[Python-Dev] funny leak (original) (raw)

Neal Norwitz neal@metaslash.com
Mon, 24 Mar 2003 08:43:16 -0500

On Mon, Mar 24, 2003 at 01:40:44PM +0100, Christian Tismer wrote:

I just tested generators and found a memory leak. (Has nothing to do with generators). The following code adds one to the overall refcount and gc cannot reclaim it. def conjoin(gs): def gen(): gs # unbreakable cycle gen # unless one is commented out

With current CVS:

    >>> gc.collect()
    0
    [23150 refs]
    >>> conjoin(1)
    [23160 refs]
    >>> conjoin(1)
    [23170 refs]
    >>> gc.collect()
    8
    [23151 refs]
    >>> conjoin(1)
    [23161 refs]
    >>> conjoin(1)
    [23171 refs]
    >>> gc.collect()
    8
    [23151 refs]
    >>> conjoin(1)
    [23161 refs]
    >>> conjoin(1)
    [23171 refs]
    >>> gc.collect()
    8
    [23151 refs]

One ref may be leaked the first time gc.collect() is called with garbage (23150 -> 23151). But after that, no more refs are leaked (ref count stays at 23151).

Neal