how to run workflow on Htcass?

Asked by Hieu Vu on 2013-12-31

Hi,

I have a simple task to calculate Pi (3,14...) on Htcaas.

The algorithm is:
Assume the center of a cycle is (0,0) and r = 1, consider the quarter whose x > 0 and y > 0
The area of the quarter is pi/4
Consider the square whose 4 points are (0,0), (0,1), (1,1) and (1,0)
The area of the square is 1
Consider point A (x, y); 0 < x, y < 1
The possibility that A is located inside the cycle = the area of the quarter / the area of the square = pi/4

A is located inside the cycle iff (x^2 + y ^2 <= 1 (which is r^2))

The serial version of the algorithm is:
  int numSample = 100000;
  int numPointInsideRound = 0;
  for (int i = 0; i < numSample; i++){
   double x = Math.random();
   double y = Math.random();
   double distanceSquare = (x*x) + (y*y);
   if (distanceSquare < 1){
    numPointInsideRound++;
   }
  }
// result = pi
  double result = (double) (numPointInsideRound*4) / numSample;
  System.out.println(result);

The result on my PC is pi = 3.14164
Now I want to create a parallel, parameter sweep version of the algorithm and submit to Htcaas, somehow like this:

  double x = Math.random();
  double y = Math.random();
  double distanceSquare = (x*x) + (y*y);
                if (distanceSquare < 1){
                      System.out.println("1")
                } else {
                      System.out.println("0")
                }

The question is, if I submit this program, for example 1000 times, then I will get 1000 output files.
I don't want to retrieve these 1000 output file to my PC to process. Instead, I want to do "something more" on Htcaas before getting the final result.

How can I do it?

Hieu

Question information

Language:
English Edit question
Status:
Answered
For:
HTCaaS Edit question
Assignee:
No assignee Edit question
Last query:
Last reply:
Revision history for this message
SEUNGWOO RHO (seungwoo0926) said :
#1

hm.. currently, we don't support workflow like that.

so, I think you should find another solution to do it.

One thing is, in my opinion, to make another job script for postprocessing.

Can you help with this problem?

Provide an answer of your own, or ask Hieu Vu for more information if necessary.

To post a message you must log in.