I had the impression that she wants something more elaborate than that.
But sure, if Yan had a way of finding out the IP address for each node,
she could build a reverse table on her own.
Igor
Stephen Fink/Watson/i...@ibmus wrote on 12/10/2010 12:04:40 PM:
> I'd suggest that Li Yan wants an X10 equivalent of java.net.InetAddress.
> Since we have permission to port libraries from Harmony, we can put this
> on the list of desired classes.
>
> I'll open a JIRA feature request for this.
>
> SJF
> ------------------------------------------------------------------------
> Stephen Fink
> IBM T.J. Watson Research Center
> sjf...@us.ibm.com
> (914)784-7776
>
>
>
>
> From:
> Igor Peshansky/Watson/i...@ibmus
> To:
> Mailing list for users of the X10 programming language
> <x10-users@lists.sourceforge.net>
> Cc:
> Yan CRL Li <liyan...@cn.ibm.com>, Qi Ming Teng <teng...@cn.ibm.com>
> Date:
> 12/10/2010 08:28 AM
> Subject:
> Re: [X10-users] How to Map IP address to Place ID
>
>
>
> Yan CRL Li <liyan...@cn.ibm.com> wrote on 12/10/2010 05:35:06 AM:
>
> > For this scenario, I know the IP address of each node, I want to know
> each
> > Place id corresponding to this IP.
> >
> > For example :I put different files on these nodes. I start 5 places on
> two
> > physical nodes:
> > File A, File B are on node 1 with IP: 192.168.1.1
> > FileC,File D and File E anre on node 2 with IP :192.168.1.2
> >
> > When I access these Files, I need to know the mapping relationship
> between
> > Place ID and IP address.
> >
> > But when programming with X10, I only know the place id, I do not know
> > which node is mapping to this id, how can I do this ?
>
> Yan,
>
> The mapping of places to nodes is external to X10.
>
> When you launch using the sockets or MPI transport, you specify the host
> list
> as one of the parameters. The hosts will be picked out of the host list
> in a
> round-robin fashion, so you know exactly which host corresponds to which
> place.
>
> If you use an external launcher, e.g., SLURM, you would have to look at
> the
> documentation for that system to see how to force it to use particular
> nodes
> as specific places.
>
> The usual approach is to have a shared filesystem, put all 5 files on
it,
> and let each node access the file that corresponds to its place. I
> realize
> that the files may be too large for this to be immediately feasible, but
> disk space is cheap, and it may end up being the most general solution.
> Igor
--
Igor Peshansky (note the spelling change!)
IBM T.J. Watson Research Center
X10: Parallel Productivity and Performance (http://x10-lang.org/)
XJ: No More Pain for XML's Gain (http://www.research.ibm.com/xj/)
"I hear and I forget. I see and I remember. I do and I understand" --
Xun Zi
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