50b9195882
First, we switch from a `BTreeSet` to a `HashSet` because clearing a `BTreeSet` will deallocate the btree's nodes but clearing a `HashSet` will not deallocate the backing hash table, saving the space to reuse for future insertions. Then, we reuse the same set (and therefore the same allocation) across every call to `can_optimize_var_lookup`. This results in a 1.22x to 1.32x speed up on various Sightglass benchmarks: ``` compilation :: nanoseconds :: benchmarks/pulldown-cmark/benchmark.wasm Δ = 39478181.76 ± 3441880.32 (confidence = 99%) main.so is 0.75x to 0.79x faster than reuse-set.so! reuse-set.so is 1.27x to 1.32x faster than main.so! [160128343 172174751.09 213325968] main.so [115055695 132696569.33 200782128] reuse-set.so compilation :: nanoseconds :: benchmarks/bz2/benchmark.wasm Δ = 22576954.88 ± 1830771.68 (confidence = 99%) main.so is 0.77x to 0.81x faster than reuse-set.so! reuse-set.so is 1.25x to 1.29x faster than main.so! [100449245 106820149.65 118628066] main.so [77039172 84243194.77 128168647] reuse-set.so compilation :: nanoseconds :: benchmarks/spidermonkey/benchmark.wasm Δ = 664533554.97 ± 22109170.05 (confidence = 99%) main.so is 0.81x to 0.82x faster than reuse-set.so! reuse-set.so is 1.22x to 1.23x faster than main.so! [3549762523 3640587103.35 3798662501] main.so [2793335181 2976053548.38 3192950484] reuse-set.so ```
wasmtime
A standalone runtime for WebAssembly
A Bytecode Alliance project
Guide | Contributing | Website | Chat
Installation
The Wasmtime CLI can be installed on Linux and macOS with a small install script:
curl https://wasmtime.dev/install.sh -sSf | bash
Windows or otherwise interested users can download installers and binaries directly from the GitHub Releases page.
Example
If you've got the Rust compiler installed then you can take some Rust source code:
fn main() {
println!("Hello, world!");
}
and compile/run it with:
$ rustup target add wasm32-wasi
$ rustc hello.rs --target wasm32-wasi
$ wasmtime hello.wasm
Hello, world!
Features
-
Fast. Wasmtime is built on the optimizing Cranelift code generator to quickly generate high-quality machine code either at runtime or ahead-of-time. Wasmtime's runtime is also optimized for cases such as efficient instantiation, low-overhead transitions between the embedder and wasm, and scalability of concurrent instances.
-
Secure. Wasmtime's development is strongly focused on the correctness of its implementation with 24/7 fuzzing donated by Google's OSS Fuzz, leveraging Rust's API and runtime safety guarantees, careful design of features and APIs through an RFC process, a security policy in place for when things go wrong, and a release policy for patching older versions as well. We follow best practices for defense-in-depth and known protections and mitigations for issues like Spectre. Finally, we're working to push the state-of-the-art by collaborating with academic researchers to formally verify critical parts of Wasmtime and Cranelift.
-
Configurable. Wastime supports a rich set of APIs and build time configuration to provide many options such as further means of restricting WebAssembly beyond its basic guarantees such as its CPU and Memory consumption. Wasmtime also runs in tiny environments all the way up to massive servers with many concurrent instances.
-
WASI. Wasmtime supports a rich set of APIs for interacting with the host environment through the WASI standard.
-
Standards Compliant. Wasmtime passes the official WebAssembly test suite, implements the official C API of wasm, and implements future proposals to WebAssembly as well. Wasmtime developers are intimately engaged with the WebAssembly standards process all along the way too.
Language Support
You can use Wasmtime from a variety of different languages through embeddings of the implementation:
- Rust - the
wasmtimecrate - C - the
wasm.h,wasi.h, andwasmtime.hheaders, CMake orwasmtimeConan package - C++ - the
wasmtime-cpprepository or usewasmtime-cppConan package - Python - the
wasmtimePyPI package - .NET - the
WasmtimeNuGet package - Go - the
wasmtime-gorepository
Documentation
📚 Read the Wasmtime guide here! 📚
The wasmtime guide is the best starting point to learn about what Wasmtime can do for you or help answer your questions about Wasmtime. If you're curious in contributing to Wasmtime, it can also help you do that!
It's Wasmtime.