Dear List,
Thank you for your support till now, but I have several questions again
about communication between processes;
1) I was trying out something in my code :
vector(0).copyTo(0, matrixTasks(1).getSubVector() ,0,vector(0).length());
obviously "vector(0)" and "getSubVector()" return a Rail type, so basically
I'm just trying to copy the data in the rail
that is resident at vector(0) (at place 0) to the Rail that is resident at
the SubVector (at place 1) but I get an bad place exception
so when I tried:
vector(0).copyTo(0, at(Place.place(1)) {matrixTasks(1).getSubVector()}
,0,vector(0).length());
it works pretty fine, no bad exceptions, so do I have to specify the place
of the destination rail? and what happened under the hoods in the
last code snippet?, because maybe it would be inefficient in terms of
performance as I dont know whats really happening.
2) the "ateach" keyword, does it spawn a new activity in every iteration in
the specified place?
3) if I were to use the "atomic" keyword, what is its granularity in terms
of accessing an Array or Rail or whatever, is the whole Array
locked or the indexed element only locked?
4) So basically, you told me that I'll have to implement the One-To-All
broadcast and All-To-One reduction, but doesn't that mean
that I have to know the structure of the underlying architecture, for
example if I want to implement a hypercube broadcast I need to
know which nodes are connected to each other and in which topology to
implement an efficient broadcast. I don't think that X10
provides this kind of information (its hidden from the programmer)
Example:
A--B--C
| |
D--E--F
so If I want to broadcast from A to all it could go on like this
1) A to F
2) A to D and F to C
3) C to B and D to E
so basically these nodes represent Places that I don't know how they are
interconnected, because its hidden.
to recap, my question is how to implement broadcast and reduction in X10
efficiently??
Thank you all,
Regards,
Mohammed, KAUST and TUM
On Wed, Jul 14, 2010 at 1:17 PM, David P Grove <gro...@us.ibm.com> wrote:
>
>
>
> mohammed elsaeedy <mohammed.elsae...@kaust.edu.sa> wrote on 07/13/2010
> 11:33:40 AM:
>
> >
> > Thank you David and Igor for the clarifications, so that was for BG, but
> > what if I want to deploy over a traditional cluster,
> > how can I do that?
> >
>
> Sorry, missed that part of the question. If you want to deploy over a
> traditional cluster, compile using x10c++. You can then use your cluster's
> job management tool (loadleveler, mpirun, etc) to execute the resulting
> executable over the cluster as if it were a mpi program. For what it's
> worth, I've used LoadLeveler on shaheenx to run X10 programs successfully a
> few months ago. I've appended the config file I used for that for
> reference (this was several months ago, so it might be out of date, but I
> think the same ideas should still work).
>
> --dave
>
> #!/bin/sh
> #
> # @ account_no = <your account here>
> # @ job_name = NQueensDistx10
> # @ job_type = mpich
> # @ output = $(job_name).out
> # @ error = $(job_name).err
> # @ environment = COPY_ALL;
> # @ wall_clock_limit = 00:05:00
> # @ notification = never
> # @ node = 16
> # @ tasks_per_node = 1
> # @ class = default
> # @ queue
>
> cd $HOME/x10-trunk/x10.dist/samples
> echo "BOOTING"
> mpdboot -f $LOADL_HOSTFILE
> echo "LAUNCHING"
> mpiexec -np 16 ./NQueensDist.mpi 12
> echo "DONE"
> mpdallexit
>
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--
Thank you for your concern.
Regards,
Mohammed El Sayed
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