From 993803ed2a22c24b45d09f750e4527a05c7900c0 Mon Sep 17 00:00:00 2001
From: Nico Weber <nicolasweber@gmx.de>
Date: Wed, 16 Apr 2014 21:56:49 -0700
Subject: Add a simple manifest parsing perftest.

---
 configure.py                    |  9 +++--
 src/manifest_parser_perftest.cc | 82 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 88 insertions(+), 3 deletions(-)
 create mode 100644 src/manifest_parser_perftest.cc

diff --git a/configure.py b/configure.py
index 50a4176..c5a6abd 100755
--- a/configure.py
+++ b/configure.py
@@ -377,18 +377,21 @@ all_targets += ninja_test
 
 
 n.comment('Ancillary executables.')
-objs = cxx('depfile_parser_perftest')
-all_targets += n.build(binary('depfile_parser_perftest'), 'link', objs,
-                       implicit=ninja_lib, variables=[('libs', libs)])
 objs = cxx('build_log_perftest')
 all_targets += n.build(binary('build_log_perftest'), 'link', objs,
                        implicit=ninja_lib, variables=[('libs', libs)])
 objs = cxx('canon_perftest')
 all_targets += n.build(binary('canon_perftest'), 'link', objs,
                        implicit=ninja_lib, variables=[('libs', libs)])
+objs = cxx('depfile_parser_perftest')
+all_targets += n.build(binary('depfile_parser_perftest'), 'link', objs,
+                       implicit=ninja_lib, variables=[('libs', libs)])
 objs = cxx('hash_collision_bench')
 all_targets += n.build(binary('hash_collision_bench'), 'link', objs,
                               implicit=ninja_lib, variables=[('libs', libs)])
+objs = cxx('manifest_parser_perftest')
+all_targets += n.build(binary('manifest_parser_perftest'), 'link', objs,
+                              implicit=ninja_lib, variables=[('libs', libs)])
 n.newline()
 
 n.comment('Generate a graph using the "graph" tool.')
diff --git a/src/manifest_parser_perftest.cc b/src/manifest_parser_perftest.cc
new file mode 100644
index 0000000..208d3a3
--- /dev/null
+++ b/src/manifest_parser_perftest.cc
@@ -0,0 +1,82 @@
+// Copyright 2014 Google Inc. All Rights Reserved.
+//
+// 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.
+
+// Tests manifest parser performance.  Expects to be run in ninja's root
+// directory.
+
+#include <numeric>
+
+#ifdef _WIN32
+#include <direct.h>
+#else
+#include <unistd.h>
+#endif
+
+#include "disk_interface.h"
+#include "manifest_parser.h"
+#include "metrics.h"
+#include "state.h"
+#include "util.h"
+
+struct RealFileReader : public ManifestParser::FileReader {
+  virtual bool ReadFile(const string& path, string* content, string* err) {
+    return ::ReadFile(path, content, err) == 0;
+  }
+};
+
+bool WriteFakeManifests(const string& dir) {
+  RealDiskInterface disk_interface;
+  if (disk_interface.Stat(dir + "/build.ninja") > 0)
+    return true;
+
+  printf("Creating manifest data..."); fflush(stdout);
+  int err = system(("python misc/write_fake_manifests.py " + dir).c_str());
+  printf("done.\n");
+  return err == 0;
+}
+
+int main() {
+  const char kManifestDir[] = "build/manifest_perftest";
+  RealFileReader file_reader;
+  vector<int> times;
+  string err;
+
+  if (!WriteFakeManifests(kManifestDir)) {
+    fprintf(stderr, "Failed to write test data\n");
+    return 1;
+  }
+
+  chdir(kManifestDir);
+
+  const int kNumRepetitions = 5;
+  for (int i = 0; i < kNumRepetitions; ++i) {
+    int64_t start = GetTimeMillis();
+
+    State state;
+    ManifestParser parser(&state, &file_reader);
+    if (!parser.Load("build.ninja", &err)) {
+      fprintf(stderr, "Failed to read test data: %s\n", err.c_str());
+      return 1;
+    }
+
+    int delta = (int)(GetTimeMillis() - start);
+    printf("%dms\n", delta);
+    times.push_back(delta);
+  }
+
+  int min = *min_element(times.begin(), times.end());
+  int max = *max_element(times.begin(), times.end());
+  float total = accumulate(times.begin(), times.end(), 0);
+  printf("min %dms  max %dms  avg %.1fms\n", min, max, total / times.size());
+}
-- 
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