Zero-Growth Stack, Real Gains: How Stack Allocation Can Save 10% CPU in Go

What this post added

This post details the technical approach to optimize Go runtime stack allocation by disabling adaptive stack growth and pre-allocating stack sizes. It describes the challenges with the default Go runtime behavior, explores alternative solutions like goroutine pooling, and dives into customizing the Go runtime via private linking to modify internal variables like `debug.adaptivestackstart` and `startingStackSize`. The post also outlines a profile-guided workflow for tuning stack sizes in production, including using the pprof library and disassembling binaries to determine function stack usage, leading to a 10% CPU improvement in a key service.