[ python-Bugs-980419 ] int left-shift causes memory leak
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Sat Jun 26 20:01:16 EDT 2004
Bugs item #980419, was opened at 2004-06-26 15:36
Message generated for change (Comment added) made by rhettinger
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Category: Python Interpreter Core
Group: Python 2.4
>Status: Closed
>Resolution: Fixed
Priority: 6
Submitted By: Erik Demaine (edemaine)
Assigned to: Raymond Hettinger (rhettinger)
Summary: int left-shift causes memory leak
Initial Comment:
The following Python one-liner causes the Python image
size to grow quickly (beyond 100 megabytes within 10
seconds or so on my Linux 2.4.18 box on an Intel
Pentium 4):
while True: 1 << 64
The point is that 1 << 64 gets automatically turned
into a long. Somehow, even after all pointers to this
long disappear, it (or something produced along the
way) sticks around. The same effect is obtained by the
following more natural code:
while True: x = 1 << 64
There is an easy workaround; the following code does
not cause a memory leak:
while True: 1L << 64
However, a memory leak should not be intended behavior
for the new int/long unification.
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>Comment By: Raymond Hettinger (rhettinger)
Date: 2004-06-26 19:01
Message:
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Fixed. See Objects/intobject.c 2.111.
Thanks for the bug report.
----------------------------------------------------------------------
Comment By: Erik Demaine (edemaine)
Date: 2004-06-26 15:38
Message:
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user_id=265183
Forgot to mention that this arises even on the latest CVS
version of Python 2.4, and on other versions of Python 2.4 I
had lying around. It does not arise on Python 2.2, which is
pre-int/long unification I think.
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