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// Copyright (c) 2006-2008 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.
// Test of Histogram class
#include "base/histogram.h"
#include "base/string_util.h"
#include "base/time.h"
#include "testing/gtest/include/gtest/gtest.h"
using base::TimeDelta;
namespace {
class HistogramTest : public testing::Test {
};
// Check for basic syntax and use.
TEST(HistogramTest, StartupShutdownTest) {
// Try basic construction
scoped_refptr<Histogram> histogram = Histogram::FactoryGet(
"TestHistogram", 1, 1000, 10, Histogram::kNoFlags);
scoped_refptr<Histogram> histogram1 = Histogram::FactoryGet(
"Test1Histogram", 1, 1000, 10, Histogram::kNoFlags);
scoped_refptr<Histogram> linear_histogram = LinearHistogram::FactoryGet(
"TestLinearHistogram", 1, 1000, 10, Histogram::kNoFlags);
scoped_refptr<Histogram> linear_histogram1 = LinearHistogram::FactoryGet(
"Test1LinearHistogram", 1, 1000, 10, Histogram::kNoFlags);
// Use standard macros (but with fixed samples)
HISTOGRAM_TIMES("Test2Histogram", TimeDelta::FromDays(1));
HISTOGRAM_COUNTS("Test3Histogram", 30);
DHISTOGRAM_TIMES("Test4Histogram", TimeDelta::FromDays(1));
DHISTOGRAM_COUNTS("Test5Histogram", 30);
HISTOGRAM_ENUMERATION("Test6Histogram", 129, 130);
// Try to construct samples.
Histogram::SampleSet sample1;
Histogram::SampleSet sample2;
// Use copy constructor of SampleSet
sample1 = sample2;
Histogram::SampleSet sample3(sample1);
// Finally test a statistics recorder, without really using it.
StatisticsRecorder recorder;
}
// Repeat with a recorder present to register with.
TEST(HistogramTest, RecordedStartupTest) {
// Test a statistics recorder, by letting histograms register.
StatisticsRecorder recorder; // This initializes the global state.
StatisticsRecorder::Histograms histograms;
EXPECT_EQ(0U, histograms.size());
StatisticsRecorder::GetHistograms(&histograms); // Load up lists
EXPECT_EQ(0U, histograms.size());
// Try basic construction
scoped_refptr<Histogram> histogram = Histogram::FactoryGet(
"TestHistogram", 1, 1000, 10, Histogram::kNoFlags);
histograms.clear();
StatisticsRecorder::GetHistograms(&histograms); // Load up lists
EXPECT_EQ(1U, histograms.size());
scoped_refptr<Histogram> histogram1 = Histogram::FactoryGet(
"Test1Histogram", 1, 1000, 10, Histogram::kNoFlags);
histograms.clear();
StatisticsRecorder::GetHistograms(&histograms); // Load up lists
EXPECT_EQ(2U, histograms.size());
scoped_refptr<Histogram> linear_histogram = LinearHistogram::FactoryGet(
"TestLinearHistogram", 1, 1000, 10, Histogram::kNoFlags);
scoped_refptr<Histogram> linear_histogram1 = LinearHistogram::FactoryGet(
"Test1LinearHistogram", 1, 1000, 10, Histogram::kNoFlags);
histograms.clear();
StatisticsRecorder::GetHistograms(&histograms); // Load up lists
EXPECT_EQ(4U, histograms.size());
// Use standard macros (but with fixed samples)
HISTOGRAM_TIMES("Test2Histogram", TimeDelta::FromDays(1));
HISTOGRAM_COUNTS("Test3Histogram", 30);
histograms.clear();
StatisticsRecorder::GetHistograms(&histograms); // Load up lists
EXPECT_EQ(6U, histograms.size());
HISTOGRAM_ENUMERATION("TestEnumerationHistogram", 20, 200);
histograms.clear();
StatisticsRecorder::GetHistograms(&histograms); // Load up lists
EXPECT_EQ(7U, histograms.size());
DHISTOGRAM_TIMES("Test4Histogram", TimeDelta::FromDays(1));
DHISTOGRAM_COUNTS("Test5Histogram", 30);
histograms.clear();
StatisticsRecorder::GetHistograms(&histograms); // Load up lists
#ifndef NDEBUG
EXPECT_EQ(9U, histograms.size());
#else
EXPECT_EQ(7U, histograms.size());
#endif
}
TEST(HistogramTest, RangeTest) {
StatisticsRecorder recorder;
StatisticsRecorder::Histograms histograms;
recorder.GetHistograms(&histograms);
EXPECT_EQ(0U, histograms.size());
scoped_refptr<Histogram> histogram = Histogram::FactoryGet(
"Histogram", 1, 64, 8, Histogram::kNoFlags); // As per header file.
// Check that we got a nice exponential when there was enough rooom.
EXPECT_EQ(0, histogram->ranges(0));
int power_of_2 = 1;
for (int i = 1; i < 8; i++) {
EXPECT_EQ(power_of_2, histogram->ranges(i));
power_of_2 *= 2;
}
EXPECT_EQ(INT_MAX, histogram->ranges(8));
scoped_refptr<Histogram> short_histogram = Histogram::FactoryGet(
"Histogram Shortened", 1, 7, 8, Histogram::kNoFlags);
// Check that when the number of buckets is short, we get a linear histogram
// for lack of space to do otherwise.
for (int i = 0; i < 8; i++)
EXPECT_EQ(i, short_histogram->ranges(i));
EXPECT_EQ(INT_MAX, short_histogram->ranges(8));
scoped_refptr<Histogram> linear_histogram = LinearHistogram::FactoryGet(
"Linear", 1, 7, 8, Histogram::kNoFlags);
// We also get a nice linear set of bucket ranges when we ask for it
for (int i = 0; i < 8; i++)
EXPECT_EQ(i, linear_histogram->ranges(i));
EXPECT_EQ(INT_MAX, linear_histogram->ranges(8));
scoped_refptr<Histogram> linear_broad_histogram = LinearHistogram::FactoryGet(
"Linear widened", 2, 14, 8, Histogram::kNoFlags);
// ...but when the list has more space, then the ranges naturally spread out.
for (int i = 0; i < 8; i++)
EXPECT_EQ(2 * i, linear_broad_histogram->ranges(i));
EXPECT_EQ(INT_MAX, linear_broad_histogram->ranges(8));
scoped_refptr<Histogram> transitioning_histogram =
Histogram::FactoryGet("LinearAndExponential", 1, 32, 15,
Histogram::kNoFlags);
// When space is a little tight, we transition from linear to exponential.
EXPECT_EQ(0, transitioning_histogram->ranges(0));
EXPECT_EQ(1, transitioning_histogram->ranges(1));
EXPECT_EQ(2, transitioning_histogram->ranges(2));
EXPECT_EQ(3, transitioning_histogram->ranges(3));
EXPECT_EQ(4, transitioning_histogram->ranges(4));
EXPECT_EQ(5, transitioning_histogram->ranges(5));
EXPECT_EQ(6, transitioning_histogram->ranges(6));
EXPECT_EQ(7, transitioning_histogram->ranges(7));
EXPECT_EQ(9, transitioning_histogram->ranges(8));
EXPECT_EQ(11, transitioning_histogram->ranges(9));
EXPECT_EQ(14, transitioning_histogram->ranges(10));
EXPECT_EQ(17, transitioning_histogram->ranges(11));
EXPECT_EQ(21, transitioning_histogram->ranges(12));
EXPECT_EQ(26, transitioning_histogram->ranges(13));
EXPECT_EQ(32, transitioning_histogram->ranges(14));
EXPECT_EQ(INT_MAX, transitioning_histogram->ranges(15));
recorder.GetHistograms(&histograms);
EXPECT_EQ(5U, histograms.size());
}
// Make sure histogram handles out-of-bounds data gracefully.
TEST(HistogramTest, BoundsTest) {
const size_t kBucketCount = 50;
scoped_refptr<Histogram> histogram = Histogram::FactoryGet(
"Bounded", 10, 100, kBucketCount, Histogram::kNoFlags);
// Put two samples "out of bounds" above and below.
histogram->Add(5);
histogram->Add(-50);
histogram->Add(100);
histogram->Add(10000);
// Verify they landed in the underflow, and overflow buckets.
Histogram::SampleSet sample;
histogram->SnapshotSample(&sample);
EXPECT_EQ(2, sample.counts(0));
EXPECT_EQ(0, sample.counts(1));
size_t array_size = histogram->bucket_count();
EXPECT_EQ(kBucketCount, array_size);
EXPECT_EQ(0, sample.counts(array_size - 2));
EXPECT_EQ(2, sample.counts(array_size - 1));
}
// Check to be sure samples land as expected is "correct" buckets.
TEST(HistogramTest, BucketPlacementTest) {
scoped_refptr<Histogram> histogram = Histogram::FactoryGet(
"Histogram", 1, 64, 8, Histogram::kNoFlags); // As per header file.
// Check that we got a nice exponential since there was enough rooom.
EXPECT_EQ(0, histogram->ranges(0));
int power_of_2 = 1;
for (int i = 1; i < 8; i++) {
EXPECT_EQ(power_of_2, histogram->ranges(i));
power_of_2 *= 2;
}
EXPECT_EQ(INT_MAX, histogram->ranges(8));
// Add i+1 samples to the i'th bucket.
histogram->Add(0);
power_of_2 = 1;
for (int i = 1; i < 8; i++) {
for (int j = 0; j <= i; j++)
histogram->Add(power_of_2);
power_of_2 *= 2;
}
// Leave overflow bucket empty.
// Check to see that the bucket counts reflect our additions.
Histogram::SampleSet sample;
histogram->SnapshotSample(&sample);
EXPECT_EQ(INT_MAX, histogram->ranges(8));
for (int i = 0; i < 8; i++)
EXPECT_EQ(i + 1, sample.counts(i));
}
} // namespace
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