[Help-glpk] Building glpk with Intel C++ 11.0

[Andrew Makhorin]

Monday, December 8, 2008, 5:35:19 PM, you wrote:

> Very interesting.  This corresponds to Luiz's finding that MinGW (with
> -O2) is twice as fast as VS2008 without -O2.

> So I guess that the conclusion is to explicitly add the -O2 to the
> VS2008 build.  And then MinGW would be about the same speed as VS2008.

> [BTW, I have a special attachment to the dfl001 problem - thanks for
> including that in the benchmark!]


> -----Original Message-----
> From: Andrew Makhorin [mailto:address@hidden 
> Sent: Monday, December 08, 2008 5:26 AM
> To: glpk xypron
> Cc: Meketon, Marc; address@hidden; address@hidden
> Subject: Building glpk with vs2008

> Monday, December 8, 2008, 9:57:42 AM, you wrote:

>> Hello Mark,

>>> May I recommend to Andrew or Xypron that at least -O2 is set on for
> the
>>> VS2008 makefile?

>> thank you for your recommendations

>> Flag /O2 is described here
>> http://msdn.microsoft.com/en-us/library/8f8h5cxt.aspx
>> as a default setting for release builds.

>> Flag /GL is described here
>> http://msdn.microsoft.com/en-us/library/0zza0de8.aspx
>> Some caveats do exist:
>> "The format of files produced with /GL in the current version may not
>> be readable by subsequent versions of Visual C++."

>> I will test with these two flags.

>> Best regards

>> Xypron

> I did not find the difference between /O2 and /Ox (please see some
> benchmarks below). However, the code is about twice faster than without
> any optimization flags.

> (It is interesting to note that the number of simplex iterations is
> the same in all cases.)

> Andrew Makhorin

> ------------------------------------------------------------------------
> Solver:     glpsol 4.34
> Computer:   Intel Pentium 4 CPU 3GHz, 2GB of RAM
> Platform:   Windows XP 5.1 Build 2600 Service Pack 3
> Compiler:   Microsoft 32-bit C/C++ Optimizing Compiler
>             Version 15.00.30729.01 for 80x86
> Build:      w32/Build_GLPK_with_VC9.bat
> Test set:   Netlib LP collection <ftp://ftp.netlib.org/lp/data/>
> Cmd line:   glpsol --mps foobar.mps
> ------------------------------------------------------------------------
> CFLAGS = /I. /DHAVE_CONFIG_H /nologo /W3

> Problem    Iters   Time,s   Mem,Mb
> d2q06c      5398     11.0     5.8
> dfl001     38894    181.6    11.0
> greenbeb    2595      3.7     5.3
> pilot87     7952     53.8    12.2
> ------------------------------------------------------------------------
> CFLAGS = /I. /DHAVE_CONFIG_H /nologo /W3 /O2

> Problem    Iters   Time,s   Mem,Mb
> d2q06c      5398      6.2     5.8
> dfl001     38894    109.6    11.0
> greenbeb    2595      2.0     5.3
> pilot87     7952     31.2    12.2
> ------------------------------------------------------------------------
> CFLAGS = /I. /DHAVE_CONFIG_H /nologo /W3 /Ox

> Problem    Iters   Time,s   Mem,Mb
> d2q06c      5398      6.2     5.8
> dfl001     38894    109.8    11.0
> greenbeb    2595      2.0     5.3
> pilot87     7952     30.9    12.2
> ------------------------------------------------------------------------

Just for comparison (please see below).

(I used a 31-day evaluation version of IC++ 11.0 and the makefile for
VS2008, in which I simply replaced cl.exe by icl.exe.)

Andrew Makhorin

------------------------------------------------------------------------
Solver:     glpsol 4.34
Computer:   Intel Pentium 4 CPU 3GHz, 2GB of RAM
Platform:   Windows XP 5.1 Build 2600 Service Pack 3
Compiler:   Intel(R) C++ Compiler Professional for applications running
            on IA-32, Version 11.0
            Build 20081105 Package ID: w_cproc_p_11.0.066
Build:      w32/Build_GLPK_with_VC9.bat
Test set:   Netlib LP collection <ftp://ftp.netlib.org/lp/data/>
Cmd line:   glpsol --mps foobar.mps
------------------------------------------------------------------------
CFLAGS = /I. /DHAVE_CONFIG_H /nologo /W3 /Ox

Problem    Iters   Time,s   Mem,Mb
d2q06c      5334      5.5     6.2
dfl001     38762     99.7    11.0
greenbeb    2620      1.8     5.3
pilot87     7780     24.1    12.2
------------------------------------------------------------------------