old_contents: import os
  import time
  import multiprocessing
  
  threads = 4
  
  dev_null = "/dev/null"
  input_dir = "./convergence_inputs/"
  
  log_file = dev_null
  
  call = "nice -n 19 ionice -c2 -n7 ../build/main.x "
  call_end = " >> " + log_file
  
  syscall_arr = []
  
  input_files = os.listdir(input_dir)
  
  if __name__ == "__main__":
     pool = multiprocessing.Pool(processes=threads)
  
     for fname in input_files:
        inp_path = input_dir + fname
        syscall = call + inp_path + call_end
        syscall_arr.append(syscall)
  
     if log_file is not dev_null:
        os.remove(log_file)
  
     start_time = time.time()
  
     pool.map(os.system, syscall_arr)
  
     pool.close()
     pool.join()
  
     end_time = time.time()
  
     print("Runtime: ", end_time-start_time)
  
new_contents: import os
  import time
  import multiprocessing
  
  threads = 4
  
  os.environ["OMP_NUM_THREADS"] = "1"
  
  dev_null = "/dev/null"
  input_dir = "./convergence_inputs/"
  
  log_file = "log.log"
  
  call = "nice -n 19 ionice -c2 -n7 ../build/main.x "
  call_end = " >> " + log_file
  
  syscall_arr = []
  
  input_files = os.listdir(input_dir)
  
  if __name__ == "__main__":
     pool = multiprocessing.Pool(processes=threads)
  
     for fname in input_files:
        inp_path = input_dir + fname
        syscall = call + inp_path + call_end
        syscall_arr.append(syscall)
  
     if log_file is not dev_null:
        try:
           os.remove(log_file)
        except:
           pass
  
     start_time = time.time()
  
     pool.map(os.system, syscall_arr)
  
     pool.close()
     pool.join()
  
     end_time = time.time()
  
     print("Runtime: ", end_time-start_time)
  
subject: Update parallel convergence test runs to not spawn OMP threads