Appserver4RPG is opensource, extendable, base layer of ArdGate (running in > 100 installations in production, since about 10 years). It's multithreaded (using a threadpool), it has extended logging capabilities (log4j), wich could be used for profiling the application.
Running a single instance (one JVM), you could create your QR-Codes (or whatever you want) from multiple as400 jobs.
You could have multiple installs on the same box, running independable from each other (each of them using a JVM of its own).
You could run the java part of an installed instance on another box in your network (this could be as400, i5, system i, i or any other box with an installed JVM - linux, windows, aix...)
This would provide (nearly) unlimited scalability and could be implemented in less than 2 days.

D*B

<Karl>
So I've wrote a small ZXING Java program and a colleague a DataQ server
program to prevent multiple starts of the JVM.

But it's still too slow! For 1000 QR Codes needs my i9 3 Min and the
customer talks about 2 Million documents with a QR-Code.
</Karl>

I remember a similar discussion in a german forum and by phone...

What is the exact requirement?
2 million should take how long?

D*B


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