simplebench: bench_one(): support count=1

statistics.stdev raises if sequence length is less than two. Support
that case by hand.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: John Snow <jsnow@redhat.com>

diff --git a/scripts/simplebench/simplebench.py b/scripts/simplebench/simplebench.py
index 0a3035732c4a2631160d64f99c6c5b2bd4ca15b2..27bc4d47153d7ba06fa8ce4d1c75867b222f8f94 100644 (file)
--- a/scripts/simplebench/simplebench.py
+++ b/scripts/simplebench/simplebench.py
@@ -83,7 +83,10 @@ def bench_one(test_func, test_env, test_case, count=5, initial_run=True,
             dim = 'seconds'
         result['dimension'] = dim
         result['average'] = statistics.mean(r[dim] for r in succeeded)
-        result['stdev'] = statistics.stdev(r[dim] for r in succeeded)
+        if len(succeeded) == 1:
+            result['stdev'] = 0
+        else:
+            result['stdev'] = statistics.stdev(r[dim] for r in succeeded)
 
     if len(succeeded) < count:
         result['n-failed'] = count - len(succeeded)