On 3/03/2023 1:36 am, David Spiegel wrote:
Every time I've watched mainframe Java since OS/90 V1, it has been
painfully slow. Have you ever watched a WAS startup? ... It takes
about 15 minutes on the fastest mainframes.
I think that's a reflection on WAS, not Java.
When I was playing with the software drag racing, I compared the times
from SMF to get an idea of the Java startup etc. overhead.
For a 5 second elapsed time of 5 seconds timed inside the program, SMF
showed:
C++ : 5.02 seconds elapsed, 4.95 seconds CPU time
Java: 6.16 seconds elapsed, 5.24 seconds CPU time.
So the overhead to start Java looked to be around 1 second elapsed, and
1/4 second of CPU time. After the startup, Java was as fast as C++ in
this test.
--
Andrew Rowley
Black Hill Software
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