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 2016-08-08 13:41:10.063547164 -0400 +++ src/sage/numerical/backends/coin_backend.pyx 2016-08-08 13:41:28.426547867 -0400 @@ -755,8 +755,8 @@ cdef class CoinBackend(GenericBackend): model.setLogLevel(old_logLevel) # multithreading - import multiprocessing - model.setNumberThreads(multiprocessing.cpu_count()) + #import multiprocessing + #model.setNumberThreads(multiprocessing.cpu_count()) model.branchAndBound()