René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"dict() resize failure","articleBody":"# Bug report\r\nWhen running under python 3.11.1, 3.11.2 and 3.12.a6, the dict() data structure fails to resize past 357913941 elements. This worked last (in what I have available) under python 3.10.8 and I can find no documentation that limits the size of a dict to a finite size. The system has \u003e512G of memory and this example easily fits in that memory.\r\n\r\nMy reproducer is mem.py:\r\n```python\r\nd=dict()\r\nfor a in range(500000000):\r\n    try:\r\n       d[a]=1\r\n    except:\r\n        print(a)\r\n        exit(0)\r\n```\r\noutput:\r\n357913941\r\n\r\nAs an aside (2^31)/3/2 = 357913941. It looks to me like there is an int32 in the code that's trying to represent the size of the dict. (GROWTH_FACTOR=3) I'm not sure where the extra factor of 2 is coming from yet.\r\n\r\n\r\nSimplest reproducer is:\r\n```python\r\nd=dict()\r\nfor a in range(500000000):\r\n       d[a]=1\r\n ```\r\noutput:\r\n    d[a]=1\r\n    ~^^^\r\nMemoryError\r\n\r\nexit code=1\r\n\r\n\r\n# Your environment\r\n\r\nI have tested on 3.10.8 (no failure) 3.11.1, 3.11.2, 3.12.a6 (fail)\r\nThis test must be run on a 64bit system with \u003e40G of RAM free. (I have not tested on a system with less memory but I assume an Out of Memory error from the OS will stop the python program before the dict() failure\u003e)\r\n\r\nTo reproduce I built the python with:\r\n```\r\n./configure --prefix=/mydir/python-3.12.a6 --enable-ipv6 --enable-shared --with-system-ffi --with-system-expat --with-ssl-default-suites=openssl --enable-optimizations\r\nmake -j\r\nmake install\r\nset PATH=/mydir/python-3.12.a6/bin:$PATH and LD_LIBRARY_PATH=/mydir/python-3.12.a6/lib\r\npython3 mem.py\r\n```\r\n\r\nIn pyconfig.h\r\nSIZEOF_VOID_P = 8\r\nSIZEOF_SIZE_T = 8\r\n\r\nOS:\r\nRed Hat Enterprise Linux release 8.7 (Ootpa)\r\n\r\ncat /proc/meminfo \r\nMemTotal:       263686408 kB\r\nMemFree:        150322584 kB\r\nMemAvailable:   221228188 kB\r\n...\r\n\r\nFails with both Intel and AMD servers.\r\n\r\n\r\n\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-102750\n* gh-102777\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/kumbera1","@type":"Person","name":"kumbera1"},"datePublished":"2023-03-14T21:33:43.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/102701/cpython/issues/102701"}