Re: Java->RPG, *SERIALIZE required?

In regard to the single-threaded RPG process being a bottleneck, the same
would be true if you rewrote the RPG code in Java. You'd have to implement
some form of serialization in your Java code, which is normal.

Multi-threaded processes have bottlenecks. For example, in one benchmark
study developers kept increasing the number of threads in Websphere
Application Server, thinking that would increase CPU utilization across a
multi-CPU server. But that didn't work. The threads were bottle-necked.
They ended up launching a number of WAS instances, equal to the number of
CPUs on the server as the means of maxing out CPU consumption.

As Mark and I suggested, you might pair a pool of Java threads with a pool
of RPG jobs and implement some form of inter-process communication to
remove the bottleneck.


On Fri, Mar 6, 2020 at 11:58 AM Justin Taylor <JUSTIN@xxxxxxxxxxxxx> wrote:

Multiple JVM threads would be calling the same RPG procedure concurrently,
which would cause a bottleneck since the RPG would be single-threaded.

The RPG code is already available as a webservice, it just seems silly for
a native IBMi job to have to call a local webservice to run an RPG
program. Que sera, sera!

Thanks guys :)



-----Original Message-----
From: Nathan Andelin [mailto:nandelin@xxxxxxxxx]
Sent: Friday, March 06, 2020 12:26 PM
To: RPG programming on IBM i <rpg400-l@xxxxxxxxxxxxxxxxxx>
Subject: Re: Java->RPG, *SERIALIZE required?

Because it's multi-threaded, and a single-threaded bottleneck would be
undesirable.

Now I'm curious about what you might be comparing thread(*serialize) to?
I assume you understand that calling Java methods must also be serialized
in muti-threaded Java processes. That's just normal practice within
multi-threaded Jobs. The fact that RPG code might be single-threaded has
nothing to do with it.

An alternative would be to communication between a pool of Java threads
and a pool of RPG servers via data queues or some other form of
inter-process communication.

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