Python JIT Compiler Project Faces Suspension Over Process Issues

The Python steering council has announced a suspension of new development on the JIT compiler project, citing improper process adherence. A new Python Enhancement Proposal (PEP) must be created and accepted within six months, or the existing JIT code will be removed from the main branch. This decision is unexpected, as the JIT compiler is a key feature of the upcoming Python 3.15 release, promising an 8-9% performance improvement over the standard interpreter. The council's statement indicates that the JIT code should not have been merged due to unresolved questions regarding maintenance, compatibility, and success metrics. Key contributor Mark Shannon expressed concerns that halting development could lead to a loss of momentum and new contributors. The steering council's intent is not to invite competing proposals but to ensure a robust infrastructure for JIT implementations. The future of the JIT project is now uncertain, with a tight six-month deadline for a new PEP.

Key Points: • New development on the Python JIT compiler is suspended pending a new PEP. • Existing JIT code will be removed in six months if no PEP is approved. • The JIT compiler is a key feature of the upcoming Python 3.15 release.