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__lll_lock_wait allowing only one thread to work
I am calling the XPRESS optimizer from a multithreaded Pascal application and having performance issues with the solver. While the program is multithreaded, all but one of the threads are sleeping a...
It is hard to tell what exactly is happening here. Could you provide more details about your code or maybe a code sample? I would have to try to reproduce the behavior here to see where and why the probs are still acquiring global locks.
Just to be sure: in each of the threads you explicitly set the XPRS_THREADS control to 1? Otherwise you may end up with a multi-threaded solve in each thread and that may result in quite some oversubscription of your CPUs.