Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Subscribe:	<mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive:	<http://sources.redhat.com/ml/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-help AT cygwin DOT com>, <http://sources.redhat.com/ml/#faqs>
Sender:	cygwin-owner AT cygwin DOT com
Mail-Followup-To:	cygwin AT cygwin DOT com
Delivered-To:	mailing list cygwin AT cygwin DOT com
To:	cygwin AT cygwin DOT com
X-Injected-Via-Gmane:	http://gmane.org/
Path:	not-for-mail
From:	Marcus Elderic Koenig <elderic AT t-online DOT de>
Newsgroups:	gmane.os.cygwin
Subject:	gcc 3.1 slower than 2.95?
Date:	Mon, 17 Jun 2002 12:58:45 +0000 (UTC)
Organization:	none
Lines:	109
Message-ID:	<Xns9230986E41EE6marcuselderickoenig@80.91.224.249>
NNTP-Posting-Host:	pd9511f0e.dip.t-dialin.net
X-Trace:	main.gmane.org 1024318725 21092 217.81.31.14 (17 Jun 2002 12:58:45 GMT)
X-Complaints-To:	usenet AT main DOT gmane DOT org
NNTP-Posting-Date:	Mon, 17 Jun 2002 12:58:45 +0000 (UTC)
User-Agent:	Xnews/5.04.25

now I compiled gcc 3.1 and tested it and I got confused again :)

everywhere I read 3.1 being about 30% faster than 2.95, but my tests 
show the exact opposite.

I did compile with:

./configure --enable-threads=win32
make bootstrap
make install

and I did set the library_path to the correct paths.

now when I compile the following source with gcc3 (previously compiled 
with gcc 2.95), I get the following results:

------------------------------------------------------------------------

// STL includes
#include <iostream>
#include <set>
#include <ctime>
#include "benchmark.h"

// namespaces to use
using namespace std;

int main() {

	set<float> storage;
	headroom__base::benchmark bench;
		
	bench.start();
	
	int i;
		
	cout << "inserting... " << endl;
						
	for (i = 0; i < 500000; i++) {
			
		storage.insert(i);
		storage.insert(3.14);			
			
	};

	cout << "insert ready." << endl
	     << "inserted floats: "
           << storage.size() << endl << endl
           << "referencing... " << endl;
			 
	set<float>::const_iterator setPos;
		
	for (i = 0; i < 500000; i++) {
		
		setPos = storage.find(i);
					
	};

	cout << "referencing ready." << endl << endl;
	
	cout << "in one second, I do "
           << CLOCKS_PER_SEC << " ticks." << endl
	     << "all this took me " << clock() << " ticks and "
	     << bench.stop() << " seconds." << endl;
			
    	return 0;

};

------------------------------------------------------------------------

-> gcc 2.95 
g++ -O2 -mcpu=pentium -Wall settest.cpp -lwinmm

-> gcc 3.1
g++ -O3 -mcpu=pentium -Wall settest.cpp -lwinmm


results:

C:\elderic\source\compiler speedtest>"gcc 2.95.exe"
inserting...
insert ready.
inserted floats: 500001

referencing...
referencing ready.

in one second, I do 1000 ticks.
all this took me 1902 ticks and 1.852 seconds.

C:\elderic\source\compiler speedtest>gcc3
inserting...
insert ready.
inserted floats: 500001

referencing...
referencing ready.

in one second, I do 1000 ticks.
all this took me 3594 ticks and 3.665 seconds.

----------------------------------------------------------------

this is not 30% faster, but about 70% slower????????????

can someone please tell me why this happens???

-elderic



--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Bug reporting:         http://cygwin.com/bugs.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/

- Raw text -