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a571c52b0a
Update to new stdlib apis. The new Float64 is uniform, which resolves a long comment. https://cs.opensource.google/go/go/+/refs/tags/go1.24.2:src/math/rand/v2/rand.go;l=209 > // There are exactly 1<<53 float64s in [0,1). Use Intn(1<<53) / (1<<53). return float64(r.Uint64()<<11>>11) / (1 << 53) ``` goos: linux goarch: amd64 pkg: go.opentelemetry.io/otel/sdk/trace cpu: 12th Gen Intel(R) Core(TM) i7-1260P │ old.txt │ new.txt │ │ sec/op │ sec/op vs base │ TraceStart/with_a_simple_span-16 387.1n ± 5% 306.8n ± 15% -20.73% (p=0.000 n=10) TraceStart/with_several_links-16 542.2n ± 5% 501.0n ± 2% -7.61% (p=0.000 n=10) TraceStart/with_attributes-16 521.4n ± 14% 571.6n ± 6% +9.64% (p=0.009 n=10) geomean 478.3n 444.6n -7.05% │ old.txt │ new.txt │ │ B/op │ B/op vs base │ TraceStart/with_a_simple_span-16 528.0 ± 0% 528.0 ± 0% ~ (p=1.000 n=10) ¹ TraceStart/with_several_links-16 704.0 ± 0% 704.0 ± 0% ~ (p=1.000 n=10) ¹ TraceStart/with_attributes-16 784.0 ± 0% 784.0 ± 0% ~ (p=1.000 n=10) ¹ geomean 663.0 663.0 +0.00% ¹ all samples are equal │ old.txt │ new.txt │ │ allocs/op │ allocs/op vs base │ TraceStart/with_a_simple_span-16 2.000 ± 0% 2.000 ± 0% ~ (p=1.000 n=10) ¹ TraceStart/with_several_links-16 3.000 ± 0% 3.000 ± 0% ~ (p=1.000 n=10) ¹ TraceStart/with_attributes-16 4.000 ± 0% 4.000 ± 0% ~ (p=1.000 n=10) ¹ geomean 2.884 2.884 +0.00% ¹ all samples are equal ``` --------- Co-authored-by: Robert Pająk <pellared@hotmail.com> Co-authored-by: Damien Mathieu <42@dmathieu.com>
70 lines
1.9 KiB
Go
70 lines
1.9 KiB
Go
// Copyright The OpenTelemetry Authors
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// SPDX-License-Identifier: Apache-2.0
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package trace // import "go.opentelemetry.io/otel/sdk/trace"
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import (
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"context"
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"encoding/binary"
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"math/rand/v2"
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"go.opentelemetry.io/otel/trace"
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)
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// IDGenerator allows custom generators for TraceID and SpanID.
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type IDGenerator interface {
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// DO NOT CHANGE: any modification will not be backwards compatible and
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// must never be done outside of a new major release.
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// NewIDs returns a new trace and span ID.
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NewIDs(ctx context.Context) (trace.TraceID, trace.SpanID)
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// DO NOT CHANGE: any modification will not be backwards compatible and
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// must never be done outside of a new major release.
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// NewSpanID returns a ID for a new span in the trace with traceID.
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NewSpanID(ctx context.Context, traceID trace.TraceID) trace.SpanID
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// DO NOT CHANGE: any modification will not be backwards compatible and
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// must never be done outside of a new major release.
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}
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type randomIDGenerator struct{}
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var _ IDGenerator = &randomIDGenerator{}
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// NewSpanID returns a non-zero span ID from a randomly-chosen sequence.
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func (gen *randomIDGenerator) NewSpanID(ctx context.Context, traceID trace.TraceID) trace.SpanID {
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sid := trace.SpanID{}
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for {
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binary.NativeEndian.PutUint64(sid[:], rand.Uint64())
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if sid.IsValid() {
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break
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}
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}
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return sid
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}
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// NewIDs returns a non-zero trace ID and a non-zero span ID from a
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// randomly-chosen sequence.
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func (gen *randomIDGenerator) NewIDs(ctx context.Context) (trace.TraceID, trace.SpanID) {
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tid := trace.TraceID{}
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sid := trace.SpanID{}
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for {
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binary.NativeEndian.PutUint64(tid[:8], rand.Uint64())
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binary.NativeEndian.PutUint64(tid[8:], rand.Uint64())
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if tid.IsValid() {
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break
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}
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}
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for {
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binary.NativeEndian.PutUint64(sid[:], rand.Uint64())
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if sid.IsValid() {
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break
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}
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}
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return tid, sid
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}
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func defaultIDGenerator() IDGenerator {
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return &randomIDGenerator{}
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}
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