Re: [Chicken-users] mpi egg - MPI:init error

[Arthur Maciel]

Thank you, Ivan! I really didn't understand the example, but now it is much more clear to me!

Best wishes,
Arthur

2013/4/7 Ivan Raikov <address@hidden>

 By the way, I realized that the example in the MPI egg documentation may not be all that clear, so I have updated it and added some comments.

This is a very simple example of a master/worker pattern. You are welcome to improve on this with larger data sets or CPU-intensive operations.

  -Ivan

On Fri, Mar 29, 2013 at 11:44 PM, Arthur Maciel <address@hidden> wrote:

Ivan, thank you for the info.

Indeed I don't program anything serious enough to need parallelizing. I am just curious about how far I can get with Chicken. I've seen it doesn't support native threads and I was a bit worried because I thought that 'production' languages for real world tasks should provide them. But now I see there is another way around with the MPI egg.

I'm a constant beginner when talking to programming and I'm very curious about PL, especially Chicken Scheme, but almost never I get my hands dirty with code.

I really understand what you mean by high level abstractions over basic MPI functionality, but I don't know how to do it. However, I'm quite excited to know Chicken and FPL in more depth and I would like to help on any useful task. When you intend to develop it more, please count on me.

Best wishes,

Arthur

Em 29/03/2013 03:51, "Ivan Raikov" <address@hidden> escreveu:

Hi Arthur,

     I use mpi for parallelizing some moderately-sized number crunching tasks (kd-tree queries over trees of size ~1e5 points. I have primarily used the scatter/gather collective operations for this. Of course, MPI is a bit low-level for a functional programming language, and one day I hope to develop some high level abstractions over the basic MPI functionality. If you have some idea what kind of concurrent patterns you want to use in your application, I can suggest which MPI functions may be of use to you.

  -Ivan

On Fri, Mar 29, 2013 at 9:49 AM, Arthur Maciel <address@hidden> wrote:

Hello!

I'm on:
Linux Mint 3.5.0-17-generic #28-Ubuntu SMP Tue Oct 9 19:31:23 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
Chicken Scheme Version 4.8.0.1 (stability/4.8.0) (rev 54c391c)
linux-unix-gnu-x86-64 [ 64bit manyargs dload ptables ]
compiled 2013-01-17 on aeryn.xorinia.dim (Darwin)

libopenmpi-dev is installed and chicken-install compiled mpi perfectly.

But when I run  'csi -e "(use srfi-4 mpi) (MPI:init)"' I get exactly the same error as the one in salmonella report at http://tests.call-cc.org/master/linux/x86/2013/03/28/salmonella-report/test/mpi.html

I don't know how to make it work. Any help is appreciated.

BTW, I've got to mpi from http://wiki.call-cc.org/man/4/faq#does-chicken-support-native-threads, but I've seen it is not used by any other egg. Is it really useful to parallel programming?

Best wishes,
Arthur



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