43 lines
1.7 KiB
Markdown
43 lines
1.7 KiB
Markdown
# Identifier interning benchmark
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Run from the repository root:
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```sh
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odin run benchmarks/symbols -o:speed
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```
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The benchmark warms the pipeline once, then measures a fresh lex/parse/check
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run over a generated program with 5,000 repeated identifier-heavy statements.
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Timing is informational; token layout and allocation metrics are the stable
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comparison points.
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Results captured on 2026-06-10 with Odin `dev-2026-02:b942f72cb`:
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| Metric | Before interning | After interning |
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| --- | ---: | ---: |
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| Elapsed time | 15.723 ms | 9.248 ms |
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| Peak memory | 14,661,846 bytes | 13,220,507 bytes |
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| Allocations | 40,105 | 40,112 |
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| Token count | 65,032 | 65,032 |
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| Token size | 56 bytes | 48 bytes |
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| Unique symbols | n/a | 5 |
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| Stored symbol bytes | n/a | 21 |
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| Diagnostics | 0 | 0 |
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The measured run reduced token size by 14.3% and peak tracked memory by 9.8%.
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After the iterative compiler-hardening work on 2026-06-12, the same benchmark
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reported 13,222,443 peak bytes and 40,117 allocations. The reusable traversal
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stacks keep allocation count effectively unchanged from the interning baseline.
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After migrating persistent compiler references and spans to compact IDs on
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2026-06-12, the benchmark reported 8,651,659 peak bytes and 40,117 allocations.
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`Span` is 12 bytes and `Token` is 24 bytes; AST expressions, HIR expressions,
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and IR instructions are 64, 88, and 88 bytes respectively. These sizes are
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also printed by the benchmark to catch layout regressions.
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After pruning stale function specializations on 2026-06-12, peak memory
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remained 8,651,659 bytes and allocations fell to 30,121. Lookup-only
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specialization resolution avoids constructing temporary signatures for
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already discovered calls.
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