| // $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() { |
| 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 { |
| panicln("too big") |
| } |
| } |
| } |
| |
| func main() { |
| flag.Parse() |
| runtime.MemStats.Alloc = 0 // ignore stacks |
| 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 { |
| panicln("no allocations but stats report", a, "bytes allocated") |
| } |
| b := runtime.Alloc(uintptr(j)) |
| during := runtime.MemStats.Alloc |
| runtime.Free(b) |
| if a := runtime.MemStats.Alloc; a != 0 { |
| panic("allocated ", j, ": wrong stats: during=", during, " after=", a, " (want 0)") |
| } |
| bigger() |
| } |
| if i%(1<<10) == 0 && *chatty { |
| println(i) |
| } |
| if i == 0 { |
| if *chatty { |
| println("Primed", i) |
| } |
| // runtime.frozen = true; |
| } |
| } |
| } |