configure.ac: increase default value for STARPU_MAXCPUS to 64

configure.ac

@@ -193,7 +193,7 @@ fi
 AC_MSG_CHECKING(maximum number of CPUs)
 AC_ARG_ENABLE(maxcpus, [AS_HELP_STRING([--enable-maxcpus=<number>],
 			[maximum number of CPUs])],
-			maxcpus=$enableval, maxcpus=16)
+			maxcpus=$enableval, maxcpus=64)
 AC_MSG_RESULT($maxcpus)
 AC_DEFINE_UNQUOTED(STARPU_MAXCPUS, [$maxcpus], [Maximum number of CPUs supported])