HOMEWORK - Due to January 10, 2011

1. Threads; Computing the value of $\pi$. The following http://siber.cankaya.edu.tr/ozdogan/ParallelComputing/cfiles/code24.c program computes the value of the $\pi$ number by a given number of threads;
   • Analyze the code for the possible synchronization issues.
   • Compile and execute the code by increasing the number of the threads and number of the intervals.
   • Make the following procedures:
     • Draw a figure as Execution Time vs Number of Threads.
       • If you increase the number of threads as the multiple of 2, then take the $ln$.
       • If you increase the number of threads as the multiple of 10, then take the $log$.
     • Make the Speed-Up and Efficiency analysis.
2. Modify the loop work-sharing OpenMP http://siber.cankaya.edu.tr/ozdogan/ParallelComputing/cfiles/code26.c program as printing out
   • local sums of array C
   • global sum of array C using $reduction(+: sum)$ clause