Re: Announcing JGNAT public version 1.0p

[Robert Dewar <robert_dewar@my-deja.com>]

In article <8ckscp$nv7$1@nnrp1.deja.com>,
  hugin777@my-deja.com wrote:
> On my machine (with gcc -O3) Java is 3 times faster !!  (Due
> to Pentium optimizations, I guess)

No, most likely because you did not use the right options
for the GNAT run, there are many peformance considerations in
doing a comparison like this.

For instance, -O3 is usually a bad idea compared to -O2,
but likely you should unroll loops, probably you should
suppress checks too if you are comparing with Java which
has no arithmetic runtime checking.

You may also be seeing artifacts in overhead, we often find
that primitive benchmarks like this are badly flawed.

Of course the main reason for programing in Ada rather than
Java is not efficiency, but rather that Ada is a superior
language to Java in many respects. I would base the choice
primarily on language requirements, unless efficiency becomes
known to be a significant issue.


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