ovs-benchmark: improve 'rate' command piped output support.

Add fflush() to the 'rate' command of 'ovs-benchmark'. On a tty console the output is line-buffered. However, piped output by default has a deeper (usually 4KB) buffer, the output won't appear to the other end of the pipe until this buffer is full. This patch makes the piped output of the 'rate' command's consistent with tty console output. Signed-off-by: Andy Zhou <[email protected]> Signed-off-by: Ben Pfaff <[email protected]>
noreirik · May 2, 2013 · d515594 · d515594
1 parent 3cbb5dc
commit d515594
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/utilities/ovs-benchmark.c b/utilities/ovs-benchmark.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2010, 2011, 2012 Nicira, Inc.
+ * Copyright (c) 2010, 2011, 2012, 2013 Nicira, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -472,6 +472,7 @@ cmd_rate(int argc OVS_UNUSED, char *argv[] OVS_UNUSED)
             printf("%.3f s elapsed, %u OK, %u failed, avg %.1f/s\n",
                    elapsed / 1000.0, completed - failures, failures,
                    completed / (elapsed / 1000.0));
+            fflush(stdout);
             prev = now;
 
             if (timeout && elapsed > timeout * 1000LL) {