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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`PyType_GetModuleByDef` is really slow.","articleBody":"`PyType_GetModuleByDef` does a lot of work for what was a single memory read prior to sub-interpreters.\r\n\r\nFor example, https://github.com/python/cpython/issues/114682.\r\n\r\nWe should provide a more efficient way to get to the module state from the module def.\r\n\r\nAFAICT, the function to get the module state is a pure function of the interpreter and the module def.\r\nSince the module def already has a `m_index` field that is described as \"The module's index into its interpreter's modules_by_index cache.\", then a `Py_GetModuleFromDef()` function could be as simple as:\r\n\r\n```C\r\ninline PyObject *\r\nPy_GetModuleFromDef(PyModuleDef *def)\r\n{\r\n     return PyInterpreterState_Get()-\u003emodules_table[def-\u003em_base.m_index];\r\n}\r\n```\r\n","author":{"url":"https://github.com/markshannon","@type":"Person","name":"markshannon"},"datePublished":"2024-05-28T15:23:05.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":10},"url":"https://github.com/119663/cpython/issues/119663"}