Crank up the number of short receive blocks so that we're unlikely to hit the flow

control case.  Uses about same amount of memory as the Portals 3.3 implementations

This commit was SVN r24782.

ompi/mca/mtl/portals4/mtl_portals4_component.c

@@ -84,7 +84,7 @@ ompi_mtl_portals4_component_open(void)
                            "Number of short message receive blocks",
                            false,
                            false,
-                           8,
+                           32,
                            &ompi_mtl_portals4.recv_short_num);
 
     mca_base_param_reg_int(&mca_mtl_portals4_component.mtl_version,
@@ -92,7 +92,7 @@ ompi_mtl_portals4_component_open(void)
                            "Size of short message receive blocks",
                            false,
                            false,
-                           1024 * 1024,
+                           2 * 1024 * 1024,
                            &tmp);
     ompi_mtl_portals4.recv_short_size = tmp;