Slight change to the defaults -- make the prefix "output-pid<pid>-" so

that multiple processes don't overwrite each other.  Change that
default in orte_init_stage1() to just "output-" (because the file will
be in a process-unique directory at that point; the pid is no longer
necessary).

This commit was SVN r7256.

opal/util/output.c

@@ -137,7 +137,7 @@ bool opal_output_init(void)
 
     /* Set some defaults */
 
-    output_prefix = strdup("output-");
+    asprintf(&output_prefix, "output-pid%d-", getpid());
     if (NULL != (str = getenv("TMPDIR"))) {
         output_dir = strdup(str);
     } else if (NULL != (str = getenv("HOME"))) {

opal/util/output.h

@@ -404,12 +404,13 @@ struct opal_output_stream_t {
      * The default value for the output directory is whatever is
      * specified in the TMPDIR environment variable if it exists, or
      * $HOME if it does not.  The default value for the prefix is
-     * "output-".
+     * "output-pid<pid>-" (where "<pid>" is replaced by the PID of the
+     * current process).
      *
      * If dir or prefix are NULL, new values are not set.  The strings
      * represented by dir and prefix are copied into internal storage;
-     * it is safe to free() these values after
-     * opal_output_set_output_file_info() returns.
+     * it is safe to pass string constants or free() these values
+     * after opal_output_set_output_file_info() returns.
      *
      * If olddir or oldprefix are not NULL, copies of the old
      * directory and prefix (respectively) are returned in these

orte/runtime/orte_init_stage1.c

@@ -282,8 +282,8 @@ int orte_init_stage1(bool infrastructure)
     /* Once the session directory location has been established, set
        the opal_output default file location to be in the
        proc-specific session directory. */
-    opal_output_set_output_file_info(orte_process_info.proc_session_dir, NULL,
-                                     NULL, NULL);
+    opal_output_set_output_file_info(orte_process_info.proc_session_dir, 
+                                     "output-", NULL, NULL);
 
     /* if i'm the seed, get my contact info and write my setup file for others to find */
     if (orte_process_info.seed) {