Created
March 23, 2016 09:42
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package main | |
import ( | |
"flag" | |
"fmt" | |
"math/rand" | |
"runtime" | |
) | |
type ( | |
intSet map[int32]struct{} | |
) | |
func buildSet(n int) intSet { | |
s := intSet{} | |
for i := 0; i < n; i++ { | |
s[int32(i)] = struct{}{} | |
} | |
return s | |
} | |
func buildRandomSet(n int) intSet { | |
s := intSet{} | |
for i := 0; i < n; i++ { | |
s[rand.Int31()] = struct{}{} | |
} | |
return s | |
} | |
// make sure set can not be garbage collected until we are done | |
func useSet(s intSet, n int) { | |
if len(s) == n*n { | |
panic("wtf") | |
} | |
} | |
func main() { | |
maxN := flag.Int("maxN", 100*1000*1000, "maximum number of set elements") | |
flag.Parse() | |
data := []struct { | |
name string | |
ctor func(int) intSet | |
}{ | |
{"linear", buildSet}, | |
{"random", buildRandomSet}, | |
} | |
for _, d := range data { | |
for n := 10; n <= *maxN; n *= 10 { | |
s := d.ctor(n) | |
runtime.GC() | |
var m runtime.MemStats | |
runtime.ReadMemStats(&m) | |
fmt.Printf("%v %v:\t%v bytes\t(%v per element)\n", n, d.name, m.Alloc, float64(m.Alloc)/float64(n)) | |
useSet(s, n) | |
} | |
} | |
} |
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Go 1.6, OS X 64bit: