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perf(native): stop using page_allocator for short-lived allocations - #10612
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…allocator The pubkeys binding used page_allocator for everything, so every per-call scratch allocation (path strings, aggregate indices, syncPubkeys pointer arrays) cost an mmap/munmap and at least one page. Keep page_allocator only for the long-lived cache storage, including pkix.load, whose result is swapped into the live cache by pkix.install. Route binding scratch through c_allocator. PubkeyCache.syncPubkeys now takes a scratch allocator for its prepared keys and batch error slots instead of borrowing the cache allocator.
The function hardcoded page_allocator. Take the allocator from the caller instead; Writer.writeState already has one.
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| /// Populate the cache from the missing suffix of a validator list. Existing | ||
| /// entries are trusted as the application's unforkable singleton history. | ||
| /// `allocator` backs per-call scratch only; cache storage stays on the cache allocator. |
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we dont call cache allocator at all here so this seems redundant
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Removed in 05fc2c9. Small note: syncPubkeys does still grow the map through the cache allocator (ensureTotalCapacityAmortizedUnlocked), but the param already reads clearly without the doc line.
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**Motivation** zapi 4.4.0 includes ChainSafe/zapi#92: the shared `std.Io.Threaded` behind `js.io()` now allocates its `async`/`concurrent`/group task closures with `c_allocator` instead of `page_allocator`, so each task no longer costs an mmap/munmap pair. Follow-up to #10612. **Description** - Pin zapi to the `zapi-v4.4.0` tag commit `0cc6b2c`. - zapi 4.2.0 renamed `Number.toU64Exact` to `toSafeInteger` (ChainSafe/zapi#81) with unchanged semantics. Update the binding call sites. Other changes since the previous pin (4.1.0) are additive (`js.scratch()`, exact BigInt conversions). 4.2.0 also requires `setEnv`/`restoreEnv` to be paired; lodestar does not call them directly. **Testing** - `zig build test:tidy`, bindings build - `pnpm --filter @lodestar/native prepare-mainnet` and the full binding test suite: 26 files passed, 1 skipped (506 tests passed, 11 skipped) > This PR was written primarily by Claude Code.
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Motivation
std.heap.page_allocatormaps at least one page per allocation and unmaps it on free, with no reuse. It fits large, long-lived buffers, but a few places in the Zig code use it for small per-call allocations.Description
bindings/napi/pubkeys.zig: keeppage_allocatorfor the long-lived pubkey cache storage, includingpkix.load, sincepkix.installswaps the loaded storage and its allocator into the live cache. Per-call allocations (path strings, aggregate indices,syncPubkeyspointer arrays) now usec_allocator.PubkeyCache.syncPubkeystakes a scratch allocator for itspreparedandbatch_errorsarrays instead of borrowing the cache allocator.era.getShortEraRoottakes an allocator from the caller instead of hardcodingpage_allocator.The same issue in zapi's shared
std.Io.Threaded(which allocates everyasync/concurrent/group task closure through its gpa) is fixed in ChainSafe/zapi#92. The zapi bump to 4.4.0 will land in a separate PR.Testing
zig build test:state_transition test:era test:tidypnpm --filter @lodestar/native prepare-mainnet, then binding testspubkeys,rewards,proposerRewards,attestationRewards