From e72cedfa052e016c8d3c87002a193f2f5d7bfc7d Mon Sep 17 00:00:00 2001
From: Andreas Kloeckner <inform@tiker.net>
Date: Fri, 23 Feb 2018 23:22:42 -0600
Subject: [PATCH] Force GC before MinRecursionLimit exits

---
 pytools/__init__.py | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/pytools/__init__.py b/pytools/__init__.py
index a9c58ce..25881d5 100644
--- a/pytools/__init__.py
+++ b/pytools/__init__.py
@@ -1939,6 +1939,18 @@ class MinRecursionLimit(object):
         sys.setrecursionlimit(new_limit)
 
     def __exit__(self, exc_type, exc_val, exc_tb):
+        # Deep recursion can produce deeply nested data structures
+        # (or long chains of to-be gc'd generators) that cannot be
+        # undergo garbage collection with a lower recursion limit.
+        #
+        # Force a garbage collection while the recursion limit is
+        # still high to avoid this situation.
+        #
+        # See https://gitlab.tiker.net/inducer/sumpy/issues/31 for
+        # context.
+        import gc
+        gc.collect()
+
         sys.setrecursionlimit(self.prev_recursion_limit)
 
 # }}}
-- 
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