Re: 2nd beta preview looking good!

From: Marc L. Smith (mlsmith_at_colby_dot_edu)
Date: Mon Aug 15 2005 - 14:45:56 PDT

  • Next message: jcduell_at_lbl_dot_gov: "Re: 2nd beta preview looking good!"
    Hi Jason,
    On Aug 15, 2005, at 4:04 PM, jcduell_at_lbl_dot_gov wrote:
    > You could actually have used just
    >   SSH_SERVERS="n1 n2 n3 n4"
    > I.e., the list is per *process* in the job, not per-UPC thread.   
    > There's
    > no difference for non-pthreaded jobs, but there is for pthreaded ones.
    > I need to document this.  Thanks for noticing!
    When I set SSH_SERVERS as you recommend, I get a runtime error:
    [email protected]:~/upc> upcc -T 8 helloworld2.upc
    [email protected]:~/upc> upcrun helloworld2
    Not enough machines in environment variable SSH_SERVERS to satisfy  
    request for (8).
    Only (4) machines available: n1 n2 n3 n4
    *** AMUDP ERROR: Error spawning SPMD worker threads. Exiting...
    [email protected]:~/upc>
    > Finally, you can use $SSH_SERVERS, but it's deprecated.  $UPC_NODES  
    > (or
    > $UPC_NODEFILE) is now preferred.
    When I use UPC_NODES instead of SSH_SERVERS, I encounter the same  
    I've tried to remember, but can't be certain.  I don't think this is  
    a new problem with the beta.  I think this is what occurred before,  
    and the reason I added two copies of n1-n4 in my nodes list.
    I went poking around in upcrun.conf -- I may have missed some  
    configuration steps when I installed.  Should I have specified:
    default_cpus_per_node = 2
    (currently this is blank)
    and also:
    udp_spawn_nodes = n1 n2 n3 n4
    (currently, this is blank)

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