Save multiple files in parallel

cmd/khepri/cmd_backup.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"os"
 	"strings"
+	"time"
 
 	"github.com/fd0/khepri"
 	"github.com/fd0/khepri/backend"
@@ -92,12 +93,15 @@ func commandBackup(be backend.Server, key *khepri.Key, args []string) error {
 		}
 	}
 
+	start := time.Now()
 	sn, id, err := arch.Snapshot(target, t)
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "error: %v\n", err)
 	}
 
 	fmt.Printf("\nsnapshot %s saved: %v\n", id, sn)
+	duration := time.Now().Sub(start)
+	fmt.Printf("duration: %s, %.2fMiB/s\n", duration, float64(arch.Stats.Bytes)/float64(duration/time.Second)/(1<<20))
 
 	return nil
 }

cmd/khepri/main.go

@@ -5,6 +5,7 @@ import (
 	"log"
 	"net/url"
 	"os"
+	"runtime"
 	"sort"
 	"strings"
 
@@ -128,6 +129,9 @@ func init() {
 	commands["snapshots"] = commandSnapshots
 	commands["cat"] = commandCat
 	commands["ls"] = commandLs
+
+	// set GOMAXPROCS to number of CPUs
+	runtime.GOMAXPROCS(runtime.NumCPU())
 }
 
 func main() {