stream: skip idle webstreams start and watchers by mcollina · Pull Request #66424 · nodejs/node

mcollina · 2026-09-30T21:09:18Z

Round 21 of the webstreams performance work (follows #66392). It targets what a stream costs before its first chunk and after its last one: construction, tee() and pipeTo() setup and shutdown.

No post-start microtask for sources without `pull()`

setupReadableStreamDefaultController queued a microtask after every start() to flip the controller's started flag and call pull() if needed. That flag only gates calls into the pull algorithm, so for a source without pull() (push-style sources that enqueue from start(), or new ReadableStream()) the step has nothing observable left to do. The flag is now set synchronously in that case and no closure or task is allocated. Sources with pull() keep the microtask, at the same position. Byte streams get the same treatment.

This also stops a burst of short-lived streams from being kept alive until the next microtask checkpoint, which is where most of the time in the creation benchmark went.

Closed watchers as records instead of promises

pipeTo() holds the only references to its reader and writer, and tee() to its reader, so their [[closedPromise]] records are never observed as promises. Each pipe still materialized both records plus a reaction to watch for close and error, and each tee one record plus a reaction. The watchers are now installed as the records themselves (ClosedPromiseHook), the way the pipe's ready hook already worked: the settle sites resolve or reject the record where they would have settled the promise, and the hook enqueues the watcher at the microtask position its reaction would have had. The erroring and release paths probe the record's promise, so every hook carries one shared forever-pending promise, which setPromiseHandled() skips.

The tee's cancel promise is materialized by the first branch cancel only.

Tests

test/parallel/test-whatwg-readablestream-tee-cancel-settle.js covers the cancel promise settling before and after materialization (cancel one branch then close or error the source, close then cancel both, cancel both) and a tee of an already errored source, for default and byte streams.

A 53-scenario microtask-ordering stress (pull, push, iterators, tee incl. byte tee, pipeTo incl. every shutdown path, transform backpressure, ReadableStream.from, writers) logs identically against main, also with --no-async-context-frame. WPT streams and the webstreams parallel batch are green.

Benchmark

node benchmark/compare.js --runs 20 over benchmark/webstreams:

                                                                       confidence improvement accuracy (*)    (**)   (***)
webstreams/adapters.js kind='readable-from-web' n=100000                              -1.36 %       ±3.06%  ±4.09%  ±5.38%
webstreams/adapters.js kind='readable-to-web' n=100000                                -0.64 %       ±3.22%  ±4.32%  ±5.69%
webstreams/adapters.js kind='writable-from-web' n=100000                              -1.29 %       ±5.43%  ±7.29%  ±9.60%
webstreams/adapters.js kind='writable-to-web' n=100000                                -1.19 %       ±4.96%  ±6.70%  ±8.92%
webstreams/creation.js kind='ReadableStream.tee' n=50000                      ***     20.47 %       ±3.27%  ±4.39%  ±5.79%
webstreams/creation.js kind='ReadableStream' n=50000                          ***    172.40 %      ±14.62% ±19.68% ±26.07%
webstreams/creation.js kind='ReadableStreamBYOBReader' n=50000                ***     15.66 %       ±7.78% ±10.44% ±13.76%
webstreams/creation.js kind='ReadableStreamDefaultReader' n=50000             ***     14.53 %       ±5.73%  ±7.73% ±10.26%
webstreams/creation.js kind='TransformStream' n=50000                                  0.03 %       ±3.21%  ±4.30%  ±5.65%
webstreams/creation.js kind='WritableStream' n=50000                                   4.36 %       ±5.38%  ±7.24%  ±9.60%
webstreams/encoding-streams.js len=1024 kind='decode' n=100000                         3.12 %       ±3.96%  ±5.30%  ±6.97%
webstreams/encoding-streams.js len=1024 kind='encode' n=100000                         0.22 %       ±1.55%  ±2.07%  ±2.73%
webstreams/encoding-streams.js len=16 kind='decode' n=100000                          -1.41 %       ±3.78%  ±5.09%  ±6.75%
webstreams/encoding-streams.js len=16 kind='encode' n=100000                           1.70 %       ±2.27%  ±3.04%  ±4.00%
webstreams/from.js kind='async' n=1000000                                             -0.07 %       ±2.17%  ±2.90%  ±3.82%
webstreams/from.js kind='sync' n=1000000                                              -2.50 %       ±2.77%  ±3.72%  ±4.89%
webstreams/js_transfer.js n=10000 payload='ReadableStream'                            -0.80 %       ±2.08%  ±2.80%  ±3.72%
webstreams/js_transfer.js n=10000 payload='TransformStream'                            0.84 %       ±1.03%  ±1.38%  ±1.82%
webstreams/js_transfer.js n=10000 payload='WritableStream'                      *      1.74 %       ±1.44%  ±1.92%  ±2.53%
webstreams/lifecycle.js kind='async-iterator' n=50000                                  2.02 %       ±5.05%  ±6.76%  ±8.90%
webstreams/lifecycle.js kind='pipe-through' n=50000                                   -1.06 %       ±3.49%  ±4.68%  ±6.17%
webstreams/lifecycle.js kind='pipe-to' n=50000                                         8.60 %      ±10.55% ±14.13% ±18.58%
webstreams/lifecycle.js kind='readable' n=50000                                       -1.55 %       ±3.15%  ±4.22%  ±5.55%
webstreams/pipe-through.js kind='default' n=500000                                     2.93 %       ±3.31%  ±4.44%  ±5.87%
webstreams/pipe-through.js kind='transform' n=500000                                  -1.88 %       ±2.63%  ±3.54%  ±4.70%
webstreams/pipe-to.js highWaterMarkW=1 highWaterMarkR=1 n=500000                       0.58 %       ±3.34%  ±4.48%  ±5.90%
webstreams/pipe-to.js highWaterMarkW=1 highWaterMarkR=1024 n=500000                    1.08 %       ±2.26%  ±3.03%  ±3.99%
webstreams/pipe-to.js highWaterMarkW=1 highWaterMarkR=4096 n=500000                   -1.24 %       ±1.64%  ±2.20%  ±2.90%
webstreams/pipe-to.js highWaterMarkW=1024 highWaterMarkR=1 n=500000                   -0.66 %       ±2.30%  ±3.09%  ±4.08%
webstreams/pipe-to.js highWaterMarkW=1024 highWaterMarkR=1024 n=500000                 0.60 %       ±2.39%  ±3.21%  ±4.23%
webstreams/pipe-to.js highWaterMarkW=1024 highWaterMarkR=4096 n=500000                -0.31 %       ±2.10%  ±2.81%  ±3.70%
webstreams/pipe-to.js highWaterMarkW=4096 highWaterMarkR=1 n=500000                   -0.67 %       ±2.09%  ±2.80%  ±3.68%
webstreams/pipe-to.js highWaterMarkW=4096 highWaterMarkR=1024 n=500000                -0.77 %       ±2.80%  ±3.76%  ±4.96%
webstreams/pipe-to.js highWaterMarkW=4096 highWaterMarkR=4096 n=500000                -1.60 %       ±2.47%  ±3.31%  ±4.37%
webstreams/readable-async-iterator.js type='bytes' n=100000                            1.17 %       ±2.53%  ±3.39%  ±4.46%
webstreams/readable-async-iterator.js type='normal' n=100000                           1.62 %       ±5.17%  ±6.94%  ±9.16%
webstreams/readable-read-buffered.js bufferSize=1 n=100000                             0.09 %       ±5.16%  ±6.92%  ±9.13%
webstreams/readable-read-buffered.js bufferSize=10 n=100000                            2.98 %       ±4.40%  ±5.90%  ±7.79%
webstreams/readable-read-buffered.js bufferSize=100 n=100000                          -1.04 %       ±4.42%  ±5.93%  ±7.80%
webstreams/readable-read-buffered.js bufferSize=1000 n=100000                          6.55 %       ±7.43%  ±9.97% ±13.15%
webstreams/readable-read.js type='byob' n=100000                                       0.18 %       ±1.34%  ±1.79%  ±2.35%
webstreams/readable-read.js type='normal' n=100000                                    -1.02 %       ±4.63%  ±6.21%  ±8.17%
webstreams/tee.js type='bytes' n=100000                                               -0.89 %       ±2.04%  ±2.73%  ±3.61%
webstreams/tee.js type='normal' n=100000                                               0.20 %       ±2.22%  ±2.97%  ±3.91%
webstreams/writable-write.js type='await' n=100000                                     2.10 %       ±2.82%  ±3.80%  ±5.03%
webstreams/writable-write.js type='queued' n=100000                                    1.90 %       ±2.45%  ±3.31%  ±4.41%

The lifecycle.js rows re-run with 40 samples, since the pipe-to row has a wide interval:

                                                      confidence improvement accuracy (*)   (**)   (***)
webstreams/lifecycle.js kind='async-iterator' n=50000                 0.77 %       ±3.42% ±4.54%  ±5.88%
webstreams/lifecycle.js kind='pipe-through' n=50000                   1.56 %       ±2.91% ±3.86%  ±5.00%
webstreams/lifecycle.js kind='pipe-to' n=50000                **     10.98 %       ±7.03% ±9.33% ±12.09%
webstreams/lifecycle.js kind='readable' n=50000                      -0.67 %       ±2.13% ±2.83%  ±3.67%

The long-running rows (pipe-to, pipe-through, tee, read, from) are flat as expected: the savings are per stream, per pipe and per tee, not per chunk. A local harness that creates and drains a 4-chunk push-style stream measured +22 %, and a 4-chunk pipe +10 %.

AI generated, humanly reviewed.

nodejs-github-bot · 2026-09-30T21:09:23Z

Review requested:

@nodejs/performance

codecov · 2026-10-02T09:48:13Z

Codecov Report

❌ Patch coverage is 98.30508% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.41%. Comparing base (9a85290) to head (9605461).
⚠️ Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/internal/webstreams/readablestream.js	98.19%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##             main   #66424    +/-   ##
========================================
  Coverage   90.40%   90.41%            
========================================
  Files         791      791            
  Lines      276120   276496   +376     
  Branches    53032    53099    +67     
========================================
+ Hits       249634   249995   +361     
- Misses      16896    16902     +6     
- Partials     9590     9599     +9

Files with missing lines	Coverage Δ
lib/internal/webstreams/util.js	`97.13% <100.00%> (+0.06%)`	⬆️
lib/internal/webstreams/readablestream.js	`98.10% <98.19%> (+0.02%)`	⬆️

... and 30 files with indirect coverage changes

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gurgunday

lgtm

nodejs-github-bot · 2026-10-03T14:48:50Z

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github-actions · 2026-10-04T07:20:37Z

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github-actions · 2026-10-06T03:31:20Z

This pull request has conflicts with its base branch, removing the author ready label.
Please rebase your branch onto the latest base branch, resolve the conflicts locally, and force-push.
Afterwards the pull request needs a fresh collaborator approval, and a collaborator will add the label back once it is author ready again.

A source without pull() has nothing observable left to do in its post-start step, since the started flag only gates calls into the pull algorithm. Set the flag right away instead of from a microtask, so a push-style ReadableStream allocates neither the closure nor the task and is not kept alive until the next microtask checkpoint. pipeTo and tee hold the only references to their reader and writer, so their [[closedPromise]] records are never observed as promises. Install the watchers as the records themselves, as pipeTo's ready hook already does, instead of materializing a promise plus reaction per side, and hand the erroring/release probes one shared pending promise. The tee's cancel promise is likewise materialized by the first branch cancel. Microtask ordering is unchanged: each hook enqueues its watcher at the position the promise reaction would have had. node benchmark/compare.js --runs 20 over benchmark/webstreams (46 rows, all others within the confidence interval): webstreams/creation.js kind='ReadableStream' *** +172.40% webstreams/creation.js kind='ReadableStream.tee' *** +20.47% webstreams/creation.js kind='ReadableStreamBYOBReader' *** +15.66% webstreams/creation.js kind='ReadableStreamDefaultReader' *** +14.53% webstreams/lifecycle.js kind='pipe-to' (40 runs) ** +10.98% Signed-off-by: Matteo Collina <hello@matteocollina.com>

nodejs-github-bot · 2026-10-07T04:51:25Z

CI: https://ci.nodejs.org/job/node-test-pull-request/78234/

github-actions · 2026-10-07T08:13:45Z

Benchmark GHA (webstreams): https://github.com/nodejs/node/actions/runs/37592351706

Results

[!WARNING]
Do not take GHA benchmark results as face value, always confirm them
using a dedicated machine, e.g. Jenkins CI.

Benchmark results:

                                                                       confidence improvement accuracy (*)    (**)   (***)
webstreams/adapters.js kind='readable-from-web' n=100000                              -0.58 %       ±6.87%  ±9.06% ±11.62%
webstreams/adapters.js kind='readable-to-web' n=100000                                 2.35 %      ±11.71% ±15.44% ±19.81%
webstreams/adapters.js kind='writable-from-web' n=100000                               0.38 %       ±6.15%  ±8.11% ±10.41%
webstreams/adapters.js kind='writable-to-web' n=100000                                 1.72 %       ±7.14%  ±9.41% ±12.08%
webstreams/creation.js kind='ReadableStream.tee' n=50000                      ***     21.79 %       ±6.64%  ±8.76% ±11.24%
webstreams/creation.js kind='ReadableStream' n=50000                          ***    185.00 %      ±12.67% ±16.73% ±21.54%
webstreams/creation.js kind='ReadableStreamBYOBReader' n=50000                ***     11.33 %       ±5.71%  ±7.52%  ±9.66%
webstreams/creation.js kind='ReadableStreamDefaultReader' n=50000             ***     16.37 %       ±6.48%  ±8.55% ±10.97%
webstreams/creation.js kind='TransformStream' n=50000                                  4.05 %       ±6.10%  ±8.04% ±10.32%
webstreams/creation.js kind='WritableStream' n=50000                                  -0.05 %       ±5.08%  ±6.69%  ±8.59%
webstreams/encoding-streams.js len=1024 kind='decode' n=100000                         0.38 %       ±6.15%  ±8.10% ±10.40%
webstreams/encoding-streams.js len=1024 kind='encode' n=100000                        -2.04 %       ±9.89% ±13.03% ±16.72%
webstreams/encoding-streams.js len=16 kind='decode' n=100000                          -0.40 %       ±6.96%  ±9.18% ±11.77%
webstreams/encoding-streams.js len=16 kind='encode' n=100000                          -0.29 %       ±7.16%  ±9.44% ±12.11%
webstreams/from.js kind='async' n=1000000                                              0.34 %       ±4.36%  ±5.75%  ±7.38%
webstreams/from.js kind='sync' n=1000000                                               0.61 %       ±4.70%  ±6.20%  ±7.95%
webstreams/js_transfer.js n=10000 payload='ReadableStream'                            -1.28 %       ±9.35% ±12.33% ±15.82%
webstreams/js_transfer.js n=10000 payload='TransformStream'                           -0.18 %       ±8.69% ±11.46% ±14.71%
webstreams/js_transfer.js n=10000 payload='WritableStream'                             2.37 %       ±9.20% ±12.13% ±15.56%
webstreams/lifecycle.js kind='async-iterator' n=50000                                  1.26 %       ±5.00%  ±6.60%  ±8.46%
webstreams/lifecycle.js kind='pipe-through' n=50000                                    3.38 %       ±4.89%  ±6.45%  ±8.27%
webstreams/lifecycle.js kind='pipe-to' n=50000                                         4.02 %       ±6.22%  ±8.20% ±10.52%
webstreams/lifecycle.js kind='readable' n=50000                                        0.42 %       ±3.93%  ±5.18%  ±6.65%
webstreams/pipe-through.js kind='default' n=500000                                     0.25 %       ±5.50%  ±7.25%  ±9.30%
webstreams/pipe-through.js kind='transform' n=500000                                   0.33 %       ±5.30%  ±6.99%  ±8.97%
webstreams/pipe-to.js highWaterMarkW=1 highWaterMarkR=1 n=500000                       0.99 %       ±5.76%  ±7.60%  ±9.75%
webstreams/pipe-to.js highWaterMarkW=1 highWaterMarkR=1024 n=500000                   -0.89 %       ±5.44%  ±7.17%  ±9.20%
webstreams/pipe-to.js highWaterMarkW=1 highWaterMarkR=4096 n=500000                   -0.44 %       ±5.60%  ±7.38%  ±9.47%
webstreams/pipe-to.js highWaterMarkW=1024 highWaterMarkR=1 n=500000                   -0.40 %       ±5.26%  ±6.94%  ±8.90%
webstreams/pipe-to.js highWaterMarkW=1024 highWaterMarkR=1024 n=500000                -0.94 %       ±5.53%  ±7.29%  ±9.36%
webstreams/pipe-to.js highWaterMarkW=1024 highWaterMarkR=4096 n=500000                -1.55 %       ±5.31%  ±7.00%  ±8.98%
webstreams/pipe-to.js highWaterMarkW=4096 highWaterMarkR=1 n=500000                    1.35 %       ±5.36%  ±7.07%  ±9.07%
webstreams/pipe-to.js highWaterMarkW=4096 highWaterMarkR=1024 n=500000                 0.40 %       ±5.37%  ±7.08%  ±9.08%
webstreams/pipe-to.js highWaterMarkW=4096 highWaterMarkR=4096 n=500000                -1.26 %       ±5.47%  ±7.21%  ±9.25%
webstreams/readable-async-iterator.js type='bytes' n=100000                           -1.24 %      ±12.65% ±16.67% ±21.39%
webstreams/readable-async-iterator.js type='normal' n=100000                          -1.13 %       ±7.68% ±10.12% ±12.99%
webstreams/readable-read-buffered.js bufferSize=1 n=100000                             2.39 %       ±6.15%  ±8.10% ±10.40%
webstreams/readable-read-buffered.js bufferSize=10 n=100000                            0.32 %       ±6.31%  ±8.31% ±10.67%
webstreams/readable-read-buffered.js bufferSize=100 n=100000                          -0.86 %       ±6.21%  ±8.19% ±10.51%
webstreams/readable-read-buffered.js bufferSize=1000 n=100000                          0.39 %       ±6.18%  ±8.15% ±10.46%
webstreams/readable-read.js type='byob' n=100000                                      -0.01 %      ±12.69% ±16.73% ±21.47%
webstreams/readable-read.js type='normal' n=100000                                     0.61 %       ±5.30%  ±6.98%  ±8.96%
webstreams/tee.js type='bytes' n=100000                                               -2.50 %       ±9.08% ±11.97% ±15.36%
webstreams/tee.js type='normal' n=100000                                               0.04 %       ±5.77%  ±7.61%  ±9.76%
webstreams/writable-write.js type='await' n=100000                                    -2.18 %       ±6.02%  ±7.93% ±10.18%
webstreams/writable-write.js type='queued' n=100000                                    0.34 %       ±8.32% ±10.96% ±14.07%

Be aware that when doing many comparisons the risk of a false-positive
result increases. In this case, there are 46 comparisons, you can thus
expect the following amount of false-positive results:
  2.30 false positives, when considering a   5% risk acceptance (*, **, ***),
  0.46 false positives, when considering a   1% risk acceptance (**, ***),
  0.05 false positives, when considering a 0.1% risk acceptance (***)

[!WARNING]
Do not take GHA benchmark results as face value, always confirm them
using a dedicated machine, e.g. Jenkins CI.

nodejs-github-bot · 2026-10-07T08:39:12Z

CI: https://ci.nodejs.org/job/node-test-pull-request/78236/

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stream: skip idle webstreams start and watchers - #66424

stream: skip idle webstreams start and watchers#66424
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mcollina commented Sep 30, 2026

No post-start microtask for sources without pull()

Closed watchers as records instead of promises

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No post-start microtask for sources without `pull()`

nodejs-github-bot commented Sep 30, 2026 •

edited by gurgunday

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codecov Bot commented Oct 2, 2026 •

edited

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github-actions Bot commented Oct 7, 2026 •

edited

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