[Scip] Question about the number of nodes processed

[Gregor Hendel]

Dear Alexander

yes, the number of nodes only shows you the size of the search tree 
during the last run of SCIP.
SCIP is triggered to perform restarts depending on the percentage of 
integer variables fixed during the root node.

You can, however, influence this behaviour from the interactive shell by 
changing parameter values:

      set presolving maxrestarts n

allows at most n restarts (0 disables restarting completely), while

     set presolving advanced

contains the four parameters immrestartfac, restartfac, restartminred, 
and subrestartfac, which all influence the restart policy of SCIP.

Best
Gregor

Am 03.07.2014 18:04, schrieb Alexander Schnell:
> Dear SCIP team,
>
> I have a question about the difference between the functions
> SCIPgetNNodes(...) and SCIPgetNTotalNodes(...) which give
> the total number of nodes processed in the current run and in all runs.
>
> What does a run mean or in which situations are the outputs of the above
> functions different?
> In concrete, is there a difference when the solution process is
> restarted more than once (i.e. does SCIPgetNNodes(...) only output the
> number of nodes processed after the last restart)?
>
> Best, Alex.
>
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