Import benchmark-tools to main repository.

This has adapted for use with bazel from the original commit
a26e93769ebefd82593a43e22fb13a09717cfa6d.

In particular, the style has been made consistent with internal python style
guidelines, and the packages (including the main entrypoint) have been
refactored in order to allow bazel testing targets.

PiperOrigin-RevId: 283484433

1 files changed, 57 insertions, 0 deletions

diff --git a/benchmarks/suites/helpers.py b/benchmarks/suites/helpers.py
new file mode 100644
index 000000000..b3c7360ab
--- /dev/null
+++ b/benchmarks/suites/helpers.py
@@ -0,0 +1,57 @@
+# python3
+# Copyright 2019 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Benchmark helpers."""
+
+import datetime
+from benchmarks.harness import machine
+
+
+class Timer:
+  """Helper to time runtime of some call.
+
+  Usage:
+
+    with Timer as t:
+        # do something.
+        t.get_time_in_seconds()
+  """
+
+  def __init__(self):
+    self._start = datetime.datetime.now()
+
+  def __enter__(self):
+    self.start()
+    return self
+
+  def start(self):
+    """Starts the timer."""
+    self._start = datetime.datetime.now()
+
+  def elapsed(self) -> float:
+    """Returns the elapsed time in seconds."""
+    return (datetime.datetime.now() - self._start).total_seconds()
+
+  def __exit__(self, exception_type, exception_value, exception_traceback):
+    pass
+
+
+def drop_caches(target: machine.Machine):
+  """Drops caches on the machine.
+
+  Args:
+    target: A machine object.
+  """
+  target.run("sudo sync")
+  target.run("sudo sysctl vm.drop_caches=3")
+  target.run("sudo sysctl vm.drop_caches=3")