WebSphere Studio Workload Simulator configuration

The parameter configuration file we passed to the workload generator engine was a modified version of the default WebSphere Studio Workload Simulator configuration provided with the DayTrader distribution. We specified the following parameter values:

• The number of simulated clients was set to four on the combo servers, three on Triplet 1 and 6 on Triplet 2. This number of clients enabled us to reach optimal throughput while keeping the system CPU between 90% and 97%.
• The time limit (length of our runs) was set to 10 minutes.
• The "element delay" (or "think time") was kept at 0.
• The "xml_interval" is the interval, in minutes, between successive snapshots of the output of the WebSphere Studio Workload Simulator. This output can be customized. Taking into account pages per second, transactions per second, and response time, we set the xml_interval to 5 minutes.

Below is a sample invocation of a WebSphere Studio Workload Simulator script for one triplet:

/var/iwl/bin/iwlengine -c 4 -e 0 -D on -r 10000 --enginename triplet1 --max_clients \
300 --xml_interval 5 --timelimit 600 -s /etc/iwl/common/trade6_lnweb1.jxs