1 files changed, 72 insertions, 0 deletions
diff --git a/src/pkg/runtime/mallocrep.go b/src/pkg/runtime/mallocrep.go
new file mode 100644
index 000000000..03ee71edb
--- /dev/null
+++ b/src/pkg/runtime/mallocrep.go
@@ -0,0 +1,72 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Repeated malloc test.
+
+// +build ignore
+
+package main
+
+import (
+	"flag"
+	"runtime"
+)
+
+var chatty = flag.Bool("v", false, "chatty")
+
+var oldsys uint64
+var memstats runtime.MemStats
+
+func bigger() {
+	st := &memstats
+	runtime.ReadMemStats(st)
+	if oldsys < st.Sys {
+		oldsys = st.Sys
+		if *chatty {
+			println(st.Sys, " system bytes for ", st.Alloc, " Go bytes")
+		}
+		if st.Sys > 1e9 {
+			println("too big")
+			panic("fail")
+		}
+	}
+}
+
+func main() {
+	runtime.GC()                    // clean up garbage from init
+	runtime.ReadMemStats(&memstats) // first call can do some allocations
+	runtime.MemProfileRate = 0      // disable profiler
+	stacks := memstats.Alloc        // ignore stacks
+	flag.Parse()
+	for i := 0; i < 1<<7; i++ {
+		for j := 1; j <= 1<<22; j <<= 1 {
+			if i == 0 && *chatty {
+				println("First alloc:", j)
+			}
+			if a := memstats.Alloc - stacks; a != 0 {
+				println("no allocations but stats report", a, "bytes allocated")
+				panic("fail")
+			}
+			b := runtime.Alloc(uintptr(j))
+			runtime.ReadMemStats(&memstats)
+			during := memstats.Alloc - stacks
+			runtime.Free(b)
+			runtime.ReadMemStats(&memstats)
+			if a := memstats.Alloc - stacks; a != 0 {
+				println("allocated ", j, ": wrong stats: during=", during, " after=", a, " (want 0)")
+				panic("fail")
+			}
+			bigger()
+		}
+		if i%(1<<10) == 0 && *chatty {
+			println(i)
+		}
+		if i == 0 {
+			if *chatty {
+				println("Primed", i)
+			}
+			//	runtime.frozen = true
+		}
+	}
+}