665e5807bc
[ #188 ] transformer: Allow to provide size hint
...
For big objects with known size we can optimize allocation patterns
by providing size hint. As with any hint, it does not affect transformer
functionality: slices with capacity > MaxSize are never allocated.
```
goos: linux
goarch: amd64
pkg: git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/transformer
cpu: 11th Gen Intel(R) Core(TM) i5-1135G7 @ 2.40GHz
│ out │
│ sec/op │
Transformer/small/no_size_hint-8 65.44µ ± 3%
Transformer/small/no_size_hint,_with_buffer-8 64.24µ ± 5%
Transformer/small/with_size_hint,_with_buffer-8 58.70µ ± 5%
Transformer/big/no_size_hint-8 367.8m ± 3%
Transformer/big/no_size_hint,_with_buffer-8 562.7m ± 0%
Transformer/big/with_size_hint,_with_buffer-8 385.6m ± 7%
geomean 5.197m
│ out │
│ B/op │
Transformer/small/no_size_hint-8 13.40Ki ± 0%
Transformer/small/no_size_hint,_with_buffer-8 13.40Ki ± 0%
Transformer/small/with_size_hint,_with_buffer-8 13.39Ki ± 0%
Transformer/big/no_size_hint-8 288.0Mi ± 0%
Transformer/big/no_size_hint,_with_buffer-8 1.390Gi ± 0%
Transformer/big/with_size_hint,_with_buffer-8 288.0Mi ± 0%
geomean 2.533Mi
│ out │
│ allocs/op │
Transformer/small/no_size_hint-8 92.00 ± 0%
Transformer/small/no_size_hint,_with_buffer-8 92.00 ± 0%
Transformer/small/with_size_hint,_with_buffer-8 92.00 ± 0%
Transformer/big/no_size_hint-8 546.5 ± 0%
Transformer/big/no_size_hint,_with_buffer-8 607.5 ± 0%
Transformer/big/with_size_hint,_with_buffer-8 545.5 ± 0%
geomean 228.1
```
Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>
2023-10-30 12:13:04 +00:00
