[SCIP] concurrentopt and warm starts

Purple Break purple.break at gmail.com
Fri Feb 1 15:25:59 CET 2019


Hi,
I am using SCIP 6.0.1 on Linux.
is it possible to make use of warm starts when using concurrentopt?

Using the interactive optimizer it seems to accept the solution but then
ignores it during solving:

read problem <x.lp>

primal solution from solution file <x.sol> was accepted as candidate,
will be checked when solving starts

SCIP> concurrentopt
1/1 feasible solution given by solution candidate storage, new primal bound
2.288640e+06

starting solve in concurrent solver 'scip-7'
starting solve in concurrent solver 'scip-4'
starting solve in concurrent solver 'scip-6'
starting solve in concurrent solver 'scip-8'
starting solve in concurrent solver 'scip-3'
starting solve in concurrent solver 'scip-5'
starting solve in concurrent solver 'scip-2'
starting solve in concurrent solver 'scip-1'
 time | mem |  dualbound   | primalbound  |  gap
$11.3s|3829M|      --      | 6.127008e+06 |    Inf
 12.5s|3878M|      --      | 6.127008e+06 |    Inf
 17.6s|4251M|      --      | 6.127008e+06 |    Inf
 20.6s|4433M|      --      | 6.127008e+06 |    Inf
 29.8s|4791M|      --      | 6.127008e+06 |    Inf
 30.1s|4814M|      --      | 6.127008e+06 |    Inf
$1164s|6801M| 1.428576e+06 | 2.745312e+06 |  92.17%

As you can see: the 8 solvers are not using the primal bound 2.288640e+06

Thanks,
Peter
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