feat: speed up ProtoMethods #108
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elias-orijtech
changed the title
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Added another optimization. Let me know if they belong in separate PRs. |
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I believe the remaining allocations are intrinsic to the serialization process, and thus cannot be reduced further. |
The ProtoMethods is called for every unmarshal, which in turn allocates
an protoiface.Methods. The Methods object does not refer to a partucular
message object, so the allocation can be saved by one-time initialization
at startup.
Found by the the alecthomas/go_serialization_benchmarks suite:
go test -bench='Pulsar' -memprofile mem.out -cpu 6 ./
Before:
goos: darwin
goarch: arm64
pkg: github.com/alecthomas/go_serialization_benchmarks
Benchmark_Pulsar_Marshal-6 7480744 154.1 ns/op 51.57 B/serial 96 B/op 2 allocs/op
Benchmark_Pulsar_Unmarshal-6 5057922 236.9 ns/op 51.60 B/serial 256 B/op 7 allocs/op
After:
Benchmark_Pulsar_Marshal-6 7251019 153.9 ns/op 51.57 B/serial 96 B/op 2 allocs/op
Benchmark_Pulsar_Unmarshal-6 6409070 187.2 ns/op 51.63 B/serial 160 B/op 5 allocs/op
CheckInitialized checks for missing required fields, which is not relevant for a proto3 implementation such as Pulsar. However, without it protobuf will fall back to a slow fallback that allocates memory per serialization. Before: Benchmark_Pulsar_Marshal-6 7251019 153.9 ns/op 51.57 B/serial 96 B/op 2 allocs/op Benchmark_Pulsar_Unmarshal-6 6409070 187.2 ns/op 51.63 B/serial 160 B/op 5 allocs/op After: Benchmark_Pulsar_Marshal-6 12480471 91.47 ns/op 51.61 B/serial 128 B/op 2 allocs/op Benchmark_Pulsar_Unmarshal-6 10919157 108.6 ns/op 51.58 B/serial 128 B/op 3 allocs/op
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The ProtoMethods is called for every unmarshal, which in turn allocates an protoiface.Methods. The Methods object does not refer to a partucular message object, so the allocation can be saved by one-time initialization at startup.
Found by the the alecthomas/go_serialization_benchmarks suite:
Before:
goos: darwin
goarch: arm64
pkg: github.com/alecthomas/go_serialization_benchmarks
Benchmark_Pulsar_Marshal-6 7480744 154.1 ns/op 51.57 B/serial 96 B/op 2 allocs/op
Benchmark_Pulsar_Unmarshal-6 5057922 236.9 ns/op 51.60 B/serial 256 B/op 7 allocs/op
After:
Benchmark_Pulsar_Marshal-6 7251019 153.9 ns/op 51.57 B/serial 96 B/op 2 allocs/op
Benchmark_Pulsar_Unmarshal-6 6409070 187.2 ns/op 51.63 B/serial 160 B/op 5 allocs/op
CC @tac0turtle @odeke-em