diff mbox series

[5/7] simplebench: bench_one(): support count=1

Message ID 20210129165030.640169-6-vsementsov@virtuozzo.com
State New
Headers show
Series qcow2: compressed write cache | expand

Commit Message

Vladimir Sementsov-Ogievskiy Jan. 29, 2021, 4:50 p.m. UTC 
statistics.stdev raises if sequence length is less than two. Support
that case by hand.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
 scripts/simplebench/simplebench.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/scripts/simplebench/simplebench.py b/scripts/simplebench/simplebench.py
index 78d90faf4d..407e95cec3 100644
--- a/scripts/simplebench/simplebench.py
+++ b/scripts/simplebench/simplebench.py
@@ -92,7 +92,10 @@  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)