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Thread: SMP client won't restart

  1. #1
    The late but legendary peterb - Onward and Upward peterb's Avatar
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    SMP client won't restart

    Athlon 64 bit dual core running Fedora Core 6. Was running teh SMP client beautifully on beta release 2. I had to reboot the machine this evening - since then te processes run, but the CPU core loading is only 1 or 2% - previously it was 98 to 99%.

    Eventually I deleted the directory (and a 92% complete WU) and re-installed. same problem. 4 processes running - as before but minimal CPU loading.

    Any ideas?
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    Re: SMP client won't restart

    network issues? my ps3 hasn't been producing for a few days due to issues on their server

  3. #3
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    Re: SMP client won't restart

    It seems to download (something) OK (te work unit) but hangs when it reports localhost) however I was 90% through a WU when I restarted it - and it didn't pick up again.

    Just tried in single processor mode - running fine - two instances, one per core. Just cleard ot the directory I use for smp - reloaded, re-config - downloads core and WU - then nothing! Wierd!
    Last edited by peterb; 09-02-2008 at 10:53 AM.
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    Re: SMP client won't restart

    very. this is fedora, right? check whether it's something securityish, e.g. a firewall or selinux config thing. or, try it as root.

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    Re: SMP client won't restart

    Se Linux set to permissive - running as root makes no difference.

    This is the output

    [17:13:44] - Machine ID: 1
    [17:13:44]
    [17:13:44] Loaded queue successfully.
    [17:13:44]
    [17:13:44] + Processing work unit
    [17:13:44] Core required: FahCore_a1.exe
    [17:13:44] Core found.
    [17:13:44] Working on Unit 01 [February 9 17:13:44]
    [17:13:44] + Working ...
    NNODES=4, MYRANK=2, HOSTNAME=peter.hillside
    NNODES=4, MYRANK=1, HOSTNAME=peter.hillside
    NNODES=4, MYRANK=3, HOSTNAME=peter.hillside
    NNODES=4, MYRANK=0, HOSTNAME=peter.hillside

    The log is identical except it doesn''t have the 4 lines atthe end
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    Re: SMP client won't restart

    OK - cracked it! (With a pointer from someone in the FAH forums to look at the hosts file.)

    Although this had an entry

    127.0.0.1 localhost

    it seems that was not enough. The machine is peter and the local domain is hillside - so amending the first line to

    127.0.0.1 localhost localhost.localdomain localhost.hillside peter.hillside

    has covered all eventualities - and smp is back on line. Shame about the 92% complete WU I lost though though.

    So the uniprocesses have been restarted with the oneunit option to run them to completion, and all should be well again!

    And interestingly - the whole machine is a WHOLE lot more responsive - opening a terminal window was taking 5 to 10 seconds - now it is instantaneous.

    So - can anyone explain what the localhost setting does in multicore processors? Presumably it affects intercore pipes...

    (Sorry for the delay in posting - I've been sufferening from a bad case of Manflu )
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    Comfortably Numb directhex's Avatar
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    Re: SMP client won't restart

    Quote Originally Posted by peterb View Post
    OK - cracked it! (With a pointer from someone in the FAH forums to look at the hosts file.)

    Although this had an entry

    127.0.0.1 localhost

    it seems that was not enough. The machine is peter and the local domain is hillside - so amending the first line to

    127.0.0.1 localhost localhost.localdomain localhost.hillside peter.hillside

    has covered all eventualities - and smp is back on line. Shame about the 92% complete WU I lost though though.

    So the uniprocesses have been restarted with the oneunit option to run them to completion, and all should be well again!

    And interestingly - the whole machine is a WHOLE lot more responsive - opening a terminal window was taking 5 to 10 seconds - now it is instantaneous.

    So - can anyone explain what the localhost setting does in multicore processors? Presumably it affects intercore pipes...

    (Sorry for the delay in posting - I've been sufferening from a bad case of Manflu )
    there are no pipes involved with f@h, it's all MPI. MPI is a point-to-point system, where each node listens & sends to other MPI processes. in a cluster, you might have four machines (node1->node4) which talk to each other, based on that hostname "node4"

    in your case, "HOSTNAME=peter.hillside" is the key, as the MPI processes are expecting to use that hostname. they need to be able to resolve the hostname to an IP, fast. /etc/nsswitch.conf dictates how hostnames should be found - typically, 'files' is the first checked method, and therefore the fastest

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  9. #8
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    Re: SMP client won't restart

    Thank you - I see one or two other people have had smp problems - would the same apply to the windows kernel?
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    Comfortably Numb directhex's Avatar
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    Re: SMP client won't restart

    Quote Originally Posted by peterb View Post
    Thank you - I see one or two other people have had smp problems - would the same apply to the windows kernel?
    it would, though there's no nsswitch for overrides. /etc/hosts is in c:\windows\system32\drivers

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