* [monorepo] reduce writes from chrome in cypress
Chrome puts its shared memory in /dev/shm, and docker's default 64MB is far
too small for it - which is why Cypress passes --disable-dev-shm-usage,
spilling those segments to files on the container's writable layer instead.
Under one spec that is a few hundred MB of write-then-delete churn; under the
CI fan-out it was most of the disk bandwidth on the whole box.
So every service built from dockerfiles/cypress gets shm_size 1gb and every
cypress config drops the flag again: the SaaS e2e service, web's CI and local
component-test services plus its standalone cypress one, and server-ce's e2e
and native cypress services. Both e2e-open variants inherit the setting
through `extends`; the native one is a service of its own, and would be left
running Chrome against 64MB once the flag is gone.
* [monorepo] adopt cypress-pnp-reporter
Materializing the reporter packages copied 267 packages / 3779 files
(59MB) into /tmp on every container start, once per spec. Resolving them
through PnP inside Cypress's Electron process instead drops that to
zero: the entrypoint shell went from 55.6MB of write_bytes to 0.
* [web] serve built assets from a prepared buffer between builds
Serving a chunk cost ~2ms whatever its size, and an editor page pulls ~144
of them, so webpack-dev-server burned 2-3 cores through an e2e run purely
answering requests for output that had not changed since the last build.
It is not bytes: cutting the bundle 2.6x with a cheaper devtool moved CPU
by 8%, and an empty 304 cost nearly as much as the full body. It is the
per-request work - reading the asset out of the in-memory filesystem and
re-hashing the whole body for a strong ETag, on every request.
Three things a build does that this has to respect, each found by tracing
the hooks rather than by reading them:
- `done` fires twice per build, for the compilation and for the manifest,
both with the same hash. A flag would have been cleared by the second
while the first was still running, so the gate is a counter.
- An incremental `done` reports only the assets it rewrote - 16, not 630 -
so asset names accumulate. Resetting them on `invalid` left the
manifest's two behind and nothing was served from here again.
- webpack-dev-middleware holds requests during a rebuild. This sits in
front of it, so it steps aside for that window and drops the cache when
a rebuild starts. Whether a response can be kept is then decided as it
ends rather than as it began: an epoch bumped on `invalid` names the
build its bytes were read from, and only a response from the current
build with no rebuild in flight is stored. A rebuild starting
mid-response can no longer write the previous build's bytes in behind
the cache being dropped, which eviction by asset name could not catch
anyway - an incremental build does not name the assets it left alone.
Measured on the editor entrypoint, 16 concurrent clients:
0.26-0.31s -> 0.045-0.050s of webpack CPU per page load, and 0.0455s
immediately after a rebuild. Same chunk graph, byte-identical output.
GitOrigin-RevId: 08b4ab2d665414069bc01b4763dd64faa9b4e5cb
* Update Copybara options in preparation for open-sourcing the source editor
* Move files
* Update paths
* Remove source-editor module and checks for its existence
* Explicitly mention CM6 license in files that contain code adapted from CM6
GitOrigin-RevId: 89b7cc2b409db01ad103198ccbd1b126ab56349b
Jakob Ackermann