explicitly collect GC

Author: brettlangdon

benchmarks/bm/_scenario.py

@@ -1,6 +1,7 @@
 import abc
 import cProfile
 import dataclasses
+import gc
 import os
 import time
 import typing
@@ -87,6 +88,7 @@ def run(self) -> typing.Generator[typing.Callable[[int], None], None, None]:
         pass
 
     def _pyperf(self, loops: int) -> float:
+        gc.collect()
         rungen = self.run()
         run = next(rungen)
         t0 = time.perf_counter()
@@ -97,4 +99,6 @@ def _pyperf(self, loops: int) -> float:
             next(rungen)
         except StopIteration:
             pass
+        finally:
+            gc.collect()
         return dt