Re: [Help-glpk] Re: GLPK MingW build files and PyGLPK

[Luiz M. M. Bettoni]

At 26/11/2009 14:35, Andrew Makhorin wrote:
> Under cygwin gcc is run with default options '-g' (that includes
> debugging info into the executable) and '-O2'. On my 32-bit windows
> machine I build glpk using 'make CFLAGS=-O3', and the code is about
> 30% faster than the one built with MSVS 2010 'cl -O3'.
>   
I've experienced some issues using O3 cflag in past, but using O2 all 
looks great.

30% faster? Good. How you timed this? Testing some models using both 
builds (and some others, like MingW), I've seen that there is no build 
that runs all models in better time. Maybe in specific operations (like 
DB access or problem generation) it can be timed, but not in solve 
process (the longest task when reduce time become a problem).

A note about GUSEK: building with cygwin the binary needs cygwin dll, a 
little big add to the package. And, if I presume that cygwin dll is as a 
system prerequisite, GUSEK will not be self-portable.