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

From: Meketon, Marc
Subject: RE: [Help-glpk] Re: glpk 4.34 release information
Date: Sat, 6 Dec 2008 09:16:23 -0500


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.


-----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:

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 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
(or not?).

Best Regards,

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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