From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,FREEMAIL_FROM
	autolearn=unavailable autolearn_force=no version=3.4.4
Path: 
 eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!news.eternal-september.org!feeder.eternal-september.org!aioe.org!.POSTED!not-for-mail
From: Victor Porton <porton@narod.ru>
Newsgroups: comp.lang.ada
Subject: Re: Why does Ada compile slower than Python?
Date: Wed, 04 Oct 2017 00:08:57 +0300
Organization: Aioe.org NNTP Server
Message-ID: <or0u97$1hot$1@gioia.aioe.org>
References: <oqugga$1j1c$1@gioia.aioe.org>
NNTP-Posting-Host: 9OC/PY8QRnnqnNGuo4rrrw.user.gioia.aioe.org
Mime-Version: 1.0
Content-Type: text/plain; charset="ISO-8859-1"
Content-Transfer-Encoding: 7Bit
X-Complaints-To: abuse@aioe.org
User-Agent: KNode/4.14.10
X-Notice: Filtered by postfilter v. 0.8.2
Xref: news.eternal-september.org comp.lang.ada:48328
Date: 2017-10-04T00:08:57+03:00
List-Id: <comp.lang.ada>

Victor Porton wrote:

> Why does Ada compile much slower than Python, even in absence of
> optimization?
> 
> We can usually get a Python source files and immediately run it.
> 
> But with Ada we would need to wait a considerable amount of time till it
> compiles.
> 
> Why?

Hm,

$ time gnatgcc -c test.adb 

real	0m0.068s
user	0m0.064s
sys	0m0.000s
$ time python3 test.py
XXX


real	0m0.040s
user	0m0.032s
sys	0m0.004s


-- test.adb
with Ada.Text_IO; use Ada.Text_IO;

procedure Test is
begin
   Put_Line("XXX");
end;


# test.py
print("XXX\n");


$ gnatgcc --version
gnatgcc (Debian 7.2.0-8) 7.2.0

According this test (valid only for very short programs) compiling Ada is 
slower only two times.

Maybe I was under a wrong impression, because I got this impression when I 
compiled tens of Ada files in a row and my brain was focused on total 
compilation time rather than compilation time for one file?

Is GNAT really much slower than Python? or was it a false impression?

This issue is quite practical: I am going to build a server which will 
execute (in a secure sandbox) XML converters downloaded from the Web written 
in different interpreted languages. By "interpreted" I mean "compiling 
quickly". Can we agree to count Ada as an interpreted language in this 
sense?

-- 
Victor Porton - http://portonvictor.org