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MPI error message and other applicatioins

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Special Forums UNIX and Linux Applications High Performance Computing MPI error message and other applicatioins
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Old 08-13-2009
Question MPI error message and other applicatioins
1st,I'm a newbie.

I've written a mpi program to realize the parallel computing and encounter many problems.

1. When the computing scale is small, that means the communication time is short, just needs few minutes, such as 14 minutes or less. The program runs well and finished the jog.

But when the computing scale is bigger, that means need hours of running to finish,probelms come. After about half an hour's running,the program exsit with abnormal,the error message is that:p4_error: interrupt SIGx: 6
but the calculating result in the running time is correct.I don't understand the meaning of this error message. Any one can interpret it to me specifically? And if someone could give me the mpi error message list to chech each message's meaning , I'll appreciate it a lot.

2. I'd like to set one rank as the master rank, and give it higher priority. But I still don't know how to se the priority in unix. Maybe someone could give me a way.

Thank you for all your help.
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LEARN ABOUT DEBIAN

lam

LAM(7)								   LAM OVERVIEW 							    LAM(7)

NAME

       LAM - introduction to Local Area Multicomputer (LAM)

DESCRIPTION

       LAM  is	an  MPI  programming environment and development system for a message-passing parallel machine constituted with heterogeneous UNIX
       computers on a network.	With LAM, a dedicated cluster or an existing network computing infrastructure can act  as  one	parallel  computer
       solving	one  compute-intensive problem.  LAM emphasizes productivity in the application development cycle with extensive control and moni-
       toring functionality.  The user can easily debug the common errors in parallel programming and is well equipped to diagnose more  difficult
       problems.

       LAM  features  a  full  implementation of the MPI communication standard, with the exception that the MPI_CANCEL function will not properly
       cancel messages that have been sent.

   User Information
       Users are strongly encouraged to read the LAM/MPI User's Guide that is included with the LAM/MPI distribution, and is provided on the  main
       LAM/MPI web site (http://www.lam-mpi.org/).

   Up-to-Date Information
       The  LAM home page can be found on the World Wide Web at: http://www.lam-mpi.org/.  It should be consulted for the most current information
       about LAM, as well as updates, patches, etc.

SEE ALSO

   Overview of Commands and Libraries
       introu(1), introc(2), INTROF(2)

   System Services Interface (SSI)
       lamssi(7), lamssi_boot(7), lamssi_coll(7), lamssi_rpi(7)

   Starting / Stopping LAM
       recon(1), lamboot(1), lamhalt(1), lamnodes(1), lamwipe(1), tping(1), lamgrow(1), lamshrink(1)

   Compiling MPI Applications
       mpicc(1), mpiCC(1), mpif77(1)

   Running MPI Applications
       mpirun(1), lamclean(1)

   Running Non-MPI Applications
       lamexec(1)

   Monitoring MPI Applications
       mpitask(1)

   Unloading MPI Trace Data
       lamtrace(1)

   Reference Documents
       "LAM/MPI Installation Guide"
	      included in the LAM/MPI distribution and available on http://www.lam-mpi.org/

       "LAM/MPI User's Guide"
	      included in the LAM/MPI distribution and available on http://www.lam-mpi.org/

       "LAM Frequently Asked Questions"
	      at http://www.lam-mpi.org/faq/

       "MPI Primer / Developing with LAM", Ohio Supercomputer Center

       "MPI: A Message-Passing Interface Standard", Message-Passing Interface Forum, version 1.1
	      at http://www.mpi-forum.org/

       "MPI-2: Extensions to the Message Passing Interface", Message Passing Interface Forum, version 2.0
	      at http://www.mpi-forum.org/

   MPI Quick Tutorials
       "LAM/MPI ND User Guide / Introduction"
	      at http://www.lam-mpi.org/mpi/tutorials/lam/

       "MPI: It's Easy to Get Started"

       "MPI: Everyday Datatypes"

       "MPI: Everyday Collective Communication"

   Guaranteed Envelope Resources
       "Robust MPI Message Delivery Through Guaranteed Resources", MPI Developer's Conference, 1995

LAM 7.1.4							    July, 2007								    LAM(7)