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48 lines
2.9 KiB
Markdown
48 lines
2.9 KiB
Markdown
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# Benchmarks for Prysm State Transition
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This package contains the functionality needed for benchmarking Prysms state transitions, this includes its block processing (with and without caching) and epoch processing functions. There is also a benchmark for HashTreeRoot on a large beacon state.
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## Benchmark Configuration
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The following configs are in `config.go`:
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* `ValidatorCount`: Sets the amount of active validators to perform the benchmarks with. Default is 16384.
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* `AttestationsPerEpoch`: Sets the amount of attestations per epoch for the benchmarks to perform with, this affects the amount of attestations in a full block and the amount of attestations per epoch in the state for the `ProcessEpoch` and `HashTreeRoot` benchmark. Default is 128.
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## Generating new SSZ files
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Due to the sheer size of the benchmarking configurations (16384 validators), the files used for benchmarking are pregenerated so there's no wasted computations on generating a genesis state with 16384 validators. This should only be needed if there is a breaking spec change and the tests fail from SSZ issues.
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To generate new files to use for benchmarking, run the below command in the root of Prysm.
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```
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bazel run //tools/benchmark-files-gen -- --output-dir $PRYSMPATH/shared/benchutil/benchmark_files/ --overwrite
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```
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## Running the benchmarks
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To run the ExecuteStateTransition benchmark:
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```bazel test //beacon-chain/core/state:go_default_test --test_filter=BenchmarkExecuteStateTransition_FullBlock --test_arg=-test.bench=BenchmarkExecuteStateTransition_FullBlock```
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To run the ExecuteStateTransition (with cache) benchmark:
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```bazel test //beacon-chain/core/state:go_default_test --test_filter=BenchmarkExecuteStateTransition_WithCache --test_arg=-test.bench=BenchmarkExecuteStateTransition_WithCache```
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To run the ProcessEpoch benchmark:
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```bazel test //beacon-chain/core/state:go_default_test --test_filter=BenchmarkProcessEpoch_2FullEpochs --test_arg=-test.bench=BenchmarkProcessEpoch_2FullEpochs```
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To run the HashTreeRoot benchmark:
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```bazel test //beacon-chain/core/state:go_default_test --test_filter=BenchmarkHashTreeRoot_FullState --test_arg=-test.bench=BenchmarkHashTreeRoot_FullState```
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To run the HashTreeRootState benchmark:
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```bazel test //beacon-chain/core/state:go_default_test --test_filter=BenchmarkHashTreeRootState_FullState --test_arg=-test.bench=BenchmarkHashTreeRootState_FullState```
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Extra flags needed to benchmark properly:
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```--nocache_test_results --test_arg=-test.v --test_timeout=2000 --test_arg=-test.cpuprofile=/tmp/cpu.profile --test_arg=-test.memprofile=/tmp/mem.profile --test_output=streamed```
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## Current Results as of January 2020
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```
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BenchmarkExecuteStateTransition_FullBlock-4 20 2031438030 ns/op
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BenchmarkExecuteStateTransition_WithCache-4 20 1857290454 ns/op
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BenchmarkHashTreeRoot_FullState-4 50 297655834 ns/op
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BenchmarkHashTreeRootState_FullState-4 50 155535883 ns/op
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```
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