Hi, I'm trying to leverage my instance's entire vCPU (8 vCPUs) to perform OCR on PDFs. My code works locally, but when I try to use the CPUs on my fastapi python railway instance, it never goes past 1 vCPU and it claims CPU usage is 0%. How can I get multi processing to work?

• I'm using python, fastapi, pytesseract, psutil and ProcessPoolExecutor

          with concurrent.futures.ProcessPoolExecutor(max_workers=max_workers) as executor:
              futures = {executor.submit(process_page_wrapper, page_args): idx for idx, page_args in enumerate(page_args)}
              for future in concurrent.futures.as_completed(futures):
                  idx = futures[future]
                  try:
                      processed_page = future.result()
                      result[idx]= processed_page
                      logging.info(f"processed_page {idx} successfully")
                  except Exception as e:
                      logging.error(f"Failed to process processed_page {idx}: {e}")