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-rw-r--r--yardstick/benchmark/runners/base.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/yardstick/benchmark/runners/base.py b/yardstick/benchmark/runners/base.py
index badc33565..30fa07639 100644
--- a/yardstick/benchmark/runners/base.py
+++ b/yardstick/benchmark/runners/base.py
@@ -25,7 +25,7 @@ def _output_serializer_main(filename, queue):
Use of this process enables multiple instances of a scenario without
messing up the output file.
'''
- with open(filename, 'w') as outfile:
+ with open(filename, 'a+') as outfile:
while True:
# blocks until data becomes available
record = queue.get()