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Subject: Re: [OMPI devel] How to disable paffinity
From: Õž§ (iam.chilli_at_[hidden])
Date: 2010-08-12 23:35:12

Hi Ralph,Jeff and all

       It is a good news that I can almost run the openmpi on the vxworks
,but there are also still some bugs.The final test which has passed is:
      Rank 0 process calls mpi_send running on the host 0,rank 1 process
calls mpi_recv running on the host 1. It works well .For the absence of the
mmap in the vxworks ,which is used in the btl sm component , it still fails
running two processes in the same host.
      The difference between the vxworks and unix is the real trouble .For
example pipe(),fork(),exec(),socketpair(),fcntl() ,sshd and so no are not
implemented in the vxworks .Replacing these lost with the correspond
functions is the key work of the migration.After having a clear
understanding of the function of rsh component ,I write a simple daemon and
client to launch the orted for the calling of the rlogin() in the user space
of the vxworks complain.
      I think there are still many test needed to be launching .Maybe I'd
better to look into MTT.

ÔÚ 2010Äê7ÔÂ8ÈÕ ÉÏÎç9:54£¬Õž§ <iam.chilli_at_[hidden]>дµÀ£º

> Thank you ,Squyres , it is really useful !
> ÔÚ 2010Äê7ÔÂ7ÈÕ ÏÂÎç7:22£¬Jeff Squyres <jsquyres_at_[hidden]>дµÀ£º
>> On Jul 6, 2010, at 10:48 PM, Õž§ wrote:
>> > 1.If I write a rlogin component ,
>> Is the command line of rlogin that much different than that of rsh/ssh?
>> For example, can you just s/rsh/rlogin/ on the overall command line and
>> have it just work?
>> If so, I suspect that tweaking the rsh plm might be far simpler than
>> having your own component.
>> > can I just login in the node in the cluster and launch the process . If
>> it is ,what the role the odls plays ??
>> ODLS = ORTE Daemon Local launch Subsystem.
>> PLM = Process Lifecycle Management.
>> Meaning: the PLM is used to launch orteds (more on this below) across
>> multiple nodes. The ODLS is used to launch processes locally from the orted
>> (e.g., via POSIX fork/exec).
>> > 2.what is orted? Should the orted exists in every node and functions as
>> a node process launch proxy ?
>> Yes. The orted = ORTE daemon. It is almost always the first thing
>> launched on each node and acts as a proxy for launching, killing, and
>> monitoring the user's applications on each node. It also does other control
>> kinds of things, like relay stdout/stderr back up to the HNP (more below),
>> etc.
>> > 3,what is hnp ? Is every job has only one hnp ,and when I use mpirun ,
>> the mpirun process is hnp ??
>> HNP = head node process, meaning mpirun (or actually, orterun -- mpirun is
>> a symlink to orterun). The HNP functions as an orted as well, so it can use
>> the ODLS to launch processes locally, etc.
>> Ralph can provide more detail on all of the above, but these are the
>> basics.
>> --
>> Jeff Squyres
>> jsquyres_at_[hidden]
>> For corporate legal information go to:
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>> devel mailing list
>> devel_at_[hidden]
> --
> Õž§