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James M Snell
e6c9c8eecd
createBatchEntry() and recordChunk() snapshot every chunk in a
seven-property `{ __proto__: null, ... }` literal, and every batch gets
a `{ __proto__: null, views, byteLength }` record. V8 creates such
literals in dictionary mode, which is expensive for objects created
for every chunk.
Create them with constructors whose prototype is an empty, frozen,
null-prototype object instead, as for IterResult. They have fast
properties and a single shape, and are only used internally.
Writing 1e6 16-byte chunks into a push() stream and reading them back
is about 6x faster with writeSync(), 3.7x faster with writevSync() (4
chunks per call) and 1.7x faster with string chunks.
benchmark/streams/iter-throughput-share-sync.js improves by 67-93%,
iter-throughput-share.js by 4-8%, and iter-throughput-broadcast.js
with 4 consumers by 8%. pipeTo() with small chunks is about 1.5x
faster.
Assisted-by: OpenCode
Signed-off-by: James M Snell <jasnell@gmail.com>
PR-URL: https://github.com/nodejs/node/pull/66648
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Gürgün Dayıoğlu <hey@gurgun.day>