gams/cplex option file

GAMS
1

Hi,
I want to create an option file in cplex solver.How can I that?

\

2

*To let GAMS know there is a user-defined option file - BEFORE THE *SOLVE STATEMENT
YourModelName.optfile=1;

*Your options ------ example
$onecho > cplex.opt
threads 4
nodefileind 2
workmem 2048
nodesel 2
varsel 3
$offecho

HTH.

Destin


On Mon, Jun 4, 2012 at 9:29 AM, esra wrote:

Hi,
I want to create an option file in cplex solver.How can I that?

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3

Hi Destin,
My gams file

model pipe /all/;
Options optcr=1e-4,reslim = 20000,iterlim = 1e9;
Option mip=cplex;
pipe.optfile=1;
SOLVE pipe minimizing PA using mip;
Display PA.l;
File output /pipe_cplex.txt/;

After I run gams, give below error

User supplied options:
startalg 1
mipsearch 1

No such option.
*solvefinal 0
fixoptfile fix.opt
No such option.


On 4 Haziran, 11:04, Destin Zed wrote:
*To let GAMS know there is a user-defined option file - BEFORE THE *SOLVE
STATEMENT
YourModelName.optfile=1;

*Your options ------ example
$onecho > cplex.opt
threads 4
nodefileind 2
workmem 2048
nodesel 2
varsel 3
$offecho

HTH.

Destin

On Mon, Jun 4, 2012 at 9:29 AM, esra wrote:

Hi,
I want to create an option file in cplex solver.How can I that?

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4

Esra,

Your piece of GAMS code doesn’t show where/how you introduced the CPLEX options. Anyway, the following should work for you.

model pipe /all/;
Options optcr=1e-4,reslim = 20000,iterlim = 1e9;
Option mip=cplex;
pipe.optfile=1;
SOLVE pipe minimizing PA using mip;

$onecho > cplex.opt
startalg 1
mipsearch 1
$offecho

Display PA.l;
File output /pipe_cplex.txt/;

HTH.
Destin.


On Mon, Jun 4, 2012 at 11:04 AM, esra wrote:

Hi Destin,
My gams file

model pipe /all/;
Options optcr=1e-4,reslim = 20000,iterlim = 1e9;
Option mip=cplex;
pipe.optfile=1;
SOLVE pipe minimizing PA using mip;
Display PA.l;
File output /pipe_cplex.txt/;

After I run gams, give below error

User supplied options:
startalg 1
mipsearch 1

No such option.
*solvefinal 0
fixoptfile fix.opt
No such option.


On 4 Haziran, 11:04, Destin Zed wrote:
*To let GAMS know there is a user-defined option file - BEFORE THE *SOLVE
STATEMENT
YourModelName.optfile=1;

*Your options ------ example
$onecho > cplex.opt
threads 4
nodefileind 2
workmem 2048
nodesel 2
varsel 3
$offecho

HTH.

Destin

On Mon, Jun 4, 2012 at 9:29 AM, esra wrote:

Hi,
I want to create an option file in cplex solver.How can I that?

–
“gamsworld” group.
To post to this group, send email to gamsworld@googlegroups.com.
To unsubscribe from this group, send email to
gamsworld+unsubscribe@googlegroups.com.
For more options, visit this group at
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  • Alıntıyı göster -

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5

Hi Destin
Thanks your answer I am new user so I don’t know how/where I
introduced the cplex opt.file
Programme give below error

Unable to open options file: C:\GAMS\GAMSPDF\CPLEX.OPT.
Unable to process options file.
Presolve found the problem infeasible or unbounded.

On 5 Haziran, 14:07, Destin Zed wrote:

Esra,

Your piece of GAMS code doesn’t show where/how you introduced the CPLEX
options. Anyway, the following should work for you.

model pipe /all/;
Options optcr=1e-4,reslim = 20000,iterlim = 1e9;
Option mip=cplex;
pipe.optfile=1;
SOLVE pipe minimizing PA using mip;

$onecho > cplex.opt
startalg 1
mipsearch 1
$offecho

Display PA.l;
File output /pipe_cplex.txt/;

HTH.
Destin.

On Mon, Jun 4, 2012 at 11:04 AM, esra wrote:

Hi Destin,
My gams file

model pipe /all/;
Options optcr=1e-4,reslim = 20000,iterlim = 1e9;
Option mip=cplex;
pipe.optfile=1;
SOLVE pipe minimizing PA using mip;
Display PA.l;
File output /pipe_cplex.txt/;

After I run gams, give below error

User supplied options:
startalg 1
mipsearch 1

No such option.
*solvefinal 0
fixoptfile fix.opt
No such option.

On 4 Haziran, 11:04, Destin Zed wrote:

*To let GAMS know there is a user-defined option file - BEFORE THE *SOLVE
STATEMENT
YourModelName.optfile=1;

*Your options ------ example
$onecho > cplex.opt
threads 4
nodefileind 2
workmem 2048
nodesel 2
varsel 3
$offecho

HTH.

Destin

On Mon, Jun 4, 2012 at 9:29 AM, esra wrote:

Hi,
I want to create an option file in cplex solver.How can I that?

–
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6

Hello,

I have some problems about to form a “cplex.opt” and get the errors below and
I googled but I can not solve the problem. In addition I cannot chande the
default with option THREADS. Please, could you help me to solve the problem?

In addition, I added our gams code below. I am newly user for gams. So I don’t
know the gams code fully.

“Error Cannot open parameter file “C:\Users\VAHDİY-NTB\Documents\gamsdir
\projdir\cplex.opt”
*** Error Error code = 2; No such file or directory
Cplex MIP uses 1 of 4 parallel threads. Change default with option THREADS.”

MODEL model2 /all/;
model2.optfile=1;
$onecho > model2.opt
threads=0;
$offecho;
Option MIP = cplex;
Option reslim = 86400;
Solve model2 using MIP minimizing P;

Vahdi.

7

Hi, just drop the ‘;’ from the lines in the cplex.opt:

$onecho > model2.opt
threads=0
$offecho

The ‘;’ is important to separate GAMS language statements (see https://www.gams.com/latest/docs/UG_GAMSPrograms.html) The $xxx are dollar control options (https://www.gams.com/latest/docs/UG_DollarControlOptions.html) and not really part of the GAMS language. They are “compiler directives” and should not be terminated with ‘;’.

Hope this helps,
-Michael

8

Uhhh, and I forgot the obvious, create a ‘cplex.opt’ not a model2.opt as clearly instructed in https://www.gams.com/latest/docs/UG_SolverUsage.html#BASIC_USAGE_SOLVER_OPTION_FILE:

$onecho > cplex.opt
threads=0
$offecho

-Michael

9

Hello,

I revised my model because my problem also changed and I must to same variables, equations and etc.

If I change some changes in my m :imp: odel, I face to same problem which is " cplex MIP uses 1 of 4 parellel threads. Change default with option THREADS."

Now, I attached 2 version of our model. I use the same excel value, almost the same equations, but I can’t obtain the optimal solution for the revized version.

Could you help me how can solve this problem, plase.

Thank you

Vahdi
model1a_cost.xlsx (1.18 MB)
model1acost_190113.gms (17.2 KB)
model1acost_190113_revize.gms (17.7 KB)