Azeem Shaik
c6f3347870
# Objective Opening a diff against a heavily drifted branch sits on a spinner until every changed file has loaded. Blob reads were serialized through the git job queue and enqueued in `open_buffer` completion order rather than path order, so the blob for the first excerpt could be hundreds of jobs deep. ## Solution 1. `load_blob_content` skips the job queue — blobs are content-addressed, so the read doesn't depend on the status snapshot. 2. `DiffBuffer::load` is a lazy future instead of an eagerly-spawned `Task`, so the consumer picks the concurrency. 3. `DiffMultibuffer` drives those loads through `buffered(16)`. All three are needed: dropping the queue without bounding forks thousands of `cat-file` processes, and bounding without dropping it still serializes. Trust handling is unaffected, since the untrusted-repo flags are applied in `GitBinary::build_command` rather than by the queue. Worth noting that `handle_get_blob_content` is remote-reachable, so a guest can now put up to 16 `cat-file` processes on the host instead of queueing them. ## Testing Added `project_diff::tests::test_excerpts_are_ordered_by_path`, which pins excerpt order to `PathKey` rather than to load completion order, using more files than the concurrency limit and several executor seeds. Green: `cargo test -p git_ui --lib` (131), `cargo test -p project --lib git_store` (11), `./script/clippy`. Not tested against a remote or collab project, which is where the `handle_get_blob_content` change actually matters. ### Numbers Zed repo against a base ~3000 commits back: 2346 changed files, 1794 with a blob at the merge base. Warm cache, one `cat-file` process per blob, best of two runs at each concurrency. | concurrency | total | per blob | speedup | |---|---|---|---| | 1 (previous behaviour) | 77.25s | 43.1ms | 1.00x | | 2 | 17.74s | 9.9ms | 4.35x | | 4 | 10.05s | 5.6ms | 7.69x | | 8 | 7.34s | 4.1ms | 10.52x | | 16 (this change) | 6.63s | 3.7ms | 11.65x | | 32 | 6.59s | 3.7ms | 11.73x | | 64 | 7.14s | 4.0ms | 10.82x | 16 is where the curve flattens: 32 buys another 0.7% and 64 regresses, so there's nothing above it worth the extra in-flight buffers or the extra concurrent processes on a host serving a remote peer. At one blob at a time the first excerpt waits at an arbitrary position in a 1794-deep queue, so roughly 38s on average, which lines up with the 45s full load in the recording below. It's now in the first batch. ## Self-Review Checklist: - [x] I've reviewed my own diff for quality, security, and reliability - [x] Unsafe blocks (if any) have justifying comments — none added - [x] The content adheres to Zed's UI standards — no UI changes - [x] Tests cover the new/changed behavior - [x] Performance impact has been considered and is acceptable ## Showcase Opening a branch diff against a base ~3000 commits back, 2346 changed files. Both clips are cut to 15s to keep the file size down — the before run took 45s to finish loading. **Before** https://github.com/user-attachments/assets/d9475de8-ddd3-48a0-99e2-042a2f655b42 **After** https://github.com/user-attachments/assets/0bf0e73d-0fac-4c2a-9749-71fee376f260 --- Release Notes: - Improved how quickly a branch diff shows its first changes when the branch has drifted a long way from its base
Zed
Welcome to Zed, a high-performance, multiplayer code editor from the creators of Atom and Tree-sitter.
Installation
On macOS, Linux, and Windows you can download Zed directly or install Zed via your local package manager (macOS/Linux/Windows).
Other platforms are not yet available:
- Web (tracking discussion)
Developing Zed
Contributing
See CONTRIBUTING.md for ways you can contribute to Zed.
Also... we're hiring! Check out our jobs page for open roles.
Licensing
Zed source code is licensed primarily under GPL-3.0-or-later, with Apache-2.0 components where marked.
License information for third party dependencies must be correctly provided for CI to pass.
We use cargo-about to automatically comply with open source licenses. If CI is failing, check the following:
- Is it showing a
no license specifiederror for a crate you've created? If so, addpublish = falseunder[package]in your crate's Cargo.toml. - Is the error
failed to satisfy license requirementsfor a dependency? If so, first determine what license the project has and whether this system is sufficient to comply with this license's requirements. If you're unsure, ask a lawyer. Once you've verified that this system is acceptable add the license's SPDX identifier to theacceptedarray inscript/licenses/zed-licenses.toml. - Is
cargo-aboutunable to find the license for a dependency? If so, add a clarification field at the end ofscript/licenses/zed-licenses.toml, as specified in the cargo-about book.
Sponsorship
Zed is developed by Zed Industries, Inc., a for-profit company.
If you’d like to financially support the project, you can do so via GitHub Sponsors. Sponsorships go directly to Zed Industries and are used as general company revenue. There are no perks or entitlements associated with sponsorship.