CODEWITHSUNDEEP
copenmp
CrashingTurttles
CrashingTurttles

Reputation: 9

OpenMP parallelize a random sequence

I want to parallelize a loop that have a sequence of random numbers generated by the function erand48. The order of the sequence is important so I can't change it. I tried this:

   #pragma omp parallel for
   for(int i=0; i<5; i++){
       printf("%f \n",erand48(vector));
   }

But the order of the sequence changed. Any suggestion??

Upvotes: 0

Views: 161

Answers (1)

1201ProgramAlarm
1201ProgramAlarm

Reputation: 32717

If the order of execution is important, you can't parallelize the loop. When it is parallelized, the 2nd iteration could run before the 1st one.

You could generate all of your random numbers, store those in an array, then run the parallel loop accessing the array.

Upvotes: 1

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