Hi Gary

the Hello World sample is not a real application. It brings up the JVM for just 
a 
few statements and doesn't even use the optimization/caching provided for 
often requested functions. Try to run a real Java application. Of course it's 
more overhead compared to old cobol applications, but it might save a lot of 
development resources and in these days young people don't know about 
cobol. We run two Java applications on the z/OS one runs the whole day using 
JMS and JDBC and performance isn't that bad.

Roland

>Does anyone have any tuning/performance references/links for Java under 
z/OS?
>
>Some tentative footsteps were taken to develop Java apps to run under USS 
and the "Hello World" app sucked down 30% of the CPU during the time the 
app was running. :(  So, I gotta prepare for the onslaught when things really 
kick into high gear.

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