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Replace fnv with xxhash (#7497)

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**Objective**:
- Performance comparison between fnv and xxhash in terms of ops/sec,
allocations and collisions
- Implement xxhash according to first objective

**Changes**:
- fnv is replaced by xxhash. 
  Perform stats:
  - **Collision**: No collision upto 100M
  - **Allocations**: Same in both cases
- **Ops/sec**: xxhash performed better in cases with medium to large
strings
 
 **Benchmarks**:
 ```
 benchstat old.txt new.txt
goos: darwin
goarch: arm64
pkg: go.opentelemetry.io/otel/attribute
cpu: Apple M2
│ old.txt │ new.txt │
│ sec/op │ sec/op vs base │
NewSet-8 205.5n ± 1% 229.4n ± 1% +11.61% (p=0.002 n=6)
NewSetSmallStrings-8 160.5n ± 1% 169.0n ± 5% +5.26% (p=0.002 n=6)
NewSetMediumStrings-8 263.8n ± 6% 185.0n ± 1% -29.89% (p=0.002 n=6)
NewSetLargeStrings-8 426.4n ± 9% 210.2n ± 1% -50.72% (p=0.002 n=6)
NewSetVeryLargeStrings-8 1012.5n ± 7% 238.7n ± 2% -76.43% (p=0.002 n=6)
NewSetHugeStrings-8 3622.0n ± 8% 397.1n ± 1% -89.04% (p=0.002 n=6)
geomean                     488.6n        228.6n       -53.21%

│ old.txt │ new.txt │
│ B/op │ B/op vs base │
NewSet-8 448.0 ± 0% 448.0 ± 0% ~ (p=1.000 n=6) ¹
NewSetSmallStrings-8 320.0 ± 0% 320.0 ± 0% ~ (p=1.000 n=6) ¹
NewSetMediumStrings-8 320.0 ± 0% 320.0 ± 0% ~ (p=1.000 n=6) ¹
NewSetLargeStrings-8 320.0 ± 0% 320.0 ± 0% ~ (p=1.000 n=6) ¹
NewSetVeryLargeStrings-8 320.0 ± 0% 320.0 ± 0% ~ (p=1.000 n=6) ¹
NewSetHugeStrings-8 320.0 ± 0% 320.0 ± 0% ~ (p=1.000 n=6) ¹
geomean                    338.5        338.5       +0.00%
¹ all samples are equal

│ old.txt │ new.txt │
│ allocs/op │ allocs/op vs base │
NewSet-8 1.000 ± 0% 1.000 ± 0% ~ (p=1.000 n=6) ¹
NewSetSmallStrings-8 1.000 ± 0% 1.000 ± 0% ~ (p=1.000 n=6) ¹
NewSetMediumStrings-8 1.000 ± 0% 1.000 ± 0% ~ (p=1.000 n=6) ¹
NewSetLargeStrings-8 1.000 ± 0% 1.000 ± 0% ~ (p=1.000 n=6) ¹
NewSetVeryLargeStrings-8 1.000 ± 0% 1.000 ± 0% ~ (p=1.000 n=6) ¹
NewSetHugeStrings-8 1.000 ± 0% 1.000 ± 0% ~ (p=1.000 n=6) ¹
geomean                    1.000        1.000       +0.00%
¹ all samples are equal
```

Previous implementation for reference: 
https://github.com/open-telemetry/opentelemetry-go/blame/d0483a7c89d936dcced557fb523465daeac16967/CHANGELOG.md#L16

---------

Co-authored-by: Robert Pająk <pellared@hotmail.com>
This commit is contained in:
Preeti Dewani
2025-11-19 15:36:20 +05:30
committed by GitHub
parent 98eb065c75
commit 49292857b7
55 changed files with 403 additions and 195 deletions
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go.mod
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@@ -3,6 +3,7 @@ module go.opentelemetry.io/otel
go 1.24.0
require (
github.com/cespare/xxhash/v2 v2.3.0
github.com/go-logr/logr v1.4.3
github.com/go-logr/stdr v1.2.2
github.com/google/go-cmp v0.7.0