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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-16 19:23:18 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-16 19:23:18 +0000 |
commit | 43a123c1ae6613b3efeed291fa552ecd909d3acf (patch) | |
tree | fd92518b7024bc74031f78a1cf9e454b65e73665 /src/runtime/histogram_test.go | |
parent | Initial commit. (diff) | |
download | golang-1.20-43a123c1ae6613b3efeed291fa552ecd909d3acf.tar.xz golang-1.20-43a123c1ae6613b3efeed291fa552ecd909d3acf.zip |
Adding upstream version 1.20.14.upstream/1.20.14upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/runtime/histogram_test.go')
-rw-r--r-- | src/runtime/histogram_test.go | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/src/runtime/histogram_test.go b/src/runtime/histogram_test.go new file mode 100644 index 0000000..5246e86 --- /dev/null +++ b/src/runtime/histogram_test.go @@ -0,0 +1,112 @@ +// 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) + } + } +} |