[Turbopack] reduce the number of spans created in task completion

[sokra]

What?

Skip some methods for tasks without children.

Reduces number of spans created in tracing.

Closes PACK-3892

[sokra]

• [Turbopack] wait for output instead of waiting for task completion #75438
• [Turbopack] reduce the number of spans created in task completion #75437 👈 (View in Graphite)
• [Turbopack] setup aggregation number before connecting children #74910
• [Turbopack] connect children in a batch when task is about to finish #74773 : 1 other dependent PR (#75112 )
• [Turbopack] allow to manually mark tasks as root #75436
• [Turbopack] update event_listener to fix hanging bug #75481
• canary

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[ijjk]

Stats from current PR

Default Build

General

	vercel/next.js canary	vercel/next.js sokra/reduce-spans	Change
buildDuration	21.4s	19.6s	N/A
buildDurationCached	18.5s	15.5s	N/A
nodeModulesSize	392 MB	392 MB	✓
nextStartRea..uration (ms)	476ms	483ms	N/A

Client Bundles (main, webpack)

	vercel/next.js canary	vercel/next.js sokra/reduce-spans	Change
5306-HASH.js gzip	54 kB	54 kB	N/A
8276.HASH.js gzip	169 B	168 B	N/A
8377-HASH.js gzip	5.46 kB	5.46 kB	N/A
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main-HASH.js gzip	34.5 kB	34.5 kB	N/A
webpack-HASH.js gzip	1.71 kB	1.71 kB	N/A
Overall change	0 B	0 B	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	vercel/next.js sokra/reduce-spans	Change
polyfills-HASH.js gzip	39.4 kB	39.4 kB	✓
Overall change	39.4 kB	39.4 kB	✓

Client Pages

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amp-HASH.js gzip	512 B	510 B	N/A
css-HASH.js gzip	343 B	342 B	N/A
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edge-ssr-HASH.js gzip	265 B	265 B	✓
head-HASH.js gzip	363 B	362 B	N/A
hooks-HASH.js gzip	393 B	392 B	N/A
image-HASH.js gzip	4.59 kB	4.58 kB	N/A
index-HASH.js gzip	268 B	268 B	✓
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routerDirect..HASH.js gzip	328 B	328 B	✓
script-HASH.js gzip	397 B	397 B	✓
withRouter-HASH.js gzip	323 B	326 B	N/A
1afbb74e6ecf..834.css gzip	106 B	106 B	✓
Overall change	3.59 kB	3.59 kB	✓

Client Build Manifests

	vercel/next.js canary	vercel/next.js sokra/reduce-spans	Change
_buildManifest.js gzip	748 B	747 B	N/A
Overall change	0 B	0 B	✓

Rendered Page Sizes

	vercel/next.js canary	vercel/next.js sokra/reduce-spans	Change
index.html gzip	525 B	524 B	N/A
link.html gzip	539 B	538 B	N/A
withRouter.html gzip	520 B	520 B	✓
Overall change	520 B	520 B	✓

Edge SSR bundle Size

	vercel/next.js canary	vercel/next.js sokra/reduce-spans	Change
edge-ssr.js gzip	130 kB	130 kB	N/A
page.js gzip	210 kB	210 kB	N/A
Overall change	0 B	0 B	✓

Middleware size

	vercel/next.js canary	vercel/next.js sokra/reduce-spans	Change
middleware-b..fest.js gzip	676 B	670 B	N/A
middleware-r..fest.js gzip	155 B	156 B	N/A
middleware.js gzip	31.3 kB	31.3 kB	N/A
edge-runtime..pack.js gzip	844 B	844 B	✓
Overall change	844 B	844 B	✓

Next Runtimes

	vercel/next.js canary	vercel/next.js sokra/reduce-spans	Change
app-page-exp...dev.js gzip	385 kB	385 kB	✓
app-page-exp..prod.js gzip	132 kB	132 kB	✓
app-page-tur..prod.js gzip	145 kB	145 kB	✓
app-page-tur..prod.js gzip	141 kB	141 kB	✓
app-page.run...dev.js gzip	372 kB	372 kB	✓
app-page.run..prod.js gzip	128 kB	128 kB	✓
app-route-ex...dev.js gzip	39.3 kB	39.3 kB	✓
app-route-ex..prod.js gzip	25.6 kB	25.6 kB	✓
app-route-tu..prod.js gzip	25.6 kB	25.6 kB	✓
app-route-tu..prod.js gzip	25.4 kB	25.4 kB	✓
app-route.ru...dev.js gzip	40.8 kB	40.8 kB	✓
app-route.ru..prod.js gzip	25.4 kB	25.4 kB	✓
dist_client_...dev.js gzip	356 B	356 B	✓
dist_client_...dev.js gzip	349 B	349 B	✓
pages-api-tu..prod.js gzip	9.69 kB	9.69 kB	✓
pages-api.ru...dev.js gzip	11.8 kB	11.8 kB	✓
pages-api.ru..prod.js gzip	9.68 kB	9.68 kB	✓
pages-turbo...prod.js gzip	21.9 kB	21.9 kB	✓
pages.runtim...dev.js gzip	31.5 kB	31.5 kB	✓
pages.runtim..prod.js gzip	21.9 kB	21.9 kB	✓
server.runti..prod.js gzip	60.5 kB	60.5 kB	✓
Overall change	1.65 MB	1.65 MB	✓

build cache

	vercel/next.js canary	vercel/next.js sokra/reduce-spans	Change
0.pack gzip	2.1 MB	2.1 MB	N/A
index.pack gzip	75.9 kB	74.4 kB	N/A
Overall change	0 B	0 B	✓

Diff details

Diff for main-HASH.js

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Commit: b4afea2

[ijjk]

Tests Passed

[sokra]

Merge activity

• Feb 4, 8:36 PM EST: A user merged this pull request with Graphite.