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- // 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<jmethodID> 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<jclass> 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
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