[racket] remote tasks

From: Kevin Tew (tewk at cs.utah.edu)
Date: Mon May 14 13:18:21 EDT 2012

Attached is a distributed places program that will do what you want.

It requires the latest checkout from git head.
You must have ssh public-key authentication setup on all the nodes.
For easy use, it also requires that racket and remote-eval.rkt be 
installed in the same place on all three machines.
It communicates with plain sockets, so it assumes a secure environment.

Let me know what problems you have or if it works for you.
I would start by testing it out using just localhost.

Kevin Tew

On 05/13/2012 01:53 PM, HP Wei wrote:
> Would you please suggest to me some links so that I can
> get some info or even better some sample racket codes for below task ?
> -------------------------------------------------------
> Suppose I am on a master machine A
> and there are two other machines B and C.
> On A,  in racket,  I would like to programatically initiate
> one server on B and another on C.
> The 'server' is presumably a 'repl' that can execute a block
> of code, sent from A.
> [ Let's say security is not an issue here. ]
> i.e. this is the intention:
>     invoke-server-on B  and C  (via rsh or ssh)
>     send-code B   (asynchronously)
>     send-code C   (asynchronously)
>     wait-for-result-from B and C
>     ...
>     kill-server-on B and C
> thanks
> HP
> ____________________
>  Racket Users list:
>  http://lists.racket-lang.org/users

-------------- next part --------------
#lang racket/base
(require racket/place/distributed

(define-namespace-anchor a)
(define ns (namespace-anchor->namespace a))

  (define-rpc (evalit x) (eval x ns)))

(module+ main
  (define node-addresses (list (list "localhost" 6341)
                               (list "localhost" 6342)))

  (define nodes
    (spawn-nodes/join/local node-addresses))

  (for ([n nodes])
    (supervise-named-dynamic-place-at n 'echo (quote-module-path "..") 'make-echo-server))

  (define-values (mrth mrch)
      #:nodes nodes))

  (define thread-channels
    (for/list ([na node-addresses])
      (define remote-place-ch (mr-connect-to mrch na 'echo))
      (define thread-ch (make-channel))
        (lambda ()
          (channel-put thread-ch
                       (echo-server-evalit remote-place-ch 
                                           `(format "Hello from ~a ~a" 
                                                    (quote ,na) 
                                                    (date->string (current-date)))))))
  (for ([ch thread-channels])
      (printf "~v\n" (channel-get ch))))

Posted on the users mailing list.