Originally posted by: Uonly

it seems not until cplex 12.2 , parallel with multiple threads is applied on root node.

What is the strategy cplex using?

try different lp methods on root node with different threads, got the fastest one and start from there to parallel tree search?

just curious how cplex parallel root node.
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: SystemAdmin

> Uonly wrote:
> it seems not until cplex 12.2 , parallel with multiple threads is applied on root node.
>
> What is the strategy cplex using?
>
That is actually a trade secret :-) Moreover, the strategy may change between versions without further notice. So this strategy is not documented and we will not make detailed comments on it.

> try different lp methods on root node with different threads, got the fastest one and start from there to parallel tree search?
>
This is known as "concurrent optimization". Concurrent optimization has been available in CPLEX for a long time but has been made deterministic only recently. Please refer to the user manual for further details about concurrent optimization.
Concurrent optimization is one of the things that CPLEX does at the root node if more than one thread is available.
#CPLEXOptimizers
#DecisionOptimization