Provide configure parameter to allow the disabling of reading parameters

and components from the home directory for platforms that are bad at
reading in files from home directory at scale (like Red Storm)

This commit was SVN r20069.

config/ompi_configure_options.m4

@@ -639,6 +639,20 @@ AM_CONDITIONAL([OMPI_WANT_SCRIPT_WRAPPER_COMPILERS],
     [test "$enable_script_wrapper_compilers" = "yes"])
 AC_CONFIG_FILES([ompi/tools/wrappers/ompi_wrapper_script], [chmod +x ompi/tools/wrappers/ompi_wrapper_script])
 
+#
+# Support per-user config files?
+#
+AC_ARG_ENABLE([per-user-config-files],
+   [AC_HELP_STRING([--enable-per-user-config-files],
+      [Disable per-user configuration files, to save disk accesses during job strart-up.  This is likely desirable for large jobs.  Note that this can also be acheived by environment variables at run-time.  (default: enabled)])])
+if test "$enable_per_user_config_files" = "no" ; then
+  result=0
+else
+  result=1
+fi
+AC_DEFINE_UNQUOTED([OMPI_WANT_HOME_CONFIG_FILES], [$result],
+     [Enable per-user config files])
+
 #
 # Do we want to disable IPv6 support?
 #
@@ -709,4 +723,5 @@ AC_DEFINE_UNQUOTED([OPAL_IDENT_STRING], ["$with_ident_string"],
      [ident string for Open MPI])
 AC_MSG_RESULT([$with_ident_string])
 
+
 ])

opal/mca/base/mca_base_open.c

@@ -66,7 +66,11 @@ int mca_base_open(void)
   }
 
   /* Register some params */
+#if OMPI_WANT_HOME_CONFIG_FILES
   asprintf(&value, "%s%c%s"OPAL_PATH_SEP".openmpi"OPAL_PATH_SEP"components", opal_install_dirs.pkglibdir, OPAL_ENV_SEP, opal_home_directory() );
+#else
+  asprintf(&value, "%s", opal_install_dirs.pkglibdir); 
+#endif
 
   mca_base_param_component_path = 
     mca_base_param_reg_string_name("mca", "component_path",

opal/mca/base/mca_base_param.c

@@ -193,9 +193,15 @@ int mca_base_param_recache_files(bool rel_path_search)
         }
     }
 
+#if OMPI_WANT_HOME_CONFIG_FILES
     asprintf(&files,
              "%s"OPAL_PATH_SEP".openmpi"OPAL_PATH_SEP"mca-params.conf%c%s"OPAL_PATH_SEP"openmpi-mca-params.conf",
              home, OPAL_ENV_SEP, opal_install_dirs.sysconfdir);
+#else
+    asprintf(&files,
+             "%s"OPAL_PATH_SEP"openmpi-mca-params.conf",
+             opal_install_dirs.sysconfdir);
+#endif
 
     /* Initialize a parameter that says where MCA param files can
        be found */