WebAssembly, Bytecode VMs, and Sandboxed Portable Runtimes: Stack vs Register VMs, Tiered JIT Compilation, Wasm Component Model, WASI, and Software Fault Isolation

Deep End Era. Engineering with Sankalp · Oct 29, 2026 · 1h 10m

How do you run untrusted third-party code written in Rust, Go, C++, or Python inside your server in fifty microseconds with zero risk of it reading your host memory or opening unauthorized sockets? We go inside Stack vs Register Bytecode VMs, Tiered JIT Compilers and Deoptimization, WebAssembly's single-pass structured verification, Wasmtime's 4 GiB Guard-Page Software Fault Isolation, and the Wasm Component Model and WASI 0.2/0.3.

Chapters

00:00:00 Opening: Ten Thousand Untrusted Tenants on One CPU Core in Fifty Microseconds

00:03:40 Stack Virtual Machines vs Register Virtual Machines (JVM…