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main.go
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main.go
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package main
import (
"flag"
"fmt"
"os"
"strconv"
"time"
)
var N time.Duration
var NTHREAD int
func smallfile(name string, data []byte) {
f, err := os.Create(name)
if err != nil {
panic(err)
}
_, err = f.Write(data)
if err != nil {
panic(err)
}
f.Sync()
f.Close()
err = os.Remove(name)
if err != nil {
panic(err)
}
}
func mkdata(sz uint64) []byte {
data := make([]byte, sz)
for i := range data {
data[i] = byte(i % 128)
}
return data
}
func client(p string) int {
data := mkdata(uint64(100))
start := time.Now()
i := 0
for {
s := strconv.Itoa(i)
smallfile(p+"/x"+s, data)
i++
t := time.Now()
elapsed := t.Sub(start)
if elapsed >= N {
break
}
}
return i
}
func run(nt int) {
path := "/mnt/nfs/"
count := make(chan int)
for i := 0; i < nt; i++ {
d := "d" + strconv.Itoa(i)
go func(d string) {
err := os.MkdirAll(path+"/"+d+"/", 0700)
if err != nil {
panic(err)
}
count <- client(path + d)
}(d)
}
n := 0
for i := 0; i < nt; i++ {
n += <-count
}
fmt.Printf("fs-smallfile: %v %v file/sec\n", nt, float64(n)/N.Seconds())
}
func main() {
var start int
flag.DurationVar(&N, "benchtime", 10*time.Second, "time to run each iteration for")
flag.IntVar(&start, "start", 1, "number of threads to start at")
flag.IntVar(&NTHREAD, "threads", 1, "number of threads to run till")
flag.Parse()
if start < 1 {
panic("invalid start")
}
for i := start; i <= NTHREAD; i++ {
run(i)
}
}