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54 lines
1019 B
54 lines
1019 B
package main
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import (
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"flag"
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"fmt"
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"math/rand"
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"os"
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"time"
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)
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var (
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minSize = flag.Int("minSize", 1024, "min file size")
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maxSize = flag.Int("maxSize", 3*1024*1024, "max file size")
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fileCount = flag.Int("n", 1, "number of files to write")
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blockSize = flag.Int("blockSizeKB", 4, "write block size")
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toDir = flag.String("dir", ".", "destination directory")
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)
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func check(e error) {
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if e != nil {
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panic(e)
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}
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}
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func main() {
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flag.Parse()
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block := make([]byte, *blockSize*1024)
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for i := 0; i < *fileCount; i++ {
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f, err := os.Create(fmt.Sprintf("%s/file%05d", *toDir, i))
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check(err)
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fileSize := *minSize + rand.Intn(*maxSize-*minSize)
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startTime := time.Now()
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fmt.Printf("write %s %d bytes: ", f.Name(), fileSize)
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for x := 0; x < fileSize; {
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rand.Read(block)
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_, err = f.Write(block)
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check(err)
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x += len(block)
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}
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err = f.Close()
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check(err)
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fmt.Printf("%.02f MB/sec\n", float64(fileSize)*float64(time.Second)/float64(time.Now().Sub(startTime)*1024*1024))
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}
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}
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