a2a537e196
Fixes #23053. Two small bugs here: - the existing condition for printing out the group header was broken. it worked in the reproducer (in the issue above) without filtering only by accident, due to setting `self.has_ungrouped = true` once we see the warmup bench. Knowing that we sort benchmarks to put ungrouped benches first, there are only two cases: 1) we are starting the first group 2) we are ending the previous group and starting a new group - when you passed `--filter` we were applying that filter to the warmup bench (which is not visible to users), so we suffered from jit bias if you were filtering (unless your filter was `<warmup>`) TLDR; Running ```bash deno bench main.js --filter="G" ``` ```js // main.js Deno.bench({ group: "G1", name: "G1-A", fn() {}, }); Deno.bench({ group: "G1", name: "G1-B", fn() {}, }); ``` Before this PR: ``` benchmark time (avg) iter/s (min … max) p75 p99 p995 --------------------------------------------------------------- ----------------------------- G1-A 303.52 ps/iter3,294,726,102.1 (254.2 ps … 7.8 ns) 287.5 ps 391.7 ps 437.5 ps G1-B 3.8 ns/iter 263,360,635.9 (2.24 ns … 8.36 ns) 3.84 ns 4.73 ns 4.94 ns summary G1-A 12.51x faster than G1-B ``` After this PR: ``` benchmark time (avg) iter/s (min … max) p75 p99 p995 --------------------------------------------------------------- ----------------------------- group G1 G1-A 3.85 ns/iter 259,822,096.0 (2.42 ns … 9.03 ns) 3.83 ns 4.62 ns 4.83 ns G1-B 3.84 ns/iter 260,458,274.5 (3.55 ns … 7.05 ns) 3.83 ns 4.45 ns 4.7 ns summary G1-B 1x faster than G1-A ``` |
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| .cargo | ||
| .devcontainer | ||
| .github | ||
| bench_util | ||
| cli | ||
| ext | ||
| runtime | ||
| tests | ||
| tools | ||
| .dlint.json | ||
| .dprint.json | ||
| .editorconfig | ||
| .gitattributes | ||
| .gitignore | ||
| .gitmodules | ||
| .rustfmt.toml | ||
| Cargo.lock | ||
| Cargo.toml | ||
| LICENSE.md | ||
| README.md | ||
| Releases.md | ||
| rust-toolchain.toml | ||
Deno
Deno
(/ˈdiːnoʊ/, pronounced
dee-no) is a JavaScript, TypeScript, and WebAssembly runtime with secure
defaults and a great developer experience. It's built on V8,
Rust, and Tokio.
Learn more about the Deno runtime in the documentation.
Installation
Install the Deno runtime on your system using one of the commands below. Note that there are a number of ways to install Deno - a comprehensive list of installation options can be found here.
Shell (Mac, Linux):
curl -fsSL https://deno.land/install.sh | sh
PowerShell (Windows):
irm https://deno.land/install.ps1 | iex
Homebrew (Mac):
brew install deno
Chocolatey (Windows):
choco install deno
Build and install from source
Complete instructions for building Deno from source can be found in the manual here.
Your first Deno program
Deno can be used for many different applications, but is most commonly used to
build web servers. Create a file called server.ts and include the following
TypeScript code:
Deno.serve((_req: Request) => {
return new Response("Hello, world!");
});
Run your server with the following command:
deno run --allow-net server.ts
This should start a local web server on http://localhost:8000.
Learn more about writing and running Deno programs in the docs.
Additional resources
- Deno Docs: official guides and reference docs for the Deno runtime, Deno Deploy, and beyond.
- Deno Standard Library: officially supported common utilities for Deno programs.
- deno.land/x: registry for third-party Deno modules.
- Developer Blog: Product updates, tutorials, and more from the Deno team.
Contributing
We appreciate your help! To contribute, please read our contributing instructions.