diff -up src/sage/numerical/backends/coin_backend.pyx.orig src/sage/numerical/backends/coin_backend.pyx --- src/sage/numerical/backends/coin_backend.pyx.orig 2018-05-16 13:40:23.571130540 -0600 +++ src/sage/numerical/backends/coin_backend.pyx 2018-05-16 13:41:06.750534427 -0600 @@ -762,8 +762,8 @@ cdef class CoinBackend(GenericBackend): model.setLogLevel(old_logLevel) # multithreading - import multiprocessing - model.setNumberThreads(ncpus()) + #import multiprocessing + #model.setNumberThreads(ncpus()) model.branchAndBound()