Pass viewer context always non-mutable #4438
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Wumpf
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📺 re_viewer
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Dec 11, 2023
### What * Fixes #1325 Two levels of parallism actually: * All context & part systems for a single space view each run in parallel * All space views now in parallel first setup their query and then kick of their (parallized!) system execution This gives us major speedups whenever: * There is several heavy systems in a scene (e.g. a lot of points and a lot of arrows) * There is several space views As such this is a very fundamental & widely applicable parallelization!  (a rather silly "points with arrows" scene duplicated a bunch of times. Note that we still don't have any caching, so all these space views might as well be animated individually!) <img width="1421" alt="image" src="https://github.com/rerun-io/rerun/assets/1220815/57e13e15-9d8f-4a30-bf74-d8174676986d"> (busy rayon worker threads!) Related things that are not parallel yet: * ui methods per space view (run one by one) * draw call recording (done as part of the ui method, but we could likely do this in parallel, only joining on these tasks when egui wants to queue up the command buffers) * processing _within_ a system depends on the system at hand. Today, only point cloud has some parallization ### Checklist * [x] I have read and agree to [Contributor Guide](https://github.com/rerun-io/rerun/blob/main/CONTRIBUTING.md) and the [Code of Conduct](https://github.com/rerun-io/rerun/blob/main/CODE_OF_CONDUCT.md) * [x] I've included a screenshot or gif (if applicable) * [x] I have tested the web demo (if applicable): * Full build: [app.rerun.io](https://app.rerun.io/pr/4460/index.html) * Partial build: [app.rerun.io](https://app.rerun.io/pr/4460/index.html?manifest_url=https://app.rerun.io/version/nightly/examples_manifest.json) - Useful for quick testing when changes do not affect examples in any way * [x] The PR title and labels are set such as to maximize their usefulness for the next release's CHANGELOG - [PR Build Summary](https://build.rerun.io/pr/4460) - [Docs preview](https://rerun.io/preview/cb7e9a9902bb9923ade41271ccc43ed01a2a4d33/docs) <!--DOCS-PREVIEW--> - [Examples preview](https://rerun.io/preview/cb7e9a9902bb9923ade41271ccc43ed01a2a4d33/examples) <!--EXAMPLES-PREVIEW--> - [Recent benchmark results](https://build.rerun.io/graphs/crates.html) - [Wasm size tracking](https://build.rerun.io/graphs/sizes.html) --- End of a series on refactors leading to this parallization: * #4387 * #4404 * #4389 * #4421 * #4422 * #4430 * #4438 * #4460 --------- Co-authored-by: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>
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What
What it says on the tin!
No additional review required, just waiting for rust ci to be sure :)
Checklist
Part of series towards more multithreading in the viewer!