Avoid CPU overload when running MPI, which crazily increases test time

mpi/examples/Makefile.am

@@ -38,10 +38,10 @@ MPI			=	$(MPIEXEC) $(MPIEXEC_ARGS) -np 4
 endif
 
 if STARPU_HAVE_AM111
-TESTS_ENVIRONMENT	=	top_builddir="$(abs_top_builddir)" top_srcdir="$(abs_top_srcdir)"
+TESTS_ENVIRONMENT	=	STARPU_WORKERS_NOBIND=1 STARPU_NCPU=4 top_builddir="$(abs_top_builddir)" top_srcdir="$(abs_top_srcdir)"
 LOG_COMPILER	 	=	$(MPI) $(LOADER_BIN)
 else
-TESTS_ENVIRONMENT 	=	top_builddir="$(abs_top_builddir)" top_srcdir="$(abs_top_srcdir)" $(MPI) $(LOADER_BIN)
+TESTS_ENVIRONMENT 	=	STARPU_WORKERS_NOBIND=1 STARPU_NCPU=4 top_builddir="$(abs_top_builddir)" top_srcdir="$(abs_top_srcdir)" $(MPI) $(LOADER_BIN)
 endif
 
 if !STARPU_SIMGRID

mpi/tests/Makefile.am

@@ -35,10 +35,10 @@ MPI			=	$(MPIEXEC) $(MPIEXEC_ARGS) -np 4
 endif
 
 if STARPU_HAVE_AM111
-TESTS_ENVIRONMENT	=	top_builddir="$(abs_top_builddir)" top_srcdir="$(abs_top_srcdir)"
+TESTS_ENVIRONMENT	=	STARPU_WORKERS_NOBIND=1 STARPU_NCPU=4 top_builddir="$(abs_top_builddir)" top_srcdir="$(abs_top_srcdir)"
 LOG_COMPILER	 	=	$(MPI) $(LOADER_BIN)
 else
-TESTS_ENVIRONMENT 	=	top_builddir="$(abs_top_builddir)" top_srcdir="$(abs_top_srcdir)" $(MPI) $(LOADER_BIN)
+TESTS_ENVIRONMENT 	=	STARPU_WORKERS_NOBIND=1 STARPU_NCPU=4 top_builddir="$(abs_top_builddir)" top_srcdir="$(abs_top_srcdir)" $(MPI) $(LOADER_BIN)
 endif
 
 if !STARPU_SIMGRID

mpi/tests/ring.c

@@ -1,6 +1,6 @@
 /* StarPU --- Runtime system for heterogeneous multicore architectures.
  *
- * Copyright (C) 2009, 2010, 2014-2015  Université de Bordeaux
+ * Copyright (C) 2009, 2010, 2014-2016  Université de Bordeaux
  * Copyright (C) 2010, 2011, 2012, 2013, 2016  CNRS
  *
  * StarPU is free software; you can redistribute it and/or modify
@@ -20,6 +20,8 @@
 
 #ifdef STARPU_QUICK_CHECK
 #  define NITER	32
+#elif !defined(STARPU_LONG_CHECK)
+#  define NITER	256
 #else
 #  define NITER	2048
 #endif