Add a control benchmark.
I'm thinking of using this in perf with something like:
ratio(fill(filter("test=foo")), fill(filter("test=control")))
Does that make sense to you?
Not sure that this is really a good control bench on all bots,
but I propose we just run it a bit and find out if it needs work.
BUG=skia:
Review URL: https://codereview.chromium.org/1129823003
diff --git a/bench/ControlBench.cpp b/bench/ControlBench.cpp
new file mode 100644
index 0000000..8c1177a
--- /dev/null
+++ b/bench/ControlBench.cpp
@@ -0,0 +1,26 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "Benchmark.h"
+
+// This benchmark's runtime should be fairly constant for a given machine,
+// so it can be used as a baseline to control for thermal or other throttling.
+
+struct ControlBench : public Benchmark {
+ const char* onGetName() override { return "control"; }
+ bool isSuitableFor(Backend backend) override { return backend == kNonRendering_Backend; }
+
+ void onDraw(const int loops, SkCanvas*) override {
+ // Nothing terribly useful: force a memory read, a memory write, and some math.
+ volatile uint32_t rand = 0;
+ for (int i = 0; i < 1000*loops; i++) {
+ rand *= 1664525;
+ rand += 1013904223;
+ }
+ }
+};
+DEF_BENCH(return new ControlBench;)