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=ham autolearn_force=no version=3.4.4
X-Google-Thread: 103376,b49d3a703a4b4db5
X-Google-NewGroupId: yes
X-Google-Attributes: gida07f3367d7,domainid0,public,usenet
X-Google-Language: ENGLISH,ASCII
Path: 
 g2news1.google.com!postnews.google.com!i28g2000yqa.googlegroups.com!not-for-mail
From: Ada novice <posts@gmx.us>
Newsgroups: comp.lang.ada
Subject: Re: compiler settings in AdaGIDE
Date: Mon, 26 Jul 2010 07:12:05 -0700 (PDT)
Organization: http://groups.google.com
Message-ID: 
 <ead9d83d-fb71-42e5-a6f6-6e3e544cb165@i28g2000yqa.googlegroups.com>
References: 
 <c072b766-9241-4580-9447-4adeb6ed0573@x21g2000yqa.googlegroups.com>
	<e715e179-6053-4190-94d4-6a348f9ea635@q22g2000yqm.googlegroups.com>
	<02d1f899-ad8f-493b-8f64-3791868a1bdb@q35g2000yqn.googlegroups.com>
	<ceccf660-fd5a-42c1-8ef6-e4207d6d49ef@f33g2000yqe.googlegroups.com>
NNTP-Posting-Host: 193.11.22.91
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
X-Trace: posting.google.com 1280153526 29802 127.0.0.1 (26 Jul 2010 14:12:06
 GMT)
X-Complaints-To: groups-abuse@google.com
NNTP-Posting-Date: Mon, 26 Jul 2010 14:12:06 +0000 (UTC)
Complaints-To: groups-abuse@google.com
Injection-Info: i28g2000yqa.googlegroups.com; posting-host=193.11.22.91;
	posting-account=Rr9I-QoAAACS-nOzpA-mGxtAlZ46Nb6I
User-Agent: G2/1.0
X-HTTP-UserAgent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.8)
	Gecko/20100722 Firefox/3.6.8 (.NET CLR 3.5.30729),gzip(gfe)
Xref: g2news1.google.com comp.lang.ada:12579
Date: 2010-07-26T07:12:05-07:00
List-Id: <comp.lang.ada>

On Jul 26, 12:57=A0am, jonathan <johns...@googlemail.com> wrote:
> On Jul 25, 2:29=A0pm, Ada novice <po...@gmx.us> wrote:
>
> > Many thanks for all these precious information. The settings
>
> > -gnatnp -O2 -march=3Dnative -ffast-math -funroll-loops
>
> > was only 1 s faster (1537 s) as compared to using
>
> > -gnatVa -O3 -gnatn -funroll-loops -gnatf -gnato
>
> Interesting result. I repeated the 100 calls to
> COMPLEX_EIGENVALUES.Eigen ( P, W, V, FAIL) test on a
> 121 x 121 sized matrix.
> I still get the same big decrease in running time from the
> -ffast-math switch.

Maybe what I have in my code is not affected by the -ffast-math
switch.


> On a high percentage of ordinary problems (usually data
> analysis) I would not care at all about the increased
> running time, and I would not remove the checks. There
> is another class of program I write and these run for days
> or weeks. These I never stop optimizing and testing, and
> all checks are removed!

I would prefer to keep the -gnatn.

> > 2. In the specification -march=3D"machine architecture here", you use
> > native for the machine architecture. Does this apply to Intel
> > processors as well?
>
> I just checked the gcc man pages and found nothing at all about
> -march=3Dnative. =A0It helps a little on all the machines I've
> used and occasionally in the past it has helped enormously. =A0Just
> now I removed -march=3Dnative from the Generic_Complex_Eigenvalues
> test and running time went from 3.61 sec to 3.58 sec. When
> I remove it from the Jacobi benchmark, the program slows down
> slightly. So the switch seems to do something on my intel machine,
> but all I can say now is that the difference is very small and
> unpredictable.


Thanks for this information.

YC