I was Confusing to benchmark my FTP server. I have to read many manual. I use dkftpbench to generate connection to server. The sintax is :

dkftpbench -n1 -h10.14.200.64 -v -uiard -p123123. But some error in there
this is error :

Using poll()
1 users alive, 0 users dead; at least 15 seconds to end of test
ftp_client_pipe_t::notifyPollEvent_dfd: connect dfd 4 failed, errno 101
robouser0::ftpCmdDone: xerr 101, aborting
ftp_client_pipe_t::shutdown(): m_state 1, cfd 3, dfd 4, id 0
All users dead. Test failed.

I hope all friends can help me