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Thread: Terminal Randomly Freezes

  1. #1
    Join Date
    Sep 2013
    Beans
    8

    Question Terminal Randomly Freezes

    Problem:
    When running an application (for example via a launcher with terminal or straight from a terminal instance), the terminal randomly freezes. That is, the output stops in mid-stream after a random period.

    I discovered this while trying to run some long-running machine learning applications using a terminal.

    Terminals Affected:

    gnome-terminal
    mate-terminal

    Confirmed:
    Occurs with python test applications (see code below) or java applications. This also occurs randomly. See the sample code below (save to file and execute in a terminal). Using this code you can see the output freezes perhaps after a few minutes. In other words, the terminal scrolls output and then just stops mid-stream. To resume, you either need to:
    1. expressly select reset & clear or
    2. double click on the terminal window or
    3. UNRELIABLE--possibly just try to scroll back and fourth.


    What I Tried:
    Using various terminals, I have tried setting scrollback on, off, unlimited, or 512 lines--in other words, I have tried everything that I am aware to avoid some type of obvious "buffer" issue. I have also written teh test case below. Oddly, this occurs in any of the GUI terminals--but MIGHT not occur with xterm (I have never seen the issue occur with xterm so far).

    Test Code:
    Code:
    import time
    
    starttime = time.time()
    
    i = 0
    
    while(True):    
        i = i + 1
        print("Still working " , i, " " , time.time() - starttime)
    Specs:
    Ubuntu 13.04
    MATE 1.6 (but also occurs in Ubuntu Default, GNOME3, etc.)
    i7
    32Gb memory
    NVidia 760

  2. #2
    Join Date
    Sep 2013
    Beans
    8

    Re: Terminal Randomly Freezes

    Possible Resolution:

    I confirmed that the terminal freezes randomly when running a terminal instance such as MATE Terminal or GNOME Terminal. The freezing or stopping did not occur with XTerm.

    This lead me to think that this was a video issue. Because I am using a new video card (Nvidia GTX 760) as of August 2013, I started to investigate the video card driver itself. I was apparently using an older version of the Nouveau Driver. I did not install the Nvidia proprietary drivers (currently 3.25).

    I uninstalled Ubunut Nvidia Current and installed Nvidia 319 using Syntaptics (the option does not appear in Ubuntu SoftwareCenter). The install, even on a high-end machine took quite some time. I then selected the Additional Drivers and the NVIDIA binary xorg driver (NOT Nouveau). Again, this took a while to make the change.

    Subsequent testing using the above test Python code shows the video driver update resolved the problem.

  3. #3
    Join Date
    Nov 2008
    Location
    S.H.I.E.L.D. 6-1-6
    Beans
    Hidden!
    Distro
    Ubuntu Development Release

    Re: Terminal Randomly Freezes

    PLease do not create multiple threads as this dilutes community effort

    Thread closed

    =>http://ubuntuforums.org/showthread.php?t=2176896
    Don't waste your energy trying to change opinions ... Do your thing, and don't care if they like it.

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