Go Runtime GC Deep Dive¶

Comprehensive analysis of Go's garbage collector implementation (Go 1.23.12), covering theory from source code to production tuning at scale.

Articles¶

Core GC Mechanisms¶

• GC Pacer - How GC decides when to trigger
• GC Sweep - Lazy sweep and bit flipping
• GC Mark - Concurrent marking and STW
• GC Mutator - Write barrier mechanics

Runtime Integration¶

• Allocation and GC - How allocation triggers GC
• Scavenging - Memory return to OS
• STW to Scan Stack - Stack scanning

Production Case Study¶

• GC Tuner Case Study - Large-scale tuning: 67 services, 49K instances, 1.11 PB memory