test files:
1)test the re module
2)test the socket files
3)test the ssh client --paramiko
4)draw the figures of the cluster smalliobench
  $ smalliobench --io-size 4194304 --objects 1000 >
  /tmp/osd_0_write_4194304
Merge branch 'master' of github.com:hjwsm1989/learn