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  1. Jenkins
  2. JENKINS-22297

ssh-slave connection seems to have performance issues

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      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.

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            ymartin1040 Yves Martin added a comment -

            I confirm I have the same problem.

            I had to switch my Linux slaves to WebStart (JNLP) agent.
            My master CPU consumption just drops to only 10% in average (and often less)

            And as a consequence, my job executions are now three time faster.

            Show
            ymartin1040 Yves Martin added a comment - I confirm I have the same problem. I had to switch my Linux slaves to WebStart (JNLP) agent. My master CPU consumption just drops to only 10% in average (and often less) And as a consequence, my job executions are now three time faster.
            Hide
            ymartin1040 Yves Martin added a comment -

            After upgrade to 1.625.1, SSH slave communication is now as efficient as WebStart agent.
            As a result, I consider this issue as fixed.

            Show
            ymartin1040 Yves Martin added a comment - After upgrade to 1.625.1, SSH slave communication is now as efficient as WebStart agent. As a result, I consider this issue as fixed.

              People

              • Assignee:
                ifernandezcalvo Ivan Fernandez Calvo
                Reporter:
                mcklaus Klaus Azesberger
              • Votes:
                4 Vote for this issue
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                  Updated:
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