC-W

[jiang ying <jc...@hotmail.com>]

     Hi.
     When I run the TPCW bookstore application, I found the server behave 
erratic.
     Experiment enviroment:
     Hardware: a client PC, two server PCs. Each PC has two 1.59 GHz AMD 
Opteron, 2GB RAM, and a 30 GB disk. One server machine runs theWeb server 
and application server software, while the other contains the database. All 
the machines run 2.4 Linux Kernel and are connected through a LAN of 
1000Mb/s. 
     Web Server: Tomcat 5.5.12
     Database: mysql 5.0.18
     Client Workload Generator: the freely available Java TPC-W 
implementation developed by the PHARM research group at the University of 
Wisconsin-Madison http://www.ece.wisc.edu/~pharm/tpcw.shtml
     The file descriptor limit has been increased to 8192.
     The maxconnection of Tomcat is 1000.
     To solve the heap exception of Tomcat, JAVA_OPTS='-Xms256m -Xmx256m' 
is set. 
     Q1: When I emulate 400 EBs ( the command line: java rbe.RBE -EB 
rbe.EBTPCW1Factory 400 -OUT run1.m -RU 100 -MI 600 -RD 100 -WWW 
http://tomcatserver:8080/ -CUST 288000 -DEBUG 2") , the tomcat memory drops 
severly from 1G to 5M. 
     Q2: Sometimes the tests complete without any error. In other runs when 
getting Html from Tomcat, the ioexceptions of  url.openStream() are caught 
and the client is returned with "Unable to open the html ....".
     Could you kindly tell me why the tomcat cosumes so much memory? And 
what may cause the ioexception of getting html? Does it correlate with the 
implementation of TPCW?
     Thank you.

                                                yours cylinder

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