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I would like to start to parallelize my Java code. This is my toy-problem. I have two vectors (double []) containing respectively the height and the base of several triangles. I have a class, Triangle, containing a method, computeArea, that computes the area of a triangle (height*base/2). For each triangle I have I want to store the area in a third vector (double []). Currently I have a for loop like this

for(int i=0; i<height.length; i++){
    
    area[i] = triangle.computeArea(height[i], base[i]);

}

Some suggestion on how to parallelize the code? Could you kindly provide me a simple example? I am using jdk 1.8. Please note that the values in the vector area must correspond to values in vectors height and base.

Thanks in advance

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  • Does this answer your question? Java 8: Parallel FOR loop Commented Mar 1, 2022 at 7:50
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    Arrays.parallelSetAll(area, i -> triangle.computeArea(height[i], base[i])); Commented Mar 1, 2022 at 7:57
  • Thanks for your suggestions. I tried, but it seems to be slower compare to the for loop. I measured the time with System.currentTimeMillis(). Is there a better solution or what I am doing wrong? ``` double t = System.currentTimeMillis(); for(int k=0; k<KMAX; k++) { area[k] = tr.computeArea(height[k], base[k]); } double seq = System.currentTimeMillis() - t; t = System.currentTimeMillis(); Arrays.parallelSetAll(area, i -> tr.computeArea(height[i], base[i])); seq = System.currentTimeMillis() - t; with the for loop I get 170 while 230 with Arrays.parallelSetAll Commented Mar 1, 2022 at 11:27
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