DM-47482: Remove explicit garbage collection

.github/workflows/build.yaml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.11", "3.12"]
+        python-version: ["3.11", "3.12", "3.13"]
 
     steps:
       - uses: actions/checkout@v4

.pre-commit-config.yaml

@@ -1,13 +1,13 @@
 repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v4.6.0
+    rev: v5.0.0
     hooks:
       - id: check-yaml
       - id: end-of-file-fixer
       - id: trailing-whitespace
       - id: check-toml
   - repo: https://github.com/psf/black-pre-commit-mirror
-    rev: 24.8.0
+    rev: 24.10.0
     hooks:
       - id: black
         # It is recommended to specify the latest version of Python
@@ -22,7 +22,7 @@ repos:
         name: isort (python)
   - repo: https://github.com/astral-sh/ruff-pre-commit
     # Ruff version.
-    rev: v0.6.2
+    rev: v0.7.3
     hooks:
       - id: ruff
   - repo: https://github.com/numpy/numpydoc

doc/changes/DM-47482.misc.md

@@ -0,0 +1,2 @@
+Remove explicit calls to garbage collector during in-process execution.
+Garbage collection can be slow and it is not useful in our common use cases.

python/lsst/ctrl/mpexec/mpGraphExecutor.py

@@ -29,7 +29,6 @@
 
 __all__ = ["MPGraphExecutor", "MPGraphExecutorError", "MPTimeoutError"]
 
-import gc
 import importlib
 import logging
 import multiprocessing
@@ -596,11 +595,6 @@ def _executeQuantaInProcess(self, graph: QuantumGraph, report: Report) -> None:
                         qnode.quantum.dataId,
                         exc_info=exc,
                     )
-            finally:
-                # sqlalchemy has some objects that can last until a garbage
-                # collection cycle is run, which can happen at unpredictable
-                # times, run a collection loop here explicitly.
-                gc.collect()
 
             _LOG.info(
                 "Executed %d quanta successfully, %d failed and %d remain out of total %d quanta.",