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Execute the garbage collector only on the eval breaker #97922

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pablogsal opened this issue Oct 5, 2022 · 1 comment
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Execute the garbage collector only on the eval breaker #97922

pablogsal opened this issue Oct 5, 2022 · 1 comment

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@pablogsal
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pablogsal commented Oct 5, 2022

Currently, the GC can be executed on every object allocation. This has been historically the source of many problems because it can trigger a GC run in points where the VM is in an inconsistent state. This includes critical points of the eval loop but also during complex object creation since the GC can run while creating sub-elements of the final result meanwhile the object is not fully initialized.

To improve the situation, we can schedule a GC run on object allocation but the GC will only run then on the eval breaker in a similar fashion we currently use to run signal handlers, do GIL switch and run pending callbacks.
@bedevere-bot bedevere-bot mentioned this issue Oct 5, 2022
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@pablogsal
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pablogsal commented Oct 5, 2022

One small consideration:

We can opportunistically check if the GC is scheduled to run and run it if we have a request in PyErr_CheckSignals. This can benefit native code that needs to call PyErr_CheckSignals if is going to run for some time without executing Python code to ensure signals are handled. Checking for the GC here allows long-running native code to clean cycles created using the C-API even if it doesn't run the evaluation loop

pablogsal added a commit that referenced this issue Oct 8, 2022
@pablogsal
gh-97922: Run the GC only on eval breaker (#97920)
83eb827
carljm added a commit to carljm/cpython that referenced this issue Oct 8, 2022
@carljm
Merge branch 'main' into typewatch
d67d6fd 
* main:
  pythongh-68686: Retire eptag ptag scripts (python#98064)
  pythongh-97922: Run the GC only on eval breaker (python#97920)
  GitHub Workflows security hardening (python#96492)
  Add `@ezio-melotti` as codeowner for `.github/`. (python#98079)
  pythongh-97913 Docs: Add walrus operator to the index (python#97921)
  [doc] Fix broken links to C extensions accelerating stdlib modules (python#96914)
  pythongh-97822: Fix http.server documentation reference to test() function (python#98027)
  pythongh-91052: Add PyDict_Unwatch for unwatching a dictionary (python#98055)
  pythonGH-98023: Change default child watcher to PidfdChildWatcher on supported systems (python#98024)
  pythonGH-94182: Run the PidfdChildWatcher on the running loop (python#94184)
carljm added a commit to carljm/cpython that referenced this issue Oct 9, 2022
@carljm
Merge branch 'main' into urllibnonet
132c32e 
* main: (5519 commits)
  Minor edits to the Descriptor HowTo Guide (pythonGH-24901)
  Fix link to Lifecycle of a Pull Request in CONTRIBUTING (python#98102)
  pythonGH-94597: deprecate `SafeChildWatcher`, `FastChildWatcher` and `MultiLoopChildWatcher` child watchers  (python#98089)
  Auto-cancel old builds when new commit pushed to branch (python#98009)
  pythongh-95011: Migrate syslog module to Argument Clinic (pythonGH-95012)
  pythongh-68686: Retire eptag ptag scripts (python#98064)
  pythongh-97922: Run the GC only on eval breaker (python#97920)
  GitHub Workflows security hardening (python#96492)
  Add `@ezio-melotti` as codeowner for `.github/`. (python#98079)
  pythongh-97913 Docs: Add walrus operator to the index (python#97921)
  [doc] Fix broken links to C extensions accelerating stdlib modules (python#96914)
  pythongh-97822: Fix http.server documentation reference to test() function (python#98027)
  pythongh-91052: Add PyDict_Unwatch for unwatching a dictionary (python#98055)
  pythonGH-98023: Change default child watcher to PidfdChildWatcher on supported systems (python#98024)
  pythonGH-94182: Run the PidfdChildWatcher on the running loop (python#94184)
  pythongh-92886: make test_ast pass with -O (assertions off) (pythonGH-98058)
  pythongh-92886: make test_coroutines pass with -O (assertions off) (pythonGH-98060)
  pythongh-57179: Add note on symlinks for os.walk (python#94799)
  pythongh-94808: Fix regex on exotic platforms (python#98036)
  pythongh-90085: Remove vestigial -t and -c timeit options (python#94941)
  ...
mpage pushed a commit to mpage/cpython that referenced this issue Oct 11, 2022
@pablogsal @mpage
pythongh-97922: Run the GC only on eval breaker (python#97920)
65d36ba
@markshannon markshannon mentioned this issue Oct 14, 2022
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@vstinner vstinner mentioned this issue Nov 9, 2022
Merged
@vstinner vstinner mentioned this issue Nov 24, 2022
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