Experimental Physics and
Industrial Control System

[email protected] · Tue, 16 Apr 2002 08:51:43 -0500 (CDT)

Bernd,

We are quite familiar with this anomaly. Here are some suggestions:

TO ELIMINATE THE PROBLEM:
  - Upgrade your EPICS release to 3.13.6 which uses Tornado 2.02. 
    Some of our most troublesome iocs have never experienced the
    problem since moving to this new version of vxWorks.

TO MINIMIZE THE PROBLEM in R3.13.2:
  - Install a faster CPU. We also have noticed that heavily loaded
    CPUs are the most susceptible.

TO MINIMIZE THE PROBLEM prior to R3.13.2:
  - Place the following lines in your st.cmd file to make tNetTask
    a higher priority than any EPICS tasks ...

    # Assign a higher priority to tNetTask
    taskPrioritySet(taskNameToId("tNetTask"),30)

Hope this helps ....

      Ned

>Hi all,
>
>I have a problem, that Jim Olsen (SLAC)  has described in a tech-talk
>mail in february 2000. We are using Epics 3.13.1 and the tNetTask ist
>taking all CPU-time sometimes (happened 2 times now). That causes most
>IOC tasks to hang. It seems to me this is triggered due to heavy network
>traffic. I discovered that during network problems the CPU-load of the
>IOC goes up to 100%. But it's not allways hanging afterwards. In the
>tech-talk archive I didn't find a solution for this problem. Do you
>remember how this problem was fixed ? Which patch is needed?
>
>Thanks
>
>Bernd
>
>

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System