On 22/10/2021 2:46 am, A T & T Management wrote:
Java, it has to be translated each time it run, provided you know the
language and it's been debugged. Schools may teach it but they too want to
make money and look good because they can say it's modern and that is what they
push. Any CEO or executive who doesn't look at the total cost is doomed to
fail.
Don't write off Java too quickly. I previously posted about Software
Drag Racing, which was a competition to test the speed of different
languages.
In the initial test on z/OS, Java was over 3 1/2 times faster than C++.
With some tweaking, C++ ran as fast as Java, but not significantly faster.
The results are written up here:
https://www.blackhillsoftware.com/news/2021/08/10/java-vs-c-drag-racing-on-z-os/
If you have a zIIP and your general purpose CPs are not full speed, Java
might be the fastest language on your system by a big margin... and it
doesn't count against general purpose CP usage.
Java will compile to machine code where it makes a difference to
performance. Just in Time compilation has some performance advantages:
- it can optimize for the exact hardware
- it can leave out infrequently used code paths and compile them later
if they are actually required, making the machine code smaller and more
efficient
- it can monitor the code execution and recompile the hottest parts with
extra optimizations
IBM also talks a lot about RNI and processor cache... it turns out
garbage collection is good for cache efficiency too. It moves all the
active data into a smaller chunk of memory, which makes better use of
processor cache and is good for your RNI.
If you have well defined, well understood programs that are big CPU
users, it certainly could be worth rewriting them in Java.
(Knowing the language and debugging programs applies to any language...
and I'm not denying you can write large programs and inefficient code in
Java as much as in any other language.)
Andrew Rowley
Black Hill Software
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