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Viewing File: histogram_test.go
// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package runtime_test
import (
"math"
. "runtime"
"testing"
)
var dummyTimeHistogram TimeHistogram
func TestTimeHistogram(t *testing.T) {
// We need to use a global dummy because this
// could get stack-allocated with a non-8-byte alignment.
// The result of this bad alignment is a segfault on
// 32-bit platforms when calling Record.
h := &dummyTimeHistogram
// Record exactly one sample in each bucket.
for j := 0; j < TimeHistNumSubBuckets; j++ {
v := int64(j) << (TimeHistMinBucketBits - 1 - TimeHistSubBucketBits)
for k := 0; k < j; k++ {
// Record a number of times equal to the bucket index.
h.Record(v)
}
}
for i := TimeHistMinBucketBits; i < TimeHistMaxBucketBits; i++ {
base := int64(1) << (i - 1)
for j := 0; j < TimeHistNumSubBuckets; j++ {
v := int64(j) << (i - 1 - TimeHistSubBucketBits)
for k := 0; k < (i+1-TimeHistMinBucketBits)*TimeHistNumSubBuckets+j; k++ {
// Record a number of times equal to the bucket index.
h.Record(base + v)
}
}
}
// Hit the underflow and overflow buckets.
h.Record(int64(-1))
h.Record(math.MaxInt64)
h.Record(math.MaxInt64)
// Check to make sure there's exactly one count in each
// bucket.
for i := 0; i < TimeHistNumBuckets; i++ {
for j := 0; j < TimeHistNumSubBuckets; j++ {
c, ok := h.Count(i, j)
if !ok {
t.Errorf("unexpected invalid bucket: (%d, %d)", i, j)
} else if idx := uint64(i*TimeHistNumSubBuckets + j); c != idx {
t.Errorf("bucket (%d, %d) has count that is not %d: %d", i, j, idx, c)
}
}
}
c, ok := h.Count(-1, 0)
if ok {
t.Errorf("expected to hit underflow bucket: (%d, %d)", -1, 0)
}
if c != 1 {
t.Errorf("overflow bucket has count that is not 1: %d", c)
}
c, ok = h.Count(TimeHistNumBuckets+1, 0)
if ok {
t.Errorf("expected to hit overflow bucket: (%d, %d)", TimeHistNumBuckets+1, 0)
}
if c != 2 {
t.Errorf("overflow bucket has count that is not 2: %d", c)
}
dummyTimeHistogram = TimeHistogram{}
}
func TestTimeHistogramMetricsBuckets(t *testing.T) {
buckets := TimeHistogramMetricsBuckets()
nonInfBucketsLen := TimeHistNumSubBuckets * TimeHistNumBuckets
expBucketsLen := nonInfBucketsLen + 3 // Count -Inf, the edge for the overflow bucket, and +Inf.
if len(buckets) != expBucketsLen {
t.Fatalf("unexpected length of buckets: got %d, want %d", len(buckets), expBucketsLen)
}
// Check some values.
idxToBucket := map[int]float64{
0: math.Inf(-1),
1: 0.0,
2: float64(0x040) / 1e9,
3: float64(0x080) / 1e9,
4: float64(0x0c0) / 1e9,
5: float64(0x100) / 1e9,
6: float64(0x140) / 1e9,
7: float64(0x180) / 1e9,
8: float64(0x1c0) / 1e9,
9: float64(0x200) / 1e9,
10: float64(0x280) / 1e9,
11: float64(0x300) / 1e9,
12: float64(0x380) / 1e9,
13: float64(0x400) / 1e9,
15: float64(0x600) / 1e9,
81: float64(0x8000000) / 1e9,
82: float64(0xa000000) / 1e9,
108: float64(0x380000000) / 1e9,
expBucketsLen - 2: float64(0x1<<47) / 1e9,
expBucketsLen - 1: math.Inf(1),
}
for idx, bucket := range idxToBucket {
if got, want := buckets[idx], bucket; got != want {
t.Errorf("expected bucket %d to have value %e, got %e", idx, want, got)
}
}
}
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