write a lot of files

unmaintained/stress_filer_upload/write_files/write_files.go

@@ -0,0 +1,49 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"math/rand"
+	"os"
+)
+
+var (
+	minSize   = flag.Int("minSize", 1024, "min file size")
+	maxSize   = flag.Int("maxSize", 10*1024*1024, "max file size")
+	fileCount = flag.Int("fileCount", 1, "number of files to write")
+	blockSize = flag.Int("blockSizeKB", 4, "write block size")
+	toDir     = flag.String("dir", ".", "destination directory")
+)
+
+func check(e error) {
+	if e != nil {
+		panic(e)
+	}
+}
+
+func main() {
+
+	flag.Parse()
+
+	block := make([]byte, *blockSize)
+
+	for i := 0; i < *fileCount; i++ {
+
+		f, err := os.Create(fmt.Sprintf("%s/file%05d", *toDir, i))
+		check(err)
+
+		fileSize := *minSize + rand.Intn(*maxSize-*minSize)
+
+		for x := 0; x < fileSize; {
+			rand.Read(block)
+			_, err = f.Write(block)
+			check(err)
+			x += *blockSize
+		}
+
+		err = f.Close()
+		check(err)
+
+	}
+
+}