// Copyright (c) 2012 The Chromium 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 "base/android/jni_android.h" #include "base/at_exit.h" #include "base/logging.h" #include "base/time/time.h" #include "testing/gtest/include/gtest/gtest.h" namespace base { namespace android { namespace { std::atomic g_atomic_id(nullptr); int LazyMethodIDCall(JNIEnv* env, jclass clazz, int p) { jmethodID id = base::android::MethodID::LazyGet< base::android::MethodID::TYPE_STATIC>( env, clazz, "abs", "(I)I", &g_atomic_id); return env->CallStaticIntMethod(clazz, id, p); } int MethodIDCall(JNIEnv* env, jclass clazz, jmethodID id, int p) { return env->CallStaticIntMethod(clazz, id, p); } } // namespace TEST(JNIAndroidMicrobenchmark, MethodId) { JNIEnv* env = AttachCurrentThread(); ScopedJavaLocalRef clazz(GetClass(env, "java/lang/Math")); base::Time start_lazy = base::Time::Now(); int o = 0; for (int i = 0; i < 1024; ++i) o += LazyMethodIDCall(env, clazz.obj(), i); base::Time end_lazy = base::Time::Now(); jmethodID id = g_atomic_id; base::Time start = base::Time::Now(); for (int i = 0; i < 1024; ++i) o += MethodIDCall(env, clazz.obj(), id, i); base::Time end = base::Time::Now(); // On a Galaxy Nexus, results were in the range of: // JNI LazyMethodIDCall (us) 1984 // JNI MethodIDCall (us) 1861 LOG(ERROR) << "JNI LazyMethodIDCall (us) " << base::TimeDelta(end_lazy - start_lazy).InMicroseconds(); LOG(ERROR) << "JNI MethodIDCall (us) " << base::TimeDelta(end - start).InMicroseconds(); LOG(ERROR) << "JNI " << o; } } // namespace android } // namespace base