Re: Running .Net Natively on IBMi

I think if you're main point is the general superiority of ILE over PASE (which I agree), the position of "PASE isn't native" is just a distraction.



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From: Nathan Andelin <nandelin@xxxxxxxxx>
Sent: Friday, January 12, 2018 5:20 PM
To: Midrange Systems Technical Discussion
Subject: Re: Running .Net Natively on IBMi

On Fri, Jan 12, 2018 at 3:27 PM, Justin Taylor <JUSTIN@xxxxxxxxxxxxx> wrote:

IMO, if "x" runs as an active job on IBMi, it's native.

My definition of "native" has additional qualifications. I'll try to
explain why. If you and others do not agree with my perspective, or my
rationale, then that unfortunately leaves us without a common
understanding.

PASE is quite literally a subset of AIX. PASE applications are quite
literally AIX applications:

- PASE doesn't run on top of the technology independent machine interface.
It rather uses a "syscall" interface.
- PASE doesn't utilize single level store.
- PASE objects are little more (if anything) than stream files.
- PASE is an operating environment that is essentially separate from IBM i.
- PASE runs in Power PC mode rather than Amazon 64-bit mode.
- PASE uses a memory address space that is separate from the one used by
IBM i.
- PASE doesn't run ILE or OPM language programs.
- PASE does run several language environments that don't run on IBM i.

In regard to "active jobs", the ones that bind to PASE typically load a
full-fledged language environment such as Java, Node.js, PHP, Python, Perl,
Ruby. Those Jobs typically have CPU and Memory requirements that amount to
something like 50 times that of an ILE program.

The IBM i virtual machine may run tens of thousands of Jobs that activate
ILE programs, and manage those workloads without breaking a sweat. But you
can destabilize a machine by launching and running more than a few hundred
PASE jobs.

The way that IBM i manages workloads is a critical distinction from the way
that PASE manages workloads, and also how multi-threaded language
environments like Java manage threads.

To me it doesn't make sense to look at a Job that binds to PASE, and not
make a mental note of the distinctions from ones that run in the "native"
virtual machine.