What does "No shared memory segment" signify ??


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Message boards : Unix/Linux : What does "No shared memory segment" signify ??

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jay_e
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Message 18060 - Posted 3 Mar 2012 4:38:45 UTC

    http://www.malariacontrol.net/workunit.php?wuid=61819797

    Hi,
    I have a WU that has given an error and has taken a long time.

    Should I abort it and reset the project as mentioned in the error text?

    I would like to know more about what causes the "no shared memory segment" error.

    Does that error mean that I should abort the WU?
    Or does it mean that BOINC did restart the WU?

    Background data:


    from BOINC Messages:
    Fri 17 Feb 2012 01:49:15 AM EST Starting BOINC client version 6.10.58 for i686-pc-linux-gnu
    Fri 17 Feb 2012 01:49:15 AM EST Processor: 1 GenuineIntel Intel(R) Celeron(R) M processor 1.70GHz [Family 6 Model 13 Stepping 8]
    Fri 17 Feb 2012 01:49:15 AM EST Processor: 1.00 MB cache
    Fri 17 Feb 2012 01:49:15 AM EST Processor features: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov clflush dts acpi mmx fxsr sse sse2 ss tm pbe nx up bts
    Fri 17 Feb 2012 01:49:15 AM EST OS: Linux: 2.6.32-5-686
    Fri 17 Feb 2012 01:49:15 AM EST Memory: 1.97 GB physical, 4.66 GB virtual
    Fri 17 Feb 2012 01:49:15 AM EST Disk: 41.25 GB total, 33.98 GB free

    [ skip thru time........]

    Fri 02 Mar 2012 12:23:15 AM EST malariacontrol.net Starting wu_1203_426_152303_0_1330659171_1

    Fri 02 Mar 2012 01:00:00 PM EST Suspending computation - time of day
    Fri 02 Mar 2012 01:00:11 PM EST malariacontrol.net Task wu_1203_426_152303_0_1330659171_1: no shared memory segment
    Fri 02 Mar 2012 01:00:11 PM EST malariacontrol.net Task wu_1203_426_152303_0_1330659171_1 exited with zero status but no 'finished' file
    Fri 02 Mar 2012 01:00:11 PM EST malariacontrol.net If this happens repeatedly you may need to reset the project.
    Fri 02 Mar 2012 02:00:00 PM EST Resuming computation

    ------
    FROM WU Details
    Workunit 61819797

    name wu_1203_426_152303_0_1330659171
    application openMalaria: A simulator of malaria epidemology and control (Branch B)
    created 2 Mar 2012 3:32:51 UTC
    Tasks in progress suppressed pending completion

    ---
    Link to the task:
    http://www.malariacontrol.net/result.php?resultid=115484707


    At 23:21 EST, The BOINC status says:
    Time elapsed: 21:57:50
    Progress: 76%
    To Completion: 06:31.34

    I have BOINC set up to suspend all projects for 2 hours in the afternoon when an antivirus scan runs.

    It looks like the error happened when BOINC tried to suspend.


    All suggestions, advice, tomatoes are welcome.
    (I'll to avoid the tomatoes...)


    T H A N K Y O U !!
    Jay E.

    hardy
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    Message 18067 - Posted 4 Mar 2012 8:13:17 UTC

      No shared memory segment must mean the work-unit and the BOINC manager can't communicate. Do as the message says — i.e. if this doesn't usually happen don't worry about it, and if it keeps happening, reset the project.

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