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62 lines
1.7 KiB
62 lines
1.7 KiB
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/android/jni_android.h"
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#include "base/at_exit.h"
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#include "base/logging.h"
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#include "testing/gtest/include/gtest/gtest.h"
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namespace base {
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namespace android {
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namespace {
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base::subtle::AtomicWord g_atomic_id = 0;
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int LazyMethodIDCall(JNIEnv* env, jclass clazz, int p) {
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jmethodID id = base::android::MethodID::LazyGet<
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base::android::MethodID::TYPE_STATIC>(
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env, clazz,
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"abs",
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"(I)I",
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&g_atomic_id);
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return env->CallStaticIntMethod(clazz, id, p);
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}
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int MethodIDCall(JNIEnv* env, jclass clazz, jmethodID id, int p) {
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return env->CallStaticIntMethod(clazz, id, p);
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}
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} // namespace
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TEST(JNIAndroidMicrobenchmark, MethodId) {
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JNIEnv* env = AttachCurrentThread();
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ScopedJavaLocalRef<jclass> clazz(GetClass(env, "java/lang/Math"));
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base::Time start_lazy = base::Time::Now();
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int o = 0;
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for (int i = 0; i < 1024; ++i)
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o += LazyMethodIDCall(env, clazz.obj(), i);
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base::Time end_lazy = base::Time::Now();
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jmethodID id = reinterpret_cast<jmethodID>(g_atomic_id);
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base::Time start = base::Time::Now();
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for (int i = 0; i < 1024; ++i)
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o += MethodIDCall(env, clazz.obj(), id, i);
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base::Time end = base::Time::Now();
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// On a Galaxy Nexus, results were in the range of:
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// JNI LazyMethodIDCall (us) 1984
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// JNI MethodIDCall (us) 1861
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LOG(ERROR) << "JNI LazyMethodIDCall (us) " <<
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base::TimeDelta(end_lazy - start_lazy).InMicroseconds();
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LOG(ERROR) << "JNI MethodIDCall (us) " <<
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base::TimeDelta(end - start).InMicroseconds();
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LOG(ERROR) << "JNI " << o;
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}
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} // namespace android
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} // namespace base
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