What is your experience with manual garbage collector tuning in your projects?

In Go, the garbage collector (GC) works automatically, and in most cases, manual tuning is not required. However, in some projects, especially those with high performance and low latency requirements, fine-tuning of GC parameters may be necessary.

Manual tuning experience usually includes:

• Using the runtime/debug package to change parameters, such as SetGCPercent, which adjusts the frequency of the garbage collector.
• Monitoring GC statistics via runtime.ReadMemStats to analyze memory behavior.

Example of changing the GC trigger threshold:

import (
    "runtime/debug"
)

func main() {
    // Set the GC threshold to 100% (default), can be increased to reduce frequency
    debug.SetGCPercent(200)
    // ... rest of the code
}

Such tuning helps reduce garbage collection pauses but may increase memory consumption. It is important to profile the application carefully before making changes.

If there were no critical performance issues in the project, manual GC tuning is usually not applied.