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Faster completion support for remotes #17993

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maan2003
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@maan2003 maan2003 commented Sep 18, 2024

Before this change we canceled every completion task on each keystroke.
This works fine when the latency to the LSP is low, but on a remote that
may be a few hundred ms away, this means you are always having to wait
until the completions show.

This also help if language server takes a while to respond to completion requests.

Release Notes:

  • Improved perceived latency of completions over the network

ConradIrwin and others added 2 commits September 18, 2024 14:13
Before this change we cancled every completion task on each keystroke.
This works fine when the latency to the LSP is low, but on a remote that
may be a few hundred ms away, this means you are always having to wait
until the completions show.

Co-Authored-By: Maan2003 <[email protected]>
@cla-bot cla-bot bot added the cla-signed The user has signed the Contributor License Agreement label Sep 18, 2024
@maan2003
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supersedes #17954, so I can also push changes

Comment on lines 4345 to 4346
// the task didn't get cancelled, so we manually return
return;
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otherwise completions from this show sometimes after this.

@maan2003
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latency saved is time taken to type the last word before completion.

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maan2003 commented Sep 18, 2024

noticed that filtering completions can be really slow in some cases

from logs
[crates/editor/src/editor.rs:1360:9] start.elapsed() = 181.814619ms

and looks like filter is running multiple times per keystroke

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just dropping completions future doesn't cancel the request to remote server (tested in ssh case).

and rust analyzer sends huge completions response every time (~800KB) due to including docs.

this delays future responses because you have to wait for x * 800KB data to be received where x is number of keystrokes

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osiewicz commented Oct 2, 2024

just fyi @maan2003, @SomeoneToIgnore has recently landed a PR which significantly reduces the amount of data sent back by RA: rust-lang/rust-analyzer#18167

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maan2003 commented Oct 2, 2024

nice!

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This looks somewhat stale and outdates, so I'll close this to keep the PR queue cleaner.
Feel free to resubmit when ready.

@maan2003 maan2003 deleted the push-ulosmxvvopwv branch February 2, 2025 23:28
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4 participants