Working with OpenMP Directives in the ROSE AST - Exam

Evaluate Your Understanding

The purpose of this exam is to evaluate your understanding of working with OpenMP directives with ROSE.

This is a “closed-book” test and the terminal has been removed. Write your code in the text editor and click the “Build” button to have the server compile your solution. Any errors will show in the console view. If the build is successful, click the “Run” button to have your submission graded.

Task

Implement a ROSE translator that traverses the AST and counts the number of OpenMP mapped variables (OpenMP map clause) for GPU offloading. This clause is used for GPU offloading in OpenMP and controls data movement between devices (e.g., between CPU and GPU). Counting how many variables are offloaded be useful in determining the extent of offloading in large-scale OpenMP programs.

Example input with one such variable runningOnGPU:

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#include <stdio.h>
#include <omp.h>

int check_gpu_support()
{
  int runningOnGPU = 0;

  /* Test if GPU is available */
  #pragma omp target map(from:runningOnGPU)
  {
    // This function returns true if running on the host device, false otherwise.
    if (!omp_is_initial_device())
      runningOnGPU = 1;
  }

  return runningOnGPU;
}