On Fri, 6 Sep 2002 kl68_at_[hidden] wrote:
> we are running Ls-Dyna MPP960 softerware with LAM6.5.6 for our
> application under RedHat Linux 7.1. However we met serveral times of
> internal error of MPI (see below for the messages).
I'm not familiar with Ls-Dyna, but it looks like your problem is with the
number of communicators you are creating. LAM/MPI has a hard limit of
around 4095 communicators (including MPI_COMM_NULL and MPI_COMM_WORLD).
It looks like you are hitting this hard limit.
It is not possible to increase this limit in LAM/MPI - it would require
extensive changes to the internal data structures of LAM. I would examine
the code to see if it is possible to reduce the the number of
communicators you are creating.
Hope this helps,
Brian
> MPI_Comm_create: internal MPI error: out of descriptors (rank 0,
> MPI_COMM_WORLD)
> MPI_Comm_create: internal MPI error: out of descriptors (rank 1,
> MPI_COMM_WORLD)
> MPI_Comm_create: internal MPI error: out of descriptors (rank 2,
> MPI_COMM_WORLD)
> MPI_Comm_create: internal MPI error: out of descriptors (rank 3,
> MPI_COMM_WORLD)
> Rank (0, MPI_COMM_WORLD): Call stack within LAM:
> Rank (0, MPI_COMM_WORLD): - MPI_Comm_create()
> Rank (0, MPI_COMM_WORLD): - main()
> Rank (2, MPI_COMM_WORLD): Call stack within LAM:
> Rank (2, MPI_COMM_WORLD): - MPI_Comm_create()
> Rank (2, MPI_COMM_WORLD): - main()
> Rank (3, MPI_COMM_WORLD): Call stack within LAM:
> Rank (3, MPI_COMM_WORLD): - MPI_Comm_create()
> Rank (3, MPI_COMM_WORLD): - main()
>
> The lam package (lam6.5.6-4) we have installed is a pre-configured one
> (lam-6.5.6-4.i386.rpm). My question is: shall we reconfigure this
> package with some new parameters, like --with-sysv=someting, and so on ...
>
> Could you give us the direction or the parameters with we can use (name
> and range, etc).
>
> Best regards,
>
>
> Kaiping Li
> Simulation Engineer_at_ASME DCX
>
>
--
Brian Barrett
LAM/MPI developer and all around nice guy
Have a LAM/MPI day: http://www.lam-mpi.org/
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