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v8/test/unittests/heap/gc-tracer-unittest.cc
jochen ad99b196cb Introduce a CompilerDispatcherTracer and track how long jobs take 
R=ulan@chromium.org,cbruni@chromium.org,rmcilroy@chromium.org
BUG=v8:5215

Review-Url: https://codereview.chromium.org/2413243002
Cr-Commit-Position: refs/heads/master@{#40295}
2016-10-14 08:12:44 +00:00

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// Copyright 2014 the V8 project 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 <cmath>
#include <limits>
#include "src/globals.h"
#include "src/heap/gc-tracer.h"
#include "src/isolate.h"
#include "test/unittests/test-utils.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace v8 {
namespace internal {
typedef TestWithContext GCTracerTest;
TEST(GCTracer, AverageSpeed) {
base::RingBuffer<BytesAndDuration> buffer;
EXPECT_EQ(100 / 2,
GCTracer::AverageSpeed(buffer, MakeBytesAndDuration(100, 2), 0));
buffer.Push(MakeBytesAndDuration(100, 8));
EXPECT_EQ(100 / 2,
GCTracer::AverageSpeed(buffer, MakeBytesAndDuration(100, 2), 2));
EXPECT_EQ(200 / 10,
GCTracer::AverageSpeed(buffer, MakeBytesAndDuration(100, 2), 3));
const int max_speed = 1024 * MB;
buffer.Reset();
buffer.Push(MakeBytesAndDuration(max_speed, 0.5));
EXPECT_EQ(max_speed,
GCTracer::AverageSpeed(buffer, MakeBytesAndDuration(0, 0), 1));
const int min_speed = 1;
buffer.Reset();
buffer.Push(MakeBytesAndDuration(1, 10000));
EXPECT_EQ(min_speed,
GCTracer::AverageSpeed(buffer, MakeBytesAndDuration(0, 0), 1));
buffer.Reset();
int sum = 0;
for (int i = 0; i < buffer.kSize; i++) {
sum += i + 1;
buffer.Push(MakeBytesAndDuration(i + 1, 1));
}
EXPECT_EQ(
sum * 1.0 / buffer.kSize,
GCTracer::AverageSpeed(buffer, MakeBytesAndDuration(0, 0), buffer.kSize));
buffer.Push(MakeBytesAndDuration(100, 1));
EXPECT_EQ(
(sum * 1.0 - 1 + 100) / buffer.kSize,
GCTracer::AverageSpeed(buffer, MakeBytesAndDuration(0, 0), buffer.kSize));
}
namespace {
void SampleAndAddAllocaton(v8::internal::GCTracer* tracer, double time_ms,
size_t new_space_counter_bytes,
size_t old_generation_counter_bytes) {
tracer->SampleAllocation(time_ms, new_space_counter_bytes,
old_generation_counter_bytes);
tracer->AddAllocation(time_ms);
}
} // namespace
TEST_F(GCTracerTest, AllocationThroughput) {
GCTracer* tracer = i_isolate()->heap()->tracer();
tracer->ResetForTesting();
int time1 = 100;
size_t counter1 = 1000;
// First sample creates baseline but is not part of the recorded samples.
tracer->SampleAllocation(time1, counter1, counter1);
SampleAndAddAllocaton(tracer, time1, counter1, counter1);
int time2 = 200;
size_t counter2 = 2000;
SampleAndAddAllocaton(tracer, time2, counter2, counter2);
// Will only consider the current sample.
size_t throughput = static_cast<size_t>(
tracer->AllocationThroughputInBytesPerMillisecond(100));
EXPECT_EQ(2 * (counter2 - counter1) / (time2 - time1), throughput);
int time3 = 1000;
size_t counter3 = 30000;
SampleAndAddAllocaton(tracer, time3, counter3, counter3);
// Considers last 2 samples.
throughput = tracer->AllocationThroughputInBytesPerMillisecond(801);
EXPECT_EQ(2 * (counter3 - counter1) / (time3 - time1), throughput);
}
TEST_F(GCTracerTest, NewSpaceAllocationThroughput) {
GCTracer* tracer = i_isolate()->heap()->tracer();
tracer->ResetForTesting();
int time1 = 100;
size_t counter1 = 1000;
SampleAndAddAllocaton(tracer, time1, counter1, 0);
int time2 = 200;
size_t counter2 = 2000;
SampleAndAddAllocaton(tracer, time2, counter2, 0);
size_t throughput =
tracer->NewSpaceAllocationThroughputInBytesPerMillisecond();
EXPECT_EQ((counter2 - counter1) / (time2 - time1), throughput);
int time3 = 1000;
size_t counter3 = 30000;
SampleAndAddAllocaton(tracer, time3, counter3, 0);
throughput = tracer->NewSpaceAllocationThroughputInBytesPerMillisecond();
EXPECT_EQ((counter3 - counter1) / (time3 - time1), throughput);
}
TEST_F(GCTracerTest, NewSpaceAllocationThroughputWithProvidedTime) {
GCTracer* tracer = i_isolate()->heap()->tracer();
tracer->ResetForTesting();
int time1 = 100;
size_t counter1 = 1000;
// First sample creates baseline but is not part of the recorded samples.
SampleAndAddAllocaton(tracer, time1, counter1, 0);
int time2 = 200;
size_t counter2 = 2000;
SampleAndAddAllocaton(tracer, time2, counter2, 0);
// Will only consider the current sample.
size_t throughput =
tracer->NewSpaceAllocationThroughputInBytesPerMillisecond(100);
EXPECT_EQ((counter2 - counter1) / (time2 - time1), throughput);
int time3 = 1000;
size_t counter3 = 30000;
SampleAndAddAllocaton(tracer, time3, counter3, 0);
// Considers last 2 samples.
throughput = tracer->NewSpaceAllocationThroughputInBytesPerMillisecond(801);
EXPECT_EQ((counter3 - counter1) / (time3 - time1), throughput);
}
TEST_F(GCTracerTest, OldGenerationAllocationThroughputWithProvidedTime) {
GCTracer* tracer = i_isolate()->heap()->tracer();
tracer->ResetForTesting();
int time1 = 100;
size_t counter1 = 1000;
// First sample creates baseline but is not part of the recorded samples.
SampleAndAddAllocaton(tracer, time1, 0, counter1);
int time2 = 200;
size_t counter2 = 2000;
SampleAndAddAllocaton(tracer, time2, 0, counter2);
// Will only consider the current sample.
size_t throughput = static_cast<size_t>(
tracer->OldGenerationAllocationThroughputInBytesPerMillisecond(100));
EXPECT_EQ((counter2 - counter1) / (time2 - time1), throughput);
int time3 = 1000;
size_t counter3 = 30000;
SampleAndAddAllocaton(tracer, time3, 0, counter3);
// Considers last 2 samples.
throughput = static_cast<size_t>(
tracer->OldGenerationAllocationThroughputInBytesPerMillisecond(801));
EXPECT_EQ((counter3 - counter1) / (time3 - time1), throughput);
}
TEST_F(GCTracerTest, RegularScope) {
GCTracer* tracer = i_isolate()->heap()->tracer();
tracer->ResetForTesting();
EXPECT_DOUBLE_EQ(0.0, tracer->current_.scopes[GCTracer::Scope::MC_MARK]);
// Sample not added because it's not within a started tracer.
tracer->AddScopeSample(GCTracer::Scope::MC_MARK, 100);
tracer->Start(MARK_COMPACTOR, GarbageCollectionReason::kTesting,
"collector unittest");
tracer->AddScopeSample(GCTracer::Scope::MC_MARK, 100);
tracer->Stop(MARK_COMPACTOR);
EXPECT_DOUBLE_EQ(100.0, tracer->current_.scopes[GCTracer::Scope::MC_MARK]);
}
TEST_F(GCTracerTest, IncrementalScope) {
GCTracer* tracer = i_isolate()->heap()->tracer();
tracer->ResetForTesting();
EXPECT_DOUBLE_EQ(
0.0, tracer->current_.scopes[GCTracer::Scope::MC_INCREMENTAL_FINALIZE]);
// Sample is added because its ScopeId is listed as incremental sample.
tracer->AddScopeSample(GCTracer::Scope::MC_INCREMENTAL_FINALIZE, 100);
tracer->Start(MARK_COMPACTOR, GarbageCollectionReason::kTesting,
"collector unittest");
// Switch to incremental MC to enable writing back incremental scopes.
tracer->current_.type = GCTracer::Event::INCREMENTAL_MARK_COMPACTOR;
tracer->AddScopeSample(GCTracer::Scope::MC_INCREMENTAL_FINALIZE, 100);
tracer->Stop(MARK_COMPACTOR);
EXPECT_DOUBLE_EQ(
200.0, tracer->current_.scopes[GCTracer::Scope::MC_INCREMENTAL_FINALIZE]);
}
TEST_F(GCTracerTest, IncrementalMarkingDetails) {
GCTracer* tracer = i_isolate()->heap()->tracer();
tracer->ResetForTesting();
// Round 1.
tracer->AddScopeSample(GCTracer::Scope::MC_INCREMENTAL_FINALIZE, 50);
// Scavenger has no impact on incremental marking details.
tracer->Start(SCAVENGER, GarbageCollectionReason::kTesting,
"collector unittest");
tracer->Stop(SCAVENGER);
tracer->Start(MARK_COMPACTOR, GarbageCollectionReason::kTesting,
"collector unittest");
// Switch to incremental MC to enable writing back incremental scopes.
tracer->current_.type = GCTracer::Event::INCREMENTAL_MARK_COMPACTOR;
tracer->AddScopeSample(GCTracer::Scope::MC_INCREMENTAL_FINALIZE, 100);
tracer->Stop(MARK_COMPACTOR);
EXPECT_DOUBLE_EQ(
100,
tracer->current_
.incremental_marking_scopes[GCTracer::Scope::MC_INCREMENTAL_FINALIZE]
.longest_step);
EXPECT_EQ(
2,
tracer->current_
.incremental_marking_scopes[GCTracer::Scope::MC_INCREMENTAL_FINALIZE]
.steps);
EXPECT_DOUBLE_EQ(
150,
tracer->current_
.incremental_marking_scopes[GCTracer::Scope::MC_INCREMENTAL_FINALIZE]
.duration);
// Round 2. Numbers should be reset.
tracer->AddScopeSample(GCTracer::Scope::MC_INCREMENTAL_FINALIZE, 13);
tracer->AddScopeSample(GCTracer::Scope::MC_INCREMENTAL_FINALIZE, 15);
tracer->Start(MARK_COMPACTOR, GarbageCollectionReason::kTesting,
"collector unittest");
// Switch to incremental MC to enable writing back incremental scopes.
tracer->current_.type = GCTracer::Event::INCREMENTAL_MARK_COMPACTOR;
tracer->AddScopeSample(GCTracer::Scope::MC_INCREMENTAL_FINALIZE, 122);
tracer->Stop(MARK_COMPACTOR);
EXPECT_DOUBLE_EQ(
122,
tracer->current_
.incremental_marking_scopes[GCTracer::Scope::MC_INCREMENTAL_FINALIZE]
.longest_step);
EXPECT_EQ(
3,
tracer->current_
.incremental_marking_scopes[GCTracer::Scope::MC_INCREMENTAL_FINALIZE]
.steps);
EXPECT_DOUBLE_EQ(
150,
tracer->current_
.incremental_marking_scopes[GCTracer::Scope::MC_INCREMENTAL_FINALIZE]
.duration);
}
TEST_F(GCTracerTest, IncrementalMarkingSpeed) {
GCTracer* tracer = i_isolate()->heap()->tracer();
tracer->ResetForTesting();
// Round 1.
// 1000000 bytes in 100ms.
tracer->AddIncrementalMarkingStep(100, 1000000);
EXPECT_EQ(1000000 / 100,
tracer->IncrementalMarkingSpeedInBytesPerMillisecond());
// 1000000 bytes in 100ms.
tracer->AddIncrementalMarkingStep(100, 1000000);
EXPECT_EQ(1000000 / 100,
tracer->IncrementalMarkingSpeedInBytesPerMillisecond());
// Scavenger has no impact on incremental marking details.
tracer->Start(SCAVENGER, GarbageCollectionReason::kTesting,
"collector unittest");
tracer->Stop(SCAVENGER);
// 1000000 bytes in 100ms.
tracer->AddIncrementalMarkingStep(100, 1000000);
EXPECT_EQ(300, tracer->incremental_marking_duration_);
EXPECT_EQ(3000000, tracer->incremental_marking_bytes_);
EXPECT_EQ(1000000 / 100,
tracer->IncrementalMarkingSpeedInBytesPerMillisecond());
tracer->Start(MARK_COMPACTOR, GarbageCollectionReason::kTesting,
"collector unittest");
// Switch to incremental MC.
tracer->current_.type = GCTracer::Event::INCREMENTAL_MARK_COMPACTOR;
// 1000000 bytes in 100ms.
tracer->AddIncrementalMarkingStep(100, 1000000);
EXPECT_EQ(400, tracer->incremental_marking_duration_);
EXPECT_EQ(4000000, tracer->incremental_marking_bytes_);
tracer->Stop(MARK_COMPACTOR);
EXPECT_EQ(400, tracer->current_.incremental_marking_duration);
EXPECT_EQ(4000000, tracer->current_.incremental_marking_bytes);
EXPECT_EQ(0, tracer->incremental_marking_duration_);
EXPECT_EQ(0, tracer->incremental_marking_bytes_);
EXPECT_EQ(1000000 / 100,
tracer->IncrementalMarkingSpeedInBytesPerMillisecond());
// Round 2.
tracer->AddIncrementalMarkingStep(2000, 1000);
tracer->Start(MARK_COMPACTOR, GarbageCollectionReason::kTesting,
"collector unittest");
// Switch to incremental MC.
tracer->current_.type = GCTracer::Event::INCREMENTAL_MARK_COMPACTOR;
tracer->Stop(MARK_COMPACTOR);
EXPECT_DOUBLE_EQ((4000000.0 / 400 + 1000.0 / 2000) / 2,
static_cast<double>(
tracer->IncrementalMarkingSpeedInBytesPerMillisecond()));
}
} // namespace internal
} // namespace v8
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