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From: Robert Dewar <robert_dewar@my-deja.com>
Subject: Re: Apex vs GNAT on solaris
Date: 1999/12/08
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In article <82lcr0$tsg$1@nnrp1.deja.com>,
  reason67@my-deja.com wrote:
> BTW: Both compilers were set at no optimization.


That statement tends to imply that you think the above statement
is relevant to someting or other in your measurements.

It is not!

The code generation techniques of Rational and GNAT are quite
different, and one thing you will find is that some compilers do
a fair amount of optimization even with all optimization turned
off (from one point of view, you could say that running faster
with optimization off is an indication that the compiler does
not have the (sometimes important) capability of really
suppressing all optimization.

In other words, we are reading your thread whose title sure
implies some competitive comparison, and now perhaps we think
that for some tests (but not all) running more SLOWLY might
indicate the preferred behavior. This is sure not the way most
people run or interpret benchmarks, and in particular you
mention showing the results to management -- I am pretty sure
they will be likely to misinterpret them :-)

Note that for a meaningful comparison of ACES quicklook, you
should most certainly make sure that all relevant optimizations
are on (probably -O2 -gnatn, maybe -funroll-loops, for GNAT, I
do not know what the appropriate Apex options might be).


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