From: John Carter <ECE AT dwaf-hri DOT pwv DOT gov DOT za>
Organization: Dpt Water Affairs & Forestry (IWQS)
To: djgpp AT sun DOT soe DOT clarkson DOT edu
Date: Fri, 13 Oct 1995 12:26:40 +0200
Subject: GNAT vs C++ performance.

Greetings All,

I am contemplating moving to GNAT ADA for my next project, but before 
I do, I would like to know how the performance compares with DJGPP 
C++.

I DON'T want to start a flame war on the relative merits of the 
languages. Merely a friendly couple of questions about run time 
performance. I am expecting to do some fairly compute intensive tasks 
and I can't cope with factor 3 or more speed decrease.

Does anyone have the results on...
1) Runtimes of an integer op intensive program.
2) Runtimes of a floating point intensive program.
3) Runtimes of the ADA fixed point type vs C++ floats.
4) Compile times for similar programs.

I don't need anything fancy, just really simple programs that 
you may have lying around in both C++ and ADA. I'm not after 
precision, just a rough idea.

And lastly, have you come accross any hidden gotcha's that might bite 
one while trying to write a major program. Eg. Crippled I/O, memory 
limits, no graphics etc. etc.

Thanks muchly,


John Carter
Institute for Water Quality Studies. Department of Water Affairs.
Internet : ece AT dwaf-hri DOT pwv DOT gov DOT za  Phone    : 27-12-808-0374x194      
Fax : 27-12-808-0338 [Host for Afwater list server]

Let's keep this matter in perspective. One insignificant galaxy, one 
of the thousands of millions of galaxies, has a small yellow sun on 
its outer rim. About this sun orbits a molten iron ball. On the 
surface of this ball is a very thin crust of silica slag. This crust 
is partly coated by a microscopically thin layer of carbon hydrogen 
compounds. Some of which has delusions of grandeur.