Lujie,
On Jan 22, 2007, at 12:39 PM, Lujie Zhan wrote:
> Hi Tim,
>
> Thanks for help! Sorry my reply is a little late since I was tring
> something... It works once I use "-s n0".
>
> No matter what directory is, and whether it is in $PATH, "mpirun"
> always needs -s. How come?
-s preloads the binary for you, so it doesn't have to be on all the
nodes. This is helpful if you don't have a shared filesystem (which
it sounds like your situation). So it uses the $PATH on n0, but no
where else.
> Does it find binary since "." is in $PATH? So I don't need set
> $PATH as the faq says? How to use mpirun without -s?
By making sure your executable is on each node and in your path (or
you give an absolute path to mpirun).
>
> The second situation is most confusing, it does work if I copy the
> binary to the same directory on all nodes, withouth "-s" or
> changing $PATH. Does this mean that "mpirun" invokes the binary
> from every nodes themselves, not copies from master to salves?
Correct. By default lam will execute your binary from the executable
found on each node.
Tim
>
> Now it seems the problem is focused on "-s", doesn't it?
>
>
> On 1/21/07, Tim Prins <tprins_at_[hidden]> wrote: Hi Lujie,
>
> On Sunday 21 January 2007 04:36 pm, Lujie Zhan wrote:
> > Hi all,
> >
> > I'm using LAM-6.5.9 in the lab, and "lamboot -v" correctly from
> master
> > machine onto other two machines.
> >
> > The weird thing is, only if I created same folder and copied the
> binary
> > file to this folder, which is in the same path on other slave
> machines as
> > on the master machine, like "/home/class4171/mpi_test/", I could
> execute
> > "mpirun -np NUM test". Otherwise, either I didn't copy the file
> or I use
> > different path or folder name, it complained that "...no such
> file or
> > directory".
> LAM is telling you it cannot find your program executeable. In
> order for LAM
> to find your program 2 things must be true:
> 1. It exists on all nodes
> 2. it is either in your $PATH or an absolute pathname is passed. See
> http://www.lam-mpi.org/faq/category5.php3#question11 for an
> explanation of
> how LAM finds executeables on the nodes.
>
> Hope this helps,
>
> Tim Prins
>
> >
> > And there is no problem that I run "ssh" or "scp" from master to
> any slave
> > machines, and no need for password. So I really don't know what
> is the
> > problem.
> >
> > Thanks,
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>
>
> --
> Lujie
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