Add RAYON_NUM_THREADS environment variable support to benchmark output

Author: kosiew

benchmarks/collect_gil_bench.py

@@ -290,8 +290,10 @@ def run(
     )
     args = parser.parse_args()
 
+    import os
+    rayon_threads = os.environ.get('RAYON_NUM_THREADS', 'default')
     print(f"\n\nRunning benchmark with {args.batches} batches, {args.batch_size} rows per batch")
-    print(f"Partitions: {args.partitions or args.batches}, Workload: {args.workload}")
+    print(f"Partitions: {args.partitions or args.batches}, Workload: {args.workload}, RAYON_NUM_THREADS: {rayon_threads}")
     print("-" * 60)
 
     run(