python8384
diff --git a/‎GC/GC.md
Lines changed: 518 additions & 87 deletions b/‎GC/GC.md
Lines changed: 518 additions & 87 deletions
diff --git a/‎GC/assets/gc-leak.png
-234 KB b/‎GC/assets/gc-leak.png
-234 KB
diff --git a/‎GC/assets/gc-leak1.png
63.8 KB b/‎GC/assets/gc-leak1.png
63.8 KB
diff --git a/‎GC/assets/gc-mark-assist.png
502 KB b/‎GC/assets/gc-mark-assist.png
502 KB
diff --git a/‎GC/assets/gc-mark-sweep.png
478 KB b/‎GC/assets/gc-mark-sweep.png
478 KB
diff --git a/‎GC/assets/gc-mutator.png
-2.14 KB b/‎GC/assets/gc-mutator.png
-2.14 KB
diff --git a/‎GC/assets/gc-trace.png
54.4 KB b/‎GC/assets/gc-trace.png
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diff --git a/‎GC/assets/gc-trace2.png
388 KB b/‎GC/assets/gc-trace2.png
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diff --git a/‎GC/code/10/main.go
Lines changed: 37 additions & 0 deletions b/‎GC/code/10/main.go
Lines changed: 37 additions & 0 deletions
diff --git a/‎GC/code/12/gc.txt
Lines changed: 20 additions & 0 deletions b/‎GC/code/12/gc.txt
Lines changed: 20 additions & 0 deletions
@@ -0,0 +1,37 @@
+package main
+
+import (
+	"os"
+	"runtime"
+	"runtime/trace"
+	"sync/atomic"
+)
+
+var stop uint64
+
+func gcfinished() *int {
+	p := 1
+	runtime.SetFinalizer(&p, func(_ *int) {
+		println("gc finished")
+		atomic.StoreUint64(&stop, 1)
+	})
+	return &p
+}
+
+func allocate() {
+	// 每次调用分配 0.25MB，第一次触发 GC 时，此函数被调用了 15 次
+	_ = make([]byte, int((1<<20)*0.25))
+}
+
+func main() {
+	f, _ := os.Create("trace.out")
+	defer f.Close()
+	trace.Start(f)
+	defer trace.Stop()
+	gcfinished()
+	for n := 1; atomic.LoadUint64(&stop) != 1; n++ {
+		println("#allocate: ", n)
+		allocate()
+	}
+	println("terminate")
+}
@@ -0,0 +1,20 @@
+$ GODEBUG=gctrace=1 ./main
+
+gc 1 @0.000s 2%: 0.009+0.23+0.004 ms clock, 0.11+0.083/0.019/0.14+0.049 ms cpu, 4->6->2 MB, 5 MB goal, 12 P
+scvg: 8 KB released
+scvg: inuse: 3, idle: 60, sys: 63, released: 57, consumed: 6 (MB)
+gc 2 @0.001s 2%: 0.018+1.1+0.029 ms clock, 0.22+0.047/0.074/0.048+0.34 ms cpu, 4->7->3 MB, 5 MB goal, 12 P
+scvg: inuse: 3, idle: 60, sys: 63, released: 56, consumed: 7 (MB)
+gc 3 @0.003s 2%: 0.018+0.59+0.011 ms clock, 0.22+0.073/0.008/0.042+0.13 ms cpu, 5->6->1 MB, 6 MB goal, 12 P
+scvg: 8 KB released
+scvg: inuse: 2, idle: 61, sys: 63, released: 56, consumed: 7 (MB)
+gc 4 @0.003s 4%: 0.019+0.70+0.054 ms clock, 0.23+0.051/0.047/0.085+0.65 ms cpu, 4->6->2 MB, 5 MB goal, 12 P
+scvg: 8 KB released
+scvg: inuse: 3, idle: 60, sys: 63, released: 56, consumed: 7 (MB)
+scvg: 8 KB released
+scvg: inuse: 4, idle: 59, sys: 63, released: 56, consumed: 7 (MB)
+gc 5 @0.004s 12%: 0.021+0.26+0.49 ms clock, 0.26+0.046/0.037/0.11+5.8 ms cpu, 4->7->3 MB, 5 MB goal, 12 P
+scvg: inuse: 5, idle: 58, sys: 63, released: 56, consumed: 7 (MB)
+gc 6 @0.005s 12%: 0.020+0.17+0.004 ms clock, 0.25+0.080/0.070/0.053+0.051 ms cpu, 5->6->1 MB, 6 MB goal, 12 P
+scvg: 8 KB released
+scvg: inuse: 5, idle: 58, sys: 63, released: 56, consumed: 7