From ce9ec0c0a1e21dcf4d0cb5f2cdf3e95456a5f3c1 Mon Sep 17 00:00:00 2001
From: Bertrand Bordage <bordage.bertrand@gmail.com>
Date: Sun, 4 Jun 2017 18:38:13 +0200
Subject: [PATCH] Clears caches during benchmark to ensure the same conditions
 for each test.

---
 benchmark.py       | 4 ++++
 docs/benchmark.rst | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/benchmark.py b/benchmark.py
index fe14194..e157672 100755
--- a/benchmark.py
+++ b/benchmark.py
@@ -161,6 +161,10 @@ class Benchmark(object):
                  'cache': self.cache_name})
 
     def benchmark(self, query_str, to_list=True, num_queries=1):
+        # Clears the cache before a single benchmark to ensure the same
+        # conditions across single benchmarks.
+        caches[settings.CACHALOT_CACHE].clear()
+
         self.query_name = query_str
         query_str = 'Test.objects.using(using)' + query_str
         if to_list:
diff --git a/docs/benchmark.rst b/docs/benchmark.rst
index 5e77f80..ac0597b 100644
--- a/docs/benchmark.rst
+++ b/docs/benchmark.rst
@@ -23,6 +23,10 @@ Conditions
 
 .. include:: ../benchmark/conditions.rst
 
+Note that
+`MySQL’s query cache <http://dev.mysql.com/doc/refman/5.7/en/query-cache.html>`_
+is active during the benchmark.
+
 Database results
 ................