Originally posted by: srinit34

cplex 12.6.1 had some documentation on when multiple threads can be used in presence of control callbacks

cannot find similar documentation in cplex 12.8

can you please point me to relevant documentation

I am not sure what you are referring to with respect to 12.6.

Control callbacks can always be used with mutli-threading, provided the implementation of callbacks is thread-safe.

Originally posted by: srinit34

If I remember, 12.6.1 had some guidelines and warnings about using multi threading in the presence of control callbacks.

For example it mentioned that as long as CPLEX api calls were used in the callbacks, multi threading was safe.

I could not find similar guidelines in 12.8.

Do you mean this? Or maybe this?

Originally posted by: srinit34

Thank you that was the page I was looking for.

On the desktop help, the topics are under Legacy Callbacks.

Thread safety and MIP control callbacks
Advanced MIP control interface (legacy)
 Using legacy optimization callbacks > Control callbacks
Control callbacks and parallel search