AU: Speed up full update payload generation by running multiple threads.

full_update_generator_unittest.cc

Index: full_update_generator_unittest.cc
diff --git a/full_update_generator_unittest.cc b/full_update_generator_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..16aa5686fa45fde949252df106b6504f5dd37c19
--- /dev/null
+++ b/full_update_generator_unittest.cc
@@ -0,0 +1,91 @@
+// Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <string>
+#include <vector>
+
+#include <gtest/gtest.h>
+
+#include "update_engine/full_update_generator.h"
+#include "update_engine/test_utils.h"
+
+using std::string;
+using std::vector;
+
+namespace chromeos_update_engine {
+
+namespace {
+  const size_t kBlockSize = 4096;
+}  // namespace {}
+
+
+class FullUpdateGeneratorTest : public ::testing::Test { };
+
+
+TEST(FullUpdateGeneratorTest, RunTest) {
+  vector<char> new_root(20 * 1024 * 1024);
+  vector<char> new_kern(16 * 1024 * 1024);
+  const off_t kChunkSize = 128 * 1024;
+  FillWithData(&new_root);
+  FillWithData(&new_kern);
+  // Assume hashes take 2 MiB beyond the rootfs.
+  off_t new_rootfs_size = new_root.size() - 2 * 1024 * 1024;
+
+  string new_root_path;
+  EXPECT_TRUE(utils::MakeTempFile("/tmp/NewFullUpdateTest_R.XXXXXX",
+                                  &new_root_path,
+                                  NULL));
+  ScopedPathUnlinker new_root_path_unlinker(new_root_path);
+  EXPECT_TRUE(WriteFileVector(new_root_path, new_root));
+
+  string new_kern_path;
+  EXPECT_TRUE(utils::MakeTempFile("/tmp/NewFullUpdateTest_K.XXXXXX",
+                                  &new_kern_path,
+                                  NULL));
+  ScopedPathUnlinker new_kern_path_unlinker(new_kern_path);
+  EXPECT_TRUE(WriteFileVector(new_kern_path, new_kern));
+
+  string out_blobs_path;
+  int out_blobs_fd;
+  EXPECT_TRUE(utils::MakeTempFile("/tmp/NewFullUpdateTest_D.XXXXXX",
+                                  &out_blobs_path,
+                                  &out_blobs_fd));
+  ScopedPathUnlinker out_blobs_path_unlinker(out_blobs_path);
+  ScopedFdCloser out_blobs_fd_closer(&out_blobs_fd);
+
+  off_t out_blobs_length = 0;
+
+  Graph graph;
+  vector<DeltaArchiveManifest_InstallOperation> kernel_ops;
+  vector<Vertex::Index> final_order;
+
+  EXPECT_TRUE(FullUpdateGenerator::Run(&graph,
+                                       new_kern_path,
+                                       new_root_path,
+                                       new_rootfs_size,
+                                       out_blobs_fd,
+                                       &out_blobs_length,
+                                       kChunkSize,
+                                       kBlockSize,
+                                       &kernel_ops,
+                                       &final_order));
+  EXPECT_EQ(new_rootfs_size / kChunkSize, graph.size());
+  EXPECT_EQ(new_rootfs_size / kChunkSize, final_order.size());
+  EXPECT_EQ(new_kern.size() / kChunkSize, kernel_ops.size());
+  for (off_t i = 0; i < (new_rootfs_size / kChunkSize); ++i) {
+    EXPECT_EQ(i, final_order[i]);
+    EXPECT_EQ(1, graph[i].op.dst_extents_size());
+    EXPECT_EQ(i * kChunkSize / kBlockSize,
+              graph[i].op.dst_extents(0).start_block()) << "i = " << i;
+    EXPECT_EQ(kChunkSize / kBlockSize,
+              graph[i].op.dst_extents(0).num_blocks());
+    if (graph[i].op.type() !=
+        DeltaArchiveManifest_InstallOperation_Type_REPLACE) {
+      EXPECT_EQ(DeltaArchiveManifest_InstallOperation_Type_REPLACE_BZ,
+                graph[i].op.type());
+    }
+  }
+}
+
+}  // namespace chromeos_update_engine