1 // Copyright 2010 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 package main 6 7 import ( 8 "fmt" 9 "runtime" 10 "sort" 11 "time" 12 ) 13 14 func gcstats(name string, n int, t time.Duration) { 15 st := new(runtime.MemStats) 16 runtime.ReadMemStats(st) 17 nprocs := runtime.GOMAXPROCS(-1) 18 cpus := "" 19 if nprocs != 1 { 20 cpus = fmt.Sprintf("-%d", nprocs) 21 } 22 fmt.Printf("garbage.%sMem%s Alloc=%d/%d Heap=%d NextGC=%d Mallocs=%d\n", name, cpus, st.Alloc, st.TotalAlloc, st.Sys, st.NextGC, st.Mallocs) 23 fmt.Printf("garbage.%s%s %d %d ns/op\n", name, cpus, n, t.Nanoseconds()/int64(n)) 24 fmt.Printf("garbage.%sLastPause%s 1 %d ns/op\n", name, cpus, st.PauseNs[(st.NumGC-1)%uint32(len(st.PauseNs))]) 25 fmt.Printf("garbage.%sPause%s %d %d ns/op\n", name, cpus, st.NumGC, int64(st.PauseTotalNs)/int64(st.NumGC)) 26 nn := int(st.NumGC) 27 if nn >= len(st.PauseNs) { 28 nn = len(st.PauseNs) 29 } 30 t1, t2, t3, t4, t5 := tukey5(st.PauseNs[0:nn]) 31 fmt.Printf("garbage.%sPause5%s: %d %d %d %d %d\n", name, cpus, t1, t2, t3, t4, t5) 32 33 // fmt.Printf("garbage.%sScan: %v\n", name, st.ScanDist) 34 } 35 36 type T []uint64 37 38 func (t T) Len() int { return len(t) } 39 func (t T) Swap(i, j int) { t[i], t[j] = t[j], t[i] } 40 func (t T) Less(i, j int) bool { return t[i] < t[j] } 41 42 func tukey5(raw []uint64) (lo, q1, q2, q3, hi uint64) { 43 x := make(T, len(raw)) 44 copy(x, raw) 45 sort.Sort(T(x)) 46 lo = x[0] 47 q1 = x[len(x)/4] 48 q2 = x[len(x)/2] 49 q3 = x[len(x)*3/4] 50 hi = x[len(x)-1] 51 return 52 } 53
