summaryrefslogtreecommitdiff
path: root/test/mallocrep.go
diff options
context:
space:
mode:
authorOndřej Surý <ondrej@sury.org>2011-09-13 13:13:40 +0200
committerOndřej Surý <ondrej@sury.org>2011-09-13 13:13:40 +0200
commit5ff4c17907d5b19510a62e08fd8d3b11e62b431d (patch)
treec0650497e988f47be9c6f2324fa692a52dea82e1 /test/mallocrep.go
parent80f18fc933cf3f3e829c5455a1023d69f7b86e52 (diff)
downloadgolang-upstream/60.tar.gz
Imported Upstream version 60upstream/60
Diffstat (limited to 'test/mallocrep.go')
-rw-r--r--test/mallocrep.go69
1 files changed, 69 insertions, 0 deletions
diff --git a/test/mallocrep.go b/test/mallocrep.go
new file mode 100644
index 000000000..9f47e52e2
--- /dev/null
+++ b/test/mallocrep.go
@@ -0,0 +1,69 @@
+// $G $D/$F.go && $L $F.$A && ./$A.out
+
+// 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.
+
+package main
+
+import (
+ "flag"
+ "runtime"
+)
+
+var chatty = flag.Bool("v", false, "chatty")
+
+var oldsys uint64
+
+func bigger() {
+ runtime.UpdateMemStats()
+ if st := runtime.MemStats; 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.MemProfileRate = 0 // disable profiler
+ runtime.MemStats.Alloc = 0 // 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 := runtime.MemStats.Alloc; a != 0 {
+ println("no allocations but stats report", a, "bytes allocated")
+ panic("fail")
+ }
+ b := runtime.Alloc(uintptr(j))
+ runtime.UpdateMemStats()
+ during := runtime.MemStats.Alloc
+ runtime.Free(b)
+ runtime.UpdateMemStats()
+ if a := runtime.MemStats.Alloc; 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
+ }
+ }
+}