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3429e15b9a
Topic: #5249
This reverts commit 8041156518 (PR: #5899)
due to the performance degradation found by Benchmarks CI
https://github.com/open-telemetry/opentelemetry-go/actions/runs/11447364022/job/31848519243
Here is the benchmark test on my machine:
```
goos: darwin
goarch: arm64
pkg: go.opentelemetry.io/otel/sdk/metric
│ old.txt │ new.txt │
│ sec/op │ sec/op vs base │
Instrument/instrumentImpl/aggregate-10 3.378µ ± 3% 49.366µ ± 1% +1361.40% (p=0.000 n=10)
Instrument/observable/observe-10 2.288µ ± 2% 37.791µ ± 1% +1551.73% (p=0.000 n=10)
geomean 2.780µ 43.19µ +1453.65%
│ old.txt │ new.txt │
│ B/op │ B/op vs base │
Instrument/instrumentImpl/aggregate-10 1.245Ki ± 1% 22.363Ki ± 0% +1696.08% (p=0.000 n=10)
Instrument/observable/observe-10 823.0 ± 1% 17432.5 ± 0% +2018.17% (p=0.000 n=10)
geomean 1.000Ki 19.51Ki +1850.48%
│ old.txt │ new.txt │
│ allocs/op │ allocs/op vs base │
Instrument/instrumentImpl/aggregate-10 1.000 ± 0% 21.000 ± 0% +2000.00% (p=0.000 n=10)
Instrument/observable/observe-10 1.000 ± 0% 16.000 ± 0% +1500.00% (p=0.000 n=10)
```
78 lines
3.1 KiB
Go
78 lines
3.1 KiB
Go
// Copyright The OpenTelemetry Authors
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// SPDX-License-Identifier: Apache-2.0
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package metric // import "go.opentelemetry.io/otel/sdk/metric"
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import (
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"runtime"
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"go.opentelemetry.io/otel/attribute"
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"go.opentelemetry.io/otel/sdk/metric/exemplar"
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"go.opentelemetry.io/otel/sdk/metric/internal/aggregate"
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)
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// ExemplarReservoirProviderSelector selects the
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// [exemplar.ReservoirProvider] to use
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// based on the [Aggregation] of the metric.
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type ExemplarReservoirProviderSelector func(Aggregation) exemplar.ReservoirProvider
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// reservoirFunc returns the appropriately configured exemplar reservoir
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// creation func based on the passed InstrumentKind and filter configuration.
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func reservoirFunc[N int64 | float64](provider exemplar.ReservoirProvider, filter exemplar.Filter) func(attribute.Set) aggregate.FilteredExemplarReservoir[N] {
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return func(attrs attribute.Set) aggregate.FilteredExemplarReservoir[N] {
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return aggregate.NewFilteredExemplarReservoir[N](filter, provider(attrs))
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}
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}
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// DefaultExemplarReservoirProviderSelector returns the default
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// [exemplar.ReservoirProvider] for the
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// provided [Aggregation].
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//
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// For explicit bucket histograms with more than 1 bucket, it uses the
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// [exemplar.HistogramReservoirProvider].
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// For exponential histograms, it uses the
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// [exemplar.FixedSizeReservoirProvider]
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// with a size of min(20, max_buckets).
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// For all other aggregations, it uses the
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// [exemplar.FixedSizeReservoirProvider]
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// with a size equal to the number of CPUs.
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//
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// Exemplar default reservoirs MAY change in a minor version bump. No
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// guarantees are made on the shape or statistical properties of returned
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// exemplars.
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func DefaultExemplarReservoirProviderSelector(agg Aggregation) exemplar.ReservoirProvider {
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// https://github.com/open-telemetry/opentelemetry-specification/blob/d4b241f451674e8f611bb589477680341006ad2b/specification/metrics/sdk.md#exemplar-defaults
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// Explicit bucket histogram aggregation with more than 1 bucket will
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// use AlignedHistogramBucketExemplarReservoir.
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a, ok := agg.(AggregationExplicitBucketHistogram)
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if ok && len(a.Boundaries) > 0 {
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return exemplar.HistogramReservoirProvider(a.Boundaries)
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}
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var n int
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if a, ok := agg.(AggregationBase2ExponentialHistogram); ok {
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// Base2 Exponential Histogram Aggregation SHOULD use a
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// SimpleFixedSizeExemplarReservoir with a reservoir equal to the
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// smaller of the maximum number of buckets configured on the
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// aggregation or twenty (e.g. min(20, max_buckets)).
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n = int(a.MaxSize)
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if n > 20 {
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n = 20
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}
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} else {
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// https://github.com/open-telemetry/opentelemetry-specification/blob/e94af89e3d0c01de30127a0f423e912f6cda7bed/specification/metrics/sdk.md#simplefixedsizeexemplarreservoir
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// This Exemplar reservoir MAY take a configuration parameter for
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// the size of the reservoir. If no size configuration is
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// provided, the default size MAY be the number of possible
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// concurrent threads (e.g. number of CPUs) to help reduce
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// contention. Otherwise, a default size of 1 SHOULD be used.
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n = runtime.NumCPU()
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if n < 1 {
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// Should never be the case, but be defensive.
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n = 1
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}
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}
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return exemplar.FixedSizeReservoirProvider(n)
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}
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