You may want to take a look at MIR (Medium Internal Representation)
which is a framework for writing JIT's. It's experimental but looks to
build on and improve LLVM. It supports codegen for s390x so should run
fine on z/OS.
[1] https://github.com/vnmakarov/mir
[2] https://github.com/dibyendumajumdar/ravi
On 28/2/23 20:57, René Jansen wrote:
That is interesting because I was benchmarking it years ago it was only slower
with programs that did a lot of external calls, and all programs with
arithmetic were a lot faster than the interpreter. Anyway, all very good
observations for new Rexx implementations. I share your observations about the
Object Rexx implementation, of which the garbage collection always was the
achilles heel. But did you test with the IBM implementation or the new 5.0.0
version? It seems to have become a lot faster over the years.
Is there a github repo with your benchmarks? Just because we are working on a
new, VM and bytecode based Rexx system.
René.
On 28 Feb 2023, at 13:49, David Crayford <dcrayf...@gmail.com> wrote:
On 28/2/23 20:41, René Jansen wrote:
Depending on what you test and what you want to see of course. You did use the
Rexx compiler?
Yes, and the REXX compiler was slower than the interpreter. I profiled it using
Application Performance Analyzer and it was spending 90% of it's time in
GETMAIN calls so it has sub-optimal memory management. The REXX compiler should
not be used if you are using medium to large stem variables or data stacks.
René.
On 28 Feb 2023, at 06:47, David Crayford <dcrayf...@gmail.com> wrote:
On 25/2/23 01:23, Farley, Peter wrote:
Python on the mainframe is pretty good, but still can't beat out Rexx in
performance even when the Rex script needs to use BPXWUNIX and friends to
access z/OS Unix file systems,
I have conducted a series of benchtests, and the results suggest that REXX is
not as fast as Python. In my testing, I compare the performance of C, Lua,
Python, and REXX, and the results are clear: C is the fastest, followed by Lua,
which is within an order of magnitude of C. Python comes next, within an order
of magnitude of Lua, and REXX consistently performs the poorest. In addition to
the performance factor, the vast Python ecosystem compared to the limited
options available for REXX also make it an easy decision. Python is also
simpler to extend with packages, while REXX requires more effort and
potentially complex steps, such as using modern libraries that require Language
Environment (LE).
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