[SCIP] small gaps

[Gerald Gamrath]

Dear Marcus,

which SCIP version are you using?

There is probably some branching and cuts going on, but SCIP does not 
print information for every node. But it seems indeed very slow here. If 
you interrupt using CTRL-C or set a time limit of say, one hour, and 
then print the statistics via "display statistics" you should be able to 
identify where all the time is spent. Alternatively, you could also "set 
display frequency 1" to print a line for every node. But in the end, the 
statistics should be most interesting.

Best,
Gerald

On 27.01.20 18:59, Marcus Daniels wrote:
> Hi,
>
> I have a set of relaxed problems that find feasibility, run for a few 
> seconds, and then get stuck as below.   There's no further branching 
> and no further cuts, not even after an hour. Depending on the problem 
> the gap might be 0.01% or 0.80%.   Any suggestions on how to debug 
> this or tune it to get to a zero gap?  I tried doing less frequent LP 
> solves, but that also runs forever.
>
> Thanks,
>
> Marcus
>
>  time | node  | left  |LP iter|LP it/n| mem |mdpt |frac |vars |cons 
> |cols |rows |cuts |confs|strbr|  dualbound   | primalbound  |  gap
>  97.1s|     1 |     0 |  1247 |     - | 156M|   0 |   2 |5502 |3048 
> |5502 |3067 |  20 |   0 |   0 | 1.524548e-02 | 1.528577e-02 |   0.26%
>  97.1s| 1 |     2 |  1247 |     - | 157M|   0 |   2 |5502 |3048 |5502 
> |3067 |  20 |   0 |   2 | 1.524548e-02 | 1.528577e-02 |   0.26%
>
>
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