diff -r 8cd317c033b8 -r 1574718fa62f mercurial/profiling.py
--- a/mercurial/profiling.py	Sun Apr 14 02:33:36 2024 +0200
+++ b/mercurial/profiling.py	Sun Apr 14 02:36:55 2024 +0200
@@ -70,6 +70,7 @@
             stats = lsprof.Stats(p.getstats())
             stats.sort(pycompat.sysstr(field))
             stats.pprint(limit=limit, file=fp, climit=climit)
+        fp.flush()
 
 
 @contextlib.contextmanager
@@ -97,14 +98,15 @@
     finally:
         thread.stop()
         thread.join()
-        print(
-            b'Collected %d stack frames (%d unique) in %2.2f seconds.'
-            % (
+        m = b'Collected %d stack frames (%d unique) in %2.2f seconds.'
+        m %= (
+            (
                 util.timer() - start_time,
                 thread.num_frames(),
                 thread.num_frames(unique=True),
-            )
+            ),
         )
+        print(m, flush=True)
 
 
 @contextlib.contextmanager
@@ -170,6 +172,7 @@
             kwargs['showtime'] = showtime
 
         statprof.display(fp, data=data, format=displayformat, **kwargs)
+        fp.flush()
 
 
 class profile: