RE: [Help-glpk] Re: glpk 4.34 release information

[Meketon, Marc]

Luiz,

I'm not an expert on the compilation flags, so please double check what
I'm trying to say in the following.

The "CFLAGS" set for VS2008 is:  /I. /DHAVE_CONFIG_H /nologo /W3

I do not know what the corresponding settings are for MinGW.

It does not appear that any flag for optimization (such as /O2, /GL,
etc.) is turned on for VS2008.  I think that a comparison should be made
between the two compilers when both have their optimization for speed
settings adjusted to be as fast as possible.

-Marc

-----Original Message-----
From: address@hidden
[mailto:address@hidden On
Behalf Of Luiz M. M. Bettoni
Sent: Saturday, December 06, 2008 8:37 AM
To: address@hidden
Subject: RE: [Help-glpk] Re: glpk 4.34 release information

Hi, Marc.

This topic make me test some models with distinct builds of GLPK:
http://lists.gnu.org/archive/html/help-glpk/2008-11/msg00026.html

In 2 "good" machines (AMD Athlon64 2.200MHz, 2Gb DDR-400 / Intel Core 2
Duo 2x 2133 MHz, 2Gb DDR2-667), just replacing the glpsol.exe (all
parameters still the same, i'm using all cuts), VS2008 build (from
http://winglpk.sourceforge.net) cannot beat MinGW in all my tests. Off
course, simple models are solved instantaneously, but on some of my huge
problems i can see times like 80s vs 270s, for example.

Maybe we can make a lot of tests and summarize it (using different
machines, some different models from MIPLIB 2003) to be a "pointer" to
users make a choice. Just a pointer, not "the answer to all problems".
Look, maybe a transportation problem in amd processor run faster with
VS2008 build, but a plan scheduling in a intel run better with MinGW
build
(or not?).

Best Regards,
Luiz


Em 6/12/2008 04:11, Meketon, Marc escreveu:
> Luis,
>
> I am curious that your MinGW execution times are so much faster than
> the VS2008 times.  Would you know if the various optimization
> parameters are turned on for VS2008?
>
> -Marc
>>
>> I didn't use the VS2008 build 'cause it is much slower then MinGW
>> build. On all my tests with several models in GMPL, the MinGW version
>> take less than a half of VS2008 version time...






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