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The goal of this new benchmark, `call`, is to help us measure the overhead of both calling into WebAssembly from the host as well as calling the host from WebAssembly. There's lots of various ways to measure this so this benchmark is a bit large but should hopefully be pretty thorough. It's expected that this benchmark will rarely be run in its entirety but rather only a subset of the benchmarks will be run at any one given time. Some metrics measured here are: * Typed vs Untyped vs Unchecked - testing the cost of both calling wasm with these various methods as well as having wasm call the host where the host function is defined with these various methods. * With and without `call_hook` - helps to measure the overhead of the `Store::call_hook` API. * Synchronous and Asynchronous - measures the overhead of calling into WebAssembly asynchronously (with and without the pooling allocator) in addition to defining host APIs in various methods when wasm is called asynchronously. Currently all the numbers are as expected, notably: * Host calling WebAssembly is ~25ns of overhead * WebAssembly calling the host is ~3ns of overhead * "Unchecked" is a bit slower than "typed", and "Untyped" is slower than unchecked. * Asynchronous wasm calling a synchronous host function has ~3ns of overhead (nothing more than usual). * Asynchronous calls are much slower, on the order of 2-3us due to `madvise`. Lots of other fiddly bits that can be measured here, but this will hopefully help establish a benchmark through which we can measure in the future in addition to measuring changes such as #3876
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
-
Lightweight. Wasmtime is a standalone runtime for WebAssembly that scales with your needs. It fits on tiny chips as well as makes use of huge servers. Wasmtime can be embedded into almost any application too.
-
Fast. Wasmtime is built on the optimizing Cranelift code generator to quickly generate high-quality machine code at runtime.
-
Configurable. Whether you need to precompile your wasm ahead of time, or interpret it at runtime, Wasmtime has you covered for all your wasm-executing needs.
-
WASI. Wasmtime supports a rich set of APIs for interacting with the host environment through the WASI standard.
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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 or usewasmtimeConan 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.