[SCIP] Checkpoint and load of open nodes

[Jakob Witzig]

Hi Pang,

what do you mean exactly with "sometimes the process may be killed"?

In general, SCIP does not provide the possibility to restart from a 
saved state. The only exception is reoptimization but this feature has 
to be enable before solving the problem. Reoptimization automatically 
collects information like open and pruned nodes. However, this does not 
work if the solving process got killed. SCIP has to terminate in a 
proper state, e.g., if the gap limit has been reached.

Best,
Jakob

Am 11.07.19 um 11:04 schrieb 庞琳卓:
> Hi, I'm using SCIP to solve a sequence of problems,  sometimes the 
> process may be killed due to some reasons, all the information is 
> lost. So i want to save as much information as possible during the 
> solving process so that I can utilize the information in the process 
> of solving a new problem(only objective function changes) when the 
> process is killed.
>  I have tried to save all the feasible solutions so that i can add 
> them to the solution storage before solving a new problem, however, 
> since the problem is hard, i also want to save open nodes(or the 
> important nodes) and nodes with greater bounds than the global upper 
> bounds, and solve from these nodes in the next process.
> I know that I can have access to open nodes through SCIPgetsiblings() 
> & SCIPgetLeaves()& SCIPgetchildren(), I wonder that if i have saved 
> the open nodes, and launch a new process, how can i solve from the nodes?
> Thank you very much!
> Best wishes,
>
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> 	
> Pang
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-- 
Jakob Witzig

Zuse Institute Berlin (ZIB)

Division Mathematical Optimization and Scientific Information
Research Group Mathematical Optimization Methods

Takustrasse 7
14195 Berlin

Tel. : +49 (0)30 84185-416
Fax  : +49 (0)30 84185-269
email: witzig at zib.de

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