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From: Niklas Holsti <niklas.holsti@tidorum.invalid>
Newsgroups: comp.lang.ada
Subject: Re: Benchmark Ada, please
Date: Sat, 05 Jul 2014 15:00:55 +0200
Organization: Tidorum Ltd
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Xref: number.nntp.dca.giganews.com comp.lang.ada:187373
Date: 2014-07-05T15:00:55+02:00
List-Id: <comp.lang.ada>

On 14-07-05 14:34 , Guillaume Foliard wrote:
> Victor Porton wrote:
> 
>> Somebody, write an Ada benchmark for this comparison of programming
>> languages:
>>
>> https://github.com/jesusfv/Comparison-Programming-Languages-Economics
> 
> Here is it:

 [most of code snipped]

>    Cpu_Time_End := Ada.Execution_Time.Clock;

I have a question about this, see below.

>    Ada.Text_IO.Put_Line
>       ("Elapsed time is ="
>        & Ada.Real_Time.To_Duration (Cpu_Time_End - Cpu_Time_Start)'Img);
> end Rbc_Ada;
> ---------------------------------------------------------------------
> 
> This is mostly a line to line translation from RBC_CPP.cpp. I have
> added a few type declarations though.
> 
>> It seems that C++ was the fastest (faster than Fortran), but Ada may be
>> even faster.
> 
> Here are the numbers with GNAT GPL 2014 on a Core2 Q9650 @ 3.00GHz:
> 
> $ gnatmake -O3 rbc_ada.adb
> $ time ./rbc_ada
> ...
> Elapsed time is = 1.966112682
> 
> 
> As for the C++ version:
> 
> $ g++ -o testc -O3 RBC_CPP.cpp
> $ time ./testc
> ... 
> Elapsed time is   = 3.12033

Are you sure that Ada.Execution_Time.Clock gives numbers that can be
compared with the get_cpu_time() function in the C++ version? For a
program running under an OS, it is not evident what should be included
in the "processor time" for a program (program loading, process
creation, interrupts, I/O, page faults, ...).

What did the "time" command output in your tests?

Just to be sure that the claim "Ada is faster" is really motivated.
Which would be very nice.

-- 
Niklas Holsti
Tidorum Ltd
niklas holsti tidorum fi
      .      @       .