https://github.com/python/cpython/commit/e3564689a59886f347e0b44d5296320d9fdd9039
commit: e3564689a59886f347e0b44d5296320d9fdd9039
branch: main
author: Tian Gao <gaogaotiant...@hotmail.com>
committer: gaogaotiantian <gaogaotiant...@hotmail.com>
date: 2025-03-20T20:31:55-04:00
summary:
gh-120144: Disable the CALL event when possible to achieve zero overhead pdb
(#131390)
files:
A Misc/NEWS.d/next/Library/2025-03-18-02-11-33.gh-issue-120144.dBLFkI.rst
M Lib/bdb.py
diff --git a/Lib/bdb.py b/Lib/bdb.py
index d32a05f59ad692..ba5cacc2a54cbc 100644
--- a/Lib/bdb.py
+++ b/Lib/bdb.py
@@ -342,7 +342,12 @@ def dispatch_call(self, frame, arg):
self.botframe = frame.f_back # (CT) Note that this may also be
None!
return self.trace_dispatch
if not (self.stop_here(frame) or self.break_anywhere(frame)):
- # No need to trace this function
+ # We already know there's no breakpoint in this function
+ # If it's a next/until/return command, we don't need any CALL event
+ # and we don't need to set the f_trace on any new frame.
+ # If it's a step command, it must either hit stop_here, or skip the
+ # whole module. Either way, we don't need the CALL event here.
+ self.disable_current_event()
return # None
# Ignore call events in generator except when stepping.
if self.stopframe and frame.f_code.co_flags &
GENERATOR_AND_COROUTINE_FLAGS:
diff --git
a/Misc/NEWS.d/next/Library/2025-03-18-02-11-33.gh-issue-120144.dBLFkI.rst
b/Misc/NEWS.d/next/Library/2025-03-18-02-11-33.gh-issue-120144.dBLFkI.rst
new file mode 100644
index 00000000000000..35d577e235102f
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-03-18-02-11-33.gh-issue-120144.dBLFkI.rst
@@ -0,0 +1 @@
+Disable ``CALL`` event in :mod:`bdb` in ``monitoring`` backend when we don't
need any new events on the code object to get a better performance.
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