On 15/05/2021 3:33 pm, David Crayford wrote:
Java is not viable on z/OS without zIIP engines.
I don't believe that is true. zIIP engines give you 3 things:
1) Savings in software cost.
2) Full speed CPUs, if your general purpose CPs are not full speed
3) Very often, they are less utilized than the general purpose CPs so
you spend less time waiting for dispatch.
#3 may be significant, but nothing runs well if it isn't being
dispatched - that isn't a Java problem.
The other factor that gives Java a bad reputation is that it allows you
to bring applications to z/OS that were written with the assumption that
they were the main thing running on the system and there is CPU to
spare. This isn't how most people run their z/OS systems. I suspect this
is the root of your Tomcat problem, but that is a Tomcat issue not a
Java issue.
Java will run as well as any other work on general purpose CPs - but you
lose the software cost savings.
Andrew Rowley
Black Hill Software
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