Gc in golang
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The document discusses tri-color garbage collection used in Go. It has three main phases: root scanning to identify reachable objects, mark phase to mark reachable objects, and sweep phase to free unmarked objects. This approach aims to minimize mutator pause times during garbage collection by using a write barrier to track pointers to unscanned objects during concurrent marking. The document also provides examples comparing memory usage and GC performance between using lists versus slices in Go code.
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![test code
package main
import (
"time"
)
func GenSlice() {
s:= make([]string, 10000)
for i:= 0;i<10000;i++ {
str := "aaaaaaaaaaaaaaaaaaa"
s[i] = str
}
}
func main() {
count := 0
for {
count++
for i := 0; i < 1000; i++ {
go func() {
GenSlice()
}()
}
time.Sleep(500 * time.Millisecond)
if count == 360 {
time.Sleep(10000 * time.Millisecond)
count =0
}
}
}](https://image.slidesharecdn.com/gcingolang-170323150708/85/Gc-in-golang-27-320.jpg)
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Microsoft Purview Information Protection and DLP
Sensitivity labels, auto-labeling, and adaptive protection
Data discovery, classification, and content labeling
DLP for both labeled and unlabeled content
SharePoint Advanced Management for workspace governance
Microsoft 365 compliance center best practices
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Don’t wait for perfection—start small and iterate fast.
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Gc in golang
- 1. GC golang
- 2. Tri-color garbage collection • • • garbage
- 3. Tri-color garbage collection • root scan: root ( ) push stack • mark phase: • stack • stack • • stack ( root root ) • sweep phase heap
- 4. Tri-color garbage collection • mark phase & sweep phase mutator pause time
- 5. Tri-color gc
- 7. • A F push stack root scan
- 8. • stack A F push stack mark
- 9. • B C D stack mark
- 10. • sweep
- 11. mark
- 12. • mark A J write barrier
- 13. • A I write barrier
- 15. write barrier • push stack
- 16. sweep
- 17. • < current sweep > current sweep
- 18. GOGC
- 19. GOGC • GOGC golfing GC • GOGC=100 heap 100% GC GC = 200 200%
- 21. tradeoff • tricolor GC pause time • heap size sweep • throughput CPU GC • Spatial Locality
- 22. GC example code
- 23. test code package main import ( "container/list" "time" ) func GenList() { l := list.New() for i := 0; i < 10000; i++ { str := "aaaaaaaaaaaaaaaaaaa" l.PushBack(str) } } func main() { count := 0 for { count++ for i := 0; i < 1000; i++ { go func() { GenList() }() } time.Sleep(500 * time.Millisecond) if count == 360 { time.Sleep(10000 * time.Millisecond) count =0 } } }
- 24. gctrace output • CPU 32% GC • GC pause time 0.18 + 0.98 ms • heap size 625M
- 26. slice List
- 27. test code package main import ( "time" ) func GenSlice() { s:= make([]string, 10000) for i:= 0;i<10000;i++ { str := "aaaaaaaaaaaaaaaaaaa" s[i] = str } } func main() { count := 0 for { count++ for i := 0; i < 1000; i++ { go func() { GenSlice() }() } time.Sleep(500 * time.Millisecond) if count == 360 { time.Sleep(10000 * time.Millisecond) count =0 } } }
- 28. gctrace output • CPU 5% GC • GC pause time 1.1 + 2.1 ms • heap size 156M
- 29. Real Memory size • htop 188M