PHP would serve WordPress when it's run as a standalone Wasm application.

WebAssembly brings true portability to the picture. You can build a binary once and run it everywhere.

Wasm container images are much smaller than the traditional ones. Even the alpine version of the php container is bigger than the Wasm one.

With WASI SDK we can build a Wasm module out of PHP's codebase, written in C. After that, it takes a very simple Dockerfile based on scratch for us to make an OCI image that can be run with Docker+Wasm.

Docker Desktop now includes support for WebAssembly. It is implemented with a containerd shim that can run Wasm applications using a Wasm runtime called WasmEdge. This means that instead of the typical Windows or Linux containers which would run a separate process from a binary in the container image, you can now run a Wasm application in the WasmEdge runtime, mimicking a container. As a result, the container image does not need to contain OS or runtime context for the running application - a single Wasm binary suffices.

We now have WebAssembly. Its technical features and portability make it possible to distribute the application, without requiring shipping OS-level dependencies and can run with strict security constraints.

If WASM+WASI existed in 2008, we wouldn't have needed to create Docker. That's how important it is. WebAssembly on the server is the future of computing.

There are Wasm runtimes that can run outside of the browser, including traditional operating systems such as Linux, Windows and macOS. Because they cannot rely on a JavaScript engine being available they communicate with the outside world using different interfaces, such as WASI, the WebAssembly System Interface. These runtimes allow Wasm applications to interact with their host system in a similar (but not quite the same) way as POSIX. Projects like WASI SDK and wasi-libc help people compile existing POSIX-compliant applications to WebAssembly.

Browser engines integrate a Wasm virtual machine, usually called a Wasm runtime, which can run the Wasm binary instructions. There are compiler toolchains (like Emscripten) that can compile source code to the Wasm target. This allows for legacy applications to be ported to a browser and directly communicate with the JS code that runs in client-side Web applications.

the new Docker+Wasm integration allows you to run a Wasm application alongside your Linux containers at much faster speed.

Docker Desktop and CLI can now manage both Linux containers and Wasm containers side by side.

infrastructure

除了上面介绍的，.wasm 文件还有其他部分，通常把它们叫做部件。一些部件对于模块来讲是必须的，一些是可选的。

Since it can only load and store numbers, it needs to call out to JavaScript code to do anything interesting (create DOM nodes, make network connections, etc.). WebAssembly code is still inside the browser sandbox and can only use the browser APIs that JavaScript has access to.

asm.js subset is basically JavaScript where you can only use numbers (no strings, objects, etc.). This is all you need to run C++ code since everything in C++ is either a number or a pointer to a number, and pointers are also numbers. The C++ address space is just a giant JavaScript array of numbers and pointers are just indices into that array.

Because our product is written in C++, which can easily be compiled into WebAssembly, Figma is a perfect demonstration of this new format’s power.

The problem is that it’s slow. WebAssembly doesn’t allow you to dynamically generate new machine code and run it from within pure Wasm code. This means you can’t use the JIT. You can only use the interpreter.

When running this small application with Wizer, it only takes .36 milliseconds (or 360 microseconds). This is more than 13 times faster than what we’d expect with the JS isolate approach. We get this fast start-up using something called a snapshot. Nick Fitzgerald explained all this in more detail in his WebAssembly Summit talk about Wizer.

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This is especially true for online gaming