On Dec 14, 2007, at 2:40 PM, Michael Poil wrote:
--------SNIP-------------------
Sometimes it is impossible to do that as is the case with Java. The
amount
of storage used within the JVM has a static component based on user
definitions, but after that it is a function of what the Java
program is
doing and there is no way the calculate that as it is completely
dynamic
and can vary from one run to another based on what the program
does. It
also depends on how the customer has set up LE, CTG, DB2 etc. etc., so
there are other variables to make it even harder. You can get typical
sizes for the application by experience.
Not trying to excuse Java, it is just how the software works. Storage
creep can also be due to the way that the users write their code,
it is
not always the fault of the software vendor.
It would be nice if everything was straight-forward in this world,
but it
refuses to play ball.
To me this comes down to the difference between the PC world and the
mainframe. In the mainframe world we do not like to deal with
unknowns the way the PC world seems to love them. They can always
come back with a we need more request (STORAGE DASD etc) and get away
with it because they can always point the finger at someone else. The
mainframe world doesn't do this (most of the time) as we like to
quantify and have specific numbers in mind so we can cost things out
in the PC world hey what's another 64G or whatever and the cost is
vary little (compared to the MF world). In our world we have to
justify everything to the penny. The PC world says throw money at it
and it will fix everything.
So when you bring a PC world concept (JAVA) into the MF world there
is going to be a LOT of hostility between the two. What really scares
me is that JAVA was probably rewritten for the MF without the years
and years of experienced IBM design philosophy and debugging. Now we
are JUST starting to see the dragon without its clothes on.
Ed
Ed
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