Hello,
We are currently using JSCH for doing SFTP from a Remote Redhat Linux server
to a Local Redhat Linux Server.
The command line SFTP fetches a 100 MB File in 6 seconds, where as the Java
program using JSCH gets the file in 30 seconds.
While monitoring netstat on the remote server, we noticed that the Send-Q
shows a max of 32K waiting for client to read during the SFTP using JSCH,
but during command line SFTP it shows around 400K waiting for client to
read.
I tested my application using both release 44 and 45-rc5 and there is no
difference in performance .
It seems like JSCH is reading data at 32K chunks, do you have any
suggestions on how to increase the chunk size JSCH?
Application log.(the lines one without date is from JSCH)
Thu Jun 16 10:23:15 PDT 2011 Connecting to SFTP Session...
INFO: Connecting to nnn.nnn.nnn.nnn port 22
INFO: Connection established
INFO: Remote version string: SSH-2.0-OpenSSH_4.3
INFO: Local version string: SSH-2.0-JSCH-0.1.45
INFO: CheckCiphers:
aes256-ctr,aes192-ctr,aes128-ctr,aes256-cbc,aes192-cbc,aes128-cbc,3des-ctr,arcfour,arcfour128,arcfour256
INFO: aes256-ctr is not available.
INFO: aes192-ctr is not available.
INFO: aes256-cbc is not available.
INFO: aes192-cbc is not available.
INFO: arcfour256 is not available.
INFO: CheckKexes: diffie-hellman-group14-sha1
INFO: diffie-hellman-group14-sha1 is not available.
INFO: SSH_MSG_KEXINIT sent
INFO: SSH_MSG_KEXINIT received
INFO: kex: server->client aes128-ctr hmac-md5 none
INFO: kex: client->server aes128-ctr hmac-md5 none
INFO: SSH_MSG_KEXDH_INIT sent
INFO: expecting SSH_MSG_KEXDH_REPLY
INFO: ssh_rsa_verify: signature true
WARN: Permanently added 'nnn.nnn.nnn.nnn' (RSA) to the list of known hosts.
INFO: SSH_MSG_NEWKEYS sent
INFO: SSH_MSG_NEWKEYS received
INFO: SSH_MSG_SERVICE_REQUEST sent
INFO: SSH_MSG_SERVICE_ACCEPT received
INFO: Authentications that can continue:
gssapi-with-mic,publickey,keyboard-interactive,password
INFO: Next authentication method: gssapi-with-mic
INFO: Authentications that can continue:
publickey,keyboard-interactive,password
INFO: Next authentication method: publickey
INFO: Authentication succeeded (publickey).
Thu Jun 16 10:23:17 PDT 2011 Connecting to SFTP Channel...
Thu Jun 16 10:23:17 PDT 2011 Connected to SFTP Server...
Thu Jun 16 10:23:17 PDT 2011 Getting the Input stream....
Thu Jun 16 10:23:17 PDT 2011 Got the Input stream....
Thu Jun 16 10:23:17 PDT 2011 Progress....
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53
54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78
79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100
Thu Jun 16 10:23:49 PDT 2011 Copied InputStream into a File....Size:
100000000
Thu Jun 16 10:23:49 PDT 2011 Exiting SFTP connection...
INFO: Disconnecting from nnn.nnn.nnn.nnn port 22
Thank you.
Sree.
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