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Buffer Wasm metadata reads

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udo
2026-07-19 06:43:19 +00:00
parent a9e24cffc4
commit 15fdfe725d
6 changed files with 182 additions and 40 deletions
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site/doc/pages/request_perf.txt
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@@ -19,7 +19,7 @@ Entry readiness reports inclusive `ready_freshness_us` plus `ready_source_genera
Successful first loads within the request are counted by `unit_load_count` and divided into `unit_module_us`, `unit_allocate_us`, `unit_import_us`, `unit_instantiate_us`, and `unit_initialize_us`. These cover compiled-module lookup, guest memory/table allocation, import construction, Wasmtime instantiation, and relocations/constructors/request binding. `entry_unit_load_count` and `entry_unit_materialize_us` isolate the initial page/CLI unit; `dynamic_include_load_count` and `dynamic_include_materialize_us` isolate side units first requested through `component()`. The per-unit bounded list adds `kind` (`entry` or `component`) and `materialize_us`, the inclusive host-side time from module acquisition through request binding. Repeated handlers from an already loaded unit are excluded.
`unit_module_cache_hit_count` and `unit_module_cache_miss_count` divide module loads by the worker's compiled-module cache. A miss is further identified by `unit_module_serialized_cache_hit_count` when Wasmtime deserializes the current `.cwasm`; `unit_module_compile_count` means it fell back to compiling the `.wasm`. `unit_module_lookup_us`, `unit_module_read_us`, `unit_module_read_bytes`, `unit_module_parse_us`, `unit_module_compile_us`, and `unit_module_classify_us` divide `unit_module_us` into artifact stat/cache lookup, wasm metadata/full-artifact read volume, custom-section parse, deserialize-or-compile, and immutable import classification. A current serialized-module hit scans only section headers and the `dylink.0`/`uce.abi` payloads; compilation fallback reads the complete wasm. The phase sum can be below the total because allocation and cache publication overhead remain in the aggregate.
`unit_module_cache_hit_count` and `unit_module_cache_miss_count` divide module loads by the worker's compiled-module cache. A miss is further identified by `unit_module_serialized_cache_hit_count` when Wasmtime deserializes the current `.cwasm`; `unit_module_compile_count` means it fell back to compiling the `.wasm`. `unit_module_lookup_us`, `unit_module_read_us`, `unit_module_read_bytes`, `unit_module_read_count`, `unit_module_parse_us`, `unit_module_compile_us`, and `unit_module_classify_us` divide `unit_module_us` into artifact stat/cache lookup, wasm metadata/full-artifact read volume, positional metadata reads, custom-section parse, deserialize-or-compile, and immutable import classification. Per-unit `unit_module_operations` expose the same `read_count`. On a serialized-module hit, `read_bytes` is the physical bounded read-ahead volume rather than only the logical selected bytes. The scanner skips code/data bodies and retains only section headers plus `dylink.0`, `uce.abi`, and `uce.module`; compilation fallback reads the complete wasm and does not use positional metadata reads. The phase sum can be below the total because allocation and cache publication overhead remain in the aggregate.
`unit_symbol_resolve_count` and `unit_symbol_resolve_us` isolate function and data symbol lookup within `unit_import_us`. The remainder of import time covers import-vector construction, Wasmtime Globals, GOT function table placement, and related bindings.