f20d6788e7
BUG=v8:5000 Review-Url: https://codereview.chromium.org/2106243002 Cr-Commit-Position: refs/heads/master@{#37454}
262 lines
9.0 KiB
C++
262 lines
9.0 KiB
C++
// Copyright 2014 the V8 project 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 "src/base/platform/time.h"
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#if V8_OS_MACOSX
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#include <mach/mach_time.h>
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#endif
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#if V8_OS_POSIX
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#include <sys/time.h>
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#endif
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#if V8_OS_WIN
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#include "src/base/win32-headers.h"
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#endif
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#include <vector>
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#include "src/base/platform/elapsed-timer.h"
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#include "src/base/platform/platform.h"
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#include "testing/gtest/include/gtest/gtest.h"
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namespace v8 {
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namespace base {
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TEST(TimeDelta, FromAndIn) {
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EXPECT_EQ(TimeDelta::FromDays(2), TimeDelta::FromHours(48));
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EXPECT_EQ(TimeDelta::FromHours(3), TimeDelta::FromMinutes(180));
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EXPECT_EQ(TimeDelta::FromMinutes(2), TimeDelta::FromSeconds(120));
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EXPECT_EQ(TimeDelta::FromSeconds(2), TimeDelta::FromMilliseconds(2000));
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EXPECT_EQ(TimeDelta::FromMilliseconds(2), TimeDelta::FromMicroseconds(2000));
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EXPECT_EQ(static_cast<int>(13), TimeDelta::FromDays(13).InDays());
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EXPECT_EQ(static_cast<int>(13), TimeDelta::FromHours(13).InHours());
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EXPECT_EQ(static_cast<int>(13), TimeDelta::FromMinutes(13).InMinutes());
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EXPECT_EQ(static_cast<int64_t>(13), TimeDelta::FromSeconds(13).InSeconds());
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EXPECT_DOUBLE_EQ(13.0, TimeDelta::FromSeconds(13).InSecondsF());
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EXPECT_EQ(static_cast<int64_t>(13),
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TimeDelta::FromMilliseconds(13).InMilliseconds());
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EXPECT_DOUBLE_EQ(13.0, TimeDelta::FromMilliseconds(13).InMillisecondsF());
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EXPECT_EQ(static_cast<int64_t>(13),
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TimeDelta::FromMicroseconds(13).InMicroseconds());
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}
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#if V8_OS_MACOSX
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TEST(TimeDelta, MachTimespec) {
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TimeDelta null = TimeDelta();
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EXPECT_EQ(null, TimeDelta::FromMachTimespec(null.ToMachTimespec()));
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TimeDelta delta1 = TimeDelta::FromMilliseconds(42);
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EXPECT_EQ(delta1, TimeDelta::FromMachTimespec(delta1.ToMachTimespec()));
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TimeDelta delta2 = TimeDelta::FromDays(42);
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EXPECT_EQ(delta2, TimeDelta::FromMachTimespec(delta2.ToMachTimespec()));
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}
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#endif
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TEST(Time, JsTime) {
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Time t = Time::FromJsTime(700000.3);
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EXPECT_DOUBLE_EQ(700000.3, t.ToJsTime());
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}
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#if V8_OS_POSIX
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TEST(Time, Timespec) {
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Time null;
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EXPECT_TRUE(null.IsNull());
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EXPECT_EQ(null, Time::FromTimespec(null.ToTimespec()));
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Time now = Time::Now();
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EXPECT_EQ(now, Time::FromTimespec(now.ToTimespec()));
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Time now_sys = Time::NowFromSystemTime();
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EXPECT_EQ(now_sys, Time::FromTimespec(now_sys.ToTimespec()));
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Time unix_epoch = Time::UnixEpoch();
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EXPECT_EQ(unix_epoch, Time::FromTimespec(unix_epoch.ToTimespec()));
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Time max = Time::Max();
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EXPECT_TRUE(max.IsMax());
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EXPECT_EQ(max, Time::FromTimespec(max.ToTimespec()));
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}
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TEST(Time, Timeval) {
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Time null;
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EXPECT_TRUE(null.IsNull());
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EXPECT_EQ(null, Time::FromTimeval(null.ToTimeval()));
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Time now = Time::Now();
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EXPECT_EQ(now, Time::FromTimeval(now.ToTimeval()));
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Time now_sys = Time::NowFromSystemTime();
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EXPECT_EQ(now_sys, Time::FromTimeval(now_sys.ToTimeval()));
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Time unix_epoch = Time::UnixEpoch();
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EXPECT_EQ(unix_epoch, Time::FromTimeval(unix_epoch.ToTimeval()));
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Time max = Time::Max();
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EXPECT_TRUE(max.IsMax());
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EXPECT_EQ(max, Time::FromTimeval(max.ToTimeval()));
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}
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#endif
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#if V8_OS_WIN
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TEST(Time, Filetime) {
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Time null;
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EXPECT_TRUE(null.IsNull());
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EXPECT_EQ(null, Time::FromFiletime(null.ToFiletime()));
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Time now = Time::Now();
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EXPECT_EQ(now, Time::FromFiletime(now.ToFiletime()));
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Time now_sys = Time::NowFromSystemTime();
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EXPECT_EQ(now_sys, Time::FromFiletime(now_sys.ToFiletime()));
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Time unix_epoch = Time::UnixEpoch();
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EXPECT_EQ(unix_epoch, Time::FromFiletime(unix_epoch.ToFiletime()));
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Time max = Time::Max();
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EXPECT_TRUE(max.IsMax());
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EXPECT_EQ(max, Time::FromFiletime(max.ToFiletime()));
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}
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#endif
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namespace {
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template <typename T>
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static void ResolutionTest(T (*Now)(), TimeDelta target_granularity) {
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// We're trying to measure that intervals increment in a VERY small amount
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// of time -- according to the specified target granularity. Unfortunately,
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// if we happen to have a context switch in the middle of our test, the
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// context switch could easily exceed our limit. So, we iterate on this
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// several times. As long as we're able to detect the fine-granularity
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// timers at least once, then the test has succeeded.
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static const TimeDelta kExpirationTimeout = TimeDelta::FromSeconds(1);
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ElapsedTimer timer;
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timer.Start();
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TimeDelta delta;
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do {
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T start = Now();
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T now = start;
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// Loop until we can detect that the clock has changed. Non-HighRes timers
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// will increment in chunks, i.e. 15ms. By spinning until we see a clock
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// change, we detect the minimum time between measurements.
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do {
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now = Now();
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delta = now - start;
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} while (now <= start);
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EXPECT_NE(static_cast<int64_t>(0), delta.InMicroseconds());
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} while (delta > target_granularity && !timer.HasExpired(kExpirationTimeout));
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EXPECT_LE(delta, target_granularity);
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}
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} // namespace
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TEST(Time, NowResolution) {
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// We assume that Time::Now() has at least 16ms resolution.
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static const TimeDelta kTargetGranularity = TimeDelta::FromMilliseconds(16);
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ResolutionTest<Time>(&Time::Now, kTargetGranularity);
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}
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TEST(TimeTicks, NowResolution) {
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// We assume that TimeTicks::Now() has at least 16ms resolution.
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static const TimeDelta kTargetGranularity = TimeDelta::FromMilliseconds(16);
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ResolutionTest<TimeTicks>(&TimeTicks::Now, kTargetGranularity);
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}
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TEST(TimeTicks, HighResolutionNowResolution) {
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if (!TimeTicks::IsHighResolutionClockWorking()) return;
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// We assume that TimeTicks::HighResolutionNow() has sub-ms resolution.
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static const TimeDelta kTargetGranularity = TimeDelta::FromMilliseconds(1);
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ResolutionTest<TimeTicks>(&TimeTicks::HighResolutionNow, kTargetGranularity);
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}
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TEST(TimeTicks, IsMonotonic) {
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TimeTicks previous_normal_ticks;
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TimeTicks previous_highres_ticks;
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ElapsedTimer timer;
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timer.Start();
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while (!timer.HasExpired(TimeDelta::FromMilliseconds(100))) {
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TimeTicks normal_ticks = TimeTicks::Now();
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TimeTicks highres_ticks = TimeTicks::HighResolutionNow();
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EXPECT_GE(normal_ticks, previous_normal_ticks);
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EXPECT_GE((normal_ticks - previous_normal_ticks).InMicroseconds(), 0);
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EXPECT_GE(highres_ticks, previous_highres_ticks);
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EXPECT_GE((highres_ticks - previous_highres_ticks).InMicroseconds(), 0);
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previous_normal_ticks = normal_ticks;
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previous_highres_ticks = highres_ticks;
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}
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}
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#if V8_OS_ANDROID
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#define MAYBE_ThreadNow DISABLED_ThreadNow
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#else
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#define MAYBE_ThreadNow ThreadNow
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#endif
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TEST(ThreadTicks, MAYBE_ThreadNow) {
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if (ThreadTicks::IsSupported()) {
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ThreadTicks::WaitUntilInitialized();
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TimeTicks begin = TimeTicks::Now();
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ThreadTicks begin_thread = ThreadTicks::Now();
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// Make sure that ThreadNow value is non-zero.
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EXPECT_GT(begin_thread, ThreadTicks());
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// Sleep for 10 milliseconds to get the thread de-scheduled.
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OS::Sleep(base::TimeDelta::FromMilliseconds(10));
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ThreadTicks end_thread = ThreadTicks::Now();
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TimeTicks end = TimeTicks::Now();
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TimeDelta delta = end - begin;
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TimeDelta delta_thread = end_thread - begin_thread;
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// Make sure that some thread time have elapsed.
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EXPECT_GT(delta_thread.InMicroseconds(), 0);
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// But the thread time is at least 9ms less than clock time.
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TimeDelta difference = delta - delta_thread;
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EXPECT_GE(difference.InMicroseconds(), 9000);
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}
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}
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#if V8_OS_WIN
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TEST(TimeTicks, TimerPerformance) {
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// Verify that various timer mechanisms can always complete quickly.
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// Note: This is a somewhat arbitrary test.
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const int kLoops = 10000;
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typedef TimeTicks (*TestFunc)();
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struct TestCase {
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TestFunc func;
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const char *description;
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};
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// Cheating a bit here: assumes sizeof(TimeTicks) == sizeof(Time)
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// in order to create a single test case list.
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static_assert(sizeof(TimeTicks) == sizeof(Time),
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"TimeTicks and Time must be the same size");
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std::vector<TestCase> cases;
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cases.push_back({reinterpret_cast<TestFunc>(&Time::Now), "Time::Now"});
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cases.push_back({&TimeTicks::Now, "TimeTicks::Now"});
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if (ThreadTicks::IsSupported()) {
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ThreadTicks::WaitUntilInitialized();
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cases.push_back(
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{reinterpret_cast<TestFunc>(&ThreadTicks::Now), "ThreadTicks::Now"});
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}
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for (const auto& test_case : cases) {
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TimeTicks start = TimeTicks::Now();
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for (int index = 0; index < kLoops; index++)
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test_case.func();
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TimeTicks stop = TimeTicks::Now();
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// Turning off the check for acceptible delays. Without this check,
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// the test really doesn't do much other than measure. But the
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// measurements are still useful for testing timers on various platforms.
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// The reason to remove the check is because the tests run on many
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// buildbots, some of which are VMs. These machines can run horribly
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// slow, and there is really no value for checking against a max timer.
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// const int kMaxTime = 35; // Maximum acceptible milliseconds for test.
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// EXPECT_LT((stop - start).InMilliseconds(), kMaxTime);
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printf("%s: %1.2fus per call\n", test_case.description,
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(stop - start).InMillisecondsF() * 1000 / kLoops);
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}
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}
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#endif // V8_OS_WIN
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} // namespace base
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} // namespace v8
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