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  1. Jenkins
  2. JENKINS-22297

ssh-slave connection seems to have performance issues

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    • Icon: Bug Bug
    • Resolution: Fixed
    • Icon: Blocker Blocker
    • ssh-slaves-plugin
    • CentOS release 6.4 (Final)
      OpenSSH_5.3p1, OpenSSL 1.0.0-fips 29 Mar 2010
      Jenkins 1.532.1 LTS
      apache-tomcat-6.0.37
      ssh-slaves-plugin version 1.5

      hi,

      we experienced increasingly high amounts of CPU usage on our jenkins master machine:
      i made a CPU sample using visualVM (screenshot attached)
      the sample shows excessive CPU-time at CipherInputStream.fill_buffer() which performs the actual read from the ssh-connection as far as i understand this.
      the sample only looks like this when a build is performed on a slave. I'm pretty sure the main cause of traffic via CipherInputStream is to stream logfiles of builds or other stuff that's getting archived.

      the slaves are running on
      CentOS release 6.4 (Final)
      [kazesberger@grzcislave32 ~]$ ssh -V
      OpenSSH_5.3p1, OpenSSL 1.0.0-fips 29 Mar 2010

      the jenkins-master has no execution-slots itself.
      we are using ssh-slaves-plugin version 1.5

      currently i do not have any clue whether the problem is at trilead-ssh2-jenkins or at OpenSSH. the symptom occurs on the trilead-ssh2-jenkins side.

        1. visualvm_cipherInputStream.png
          77 kB
          Klaus Azesberger

          [JENKINS-22297] ssh-slave connection seems to have performance issues

          Klaus Azesberger created issue -
          Jean-David Maillefer made changes -
          Link New: This issue is duplicated by JENKINS-22320 [ JENKINS-22320 ]
          Jean-David Maillefer made changes -
          Link New: This issue is related to JENKINS-20550 [ JENKINS-20550 ]
          R. Tyler Croy made changes -
          Workflow Original: JNJira [ 154378 ] New: JNJira + In-Review [ 178780 ]
          Ivan Fernandez Calvo made changes -
          Assignee Original: Kohsuke Kawaguchi [ kohsuke ] New: Ivan Fernandez Calvo [ ifernandezcalvo ]
          Ivan Fernandez Calvo made changes -
          Resolution New: Fixed [ 1 ]
          Status Original: Open [ 1 ] New: Closed [ 6 ]

            ifernandezcalvo Ivan Fernandez Calvo
            mcklaus Klaus Azesberger
            Votes:
            4 Vote for this issue
            Watchers:
            4 Start watching this issue

              Created:
              Updated:
              Resolved: