« Return to Thread: [AMPL 2595] cplex troubleshooting

[AMPL 2606] Re: cplex troubleshooting

by Guney Petek :: Rate this Message:

Thank you for your answer. I began to think that the problem may be
originating somewhere before CPLEX gets called. Using option gentimes
1; I get the error before the CPLEX welcome line:

<...>
## 159 0.42 16.79 27581144 ConstrB
## 161 0.71 17.5 38924672 ConstrC
## 163 2.62 20.12 112940576 ConstrD
## 165 9.38 29.5 341507112 ConstrE
## 167 36.13 65.63 18446744070417967104 ConstrF
Error executing "solve" command:
can't open /tmp/at8714.sol

For smaller instances, right after sequence #167 comes the CPLEX
welcome line "ILOG CPLEX 11.210, licensed to...".

I also tried: option gentimes 0; option times 1; But could not get
much info, either.

<...>
#output 1.13 0 5899101824
#Total 167.03
Error executing "solve" command:
can't open /tmp/at9179.sol
#execute 0.02 0 5899101824

How can I get maximum verbosity in AMPL?

Thanks, \\Guney

On Jun 14, 9:43 pm, "Robert Fourer" <4...@...> wrote:

> option cplex_options 'mipdisplay 2 mipinterval 100 ...';
>
> where ... is replaced by the other options that you are using (or is omitted
> if none). You can change 100 to some other value to regulate the amount of
> output.
>
> > -----Original Message-----
> > From: ampl@... [mailto:ampl@...]
> > On Behalf Of Guney Petek [gun...@...]
> > Sent: Sunday, June 14, 2009 2:13 PM
> > To: AMPL Modeling Language
> > Subject: [AMPL 2595] cplex troubleshooting
>
> > Greetings,
>
> > My model works for a number of instances except for a large instance(~
> > 400000 vars and 200000 cons) on which I am getting this error:
> > ---
> > Presolve eliminates 34074 constraints and 34074 variables.
> > ...
>
> > Error at _cmdno 71 executing "solve" command
> > (file model.run, line 62, offset 1585):
> > can't open model.sol
> > ---
>
> > I suspect that cplex is dying at some point. In order to trace the
> > problem I'd like to get more information from cplex along its
> > progress. What options can I use for troubleshooting cplex?
>
> > Thank you, \\Guney
>
>

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« Return to Thread: [AMPL 2595] cplex troubleshooting