diff --git a/internal/executor/sandbox/executor.go b/internal/executor/sandbox/executor.go
index 4a4cb53..dda11bb 100644
--- a/internal/executor/sandbox/executor.go
+++ b/internal/executor/sandbox/executor.go
@@ -21,7 +21,6 @@ func (e *Sandbox) Run(cmds []stage.Cmd) ([]stage.ExecutorResult, error) {
 		}
 	}
 	// cannot use range loop since we need to change the value
-	results := make([]stage.ExecutorResult, len(cmds))
 	for i := 0; i < len(cmds); i += 1 {
 		cmd := &cmds[i]
 		if cmd.CopyIn == nil {
@@ -32,25 +31,23 @@ func (e *Sandbox) Run(cmds []stage.Cmd) ([]stage.ExecutorResult, error) {
 				cmd.CopyIn[k] = stage.CmdFile{FileID: &fileID}
 			}
 		}
-		// NOTE: send all cmds at once may cause oom, no idea on why
-		pbCmd := convertPBCmd([]stage.Cmd{*cmd})
-		pbReq := &pb.Request{Cmd: pbCmd}
-		slog.Debug("sandbox execute", "i", i, "pbReq size", proto.Size(pbReq))
-		pbRet, err := e.execClient.Exec(context.TODO(), pbReq)
-		if err != nil {
-			return nil, err
-		}
-		slog.Debug("sandbox execute", "i", i, "pbRet size", proto.Size(pbRet))
-		if pbRet.Error != "" {
-			return nil, fmt.Errorf("sandbox execute error: %s", pbRet.Error)
-		}
-		if len(pbRet.Results) == 0 {
-			return nil, fmt.Errorf("sandbox execute error: no result")
-		}
-		result := convertPBResult(pbRet.Results)[0]
-		slog.Debug("sandbox execute", "i", i, "result", result)
+	}
+	pbCmds := convertPBCmd(cmds)
+	for i, pbCmd := range pbCmds {
+		slog.Debug("sandbox execute", "i", i, "pbCmd size", proto.Size(pbCmd))
+	}
+	pbReq := &pb.Request{Cmd: pbCmds}
+	slog.Debug("sandbox execute", "pbReq size", proto.Size(pbReq))
+	pbRet, err := e.execClient.Exec(context.TODO(), pbReq)
+	if err != nil {
+		return nil, err
+	}
+	if pbRet.Error != "" {
+		return nil, fmt.Errorf("sandbox execute error: %s", pbRet.Error)
+	}
+	results := convertPBResult(pbRet.Results)
+	for _, result := range results {
 		maps.Copy(e.cachedMap, result.FileIDs)
-		results[i] = result
 	}
 	return results, nil
 }