mirror of https://github.com/Qiskit/qiskit.git
20 lines
1.2 KiB
YAML
20 lines
1.2 KiB
YAML
---
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upgrade:
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The minimum supported version of ``symengine`` is now 0.9.0. This was
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necessary to improve compatibility with Python's ``pickle`` module which
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is used internally as part of parallel dispatch with :func:`.parallel_map`.
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The default value of ``QISKIT_PARALLEL`` when running with Python 3.9 on
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Linux is now set to ``TRUE``. This means when running :func:`.parallel_map`
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or functions that call it internally, such as :func:`.transpile` and
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:func:`.assemble`, the function will be executed in multiple processes and
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should have better run time performance. This change was made because the
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issues with reliability of parallel dispatch appear to have been resolved
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(see `#6188 <https://github.com/Qiskit/qiskit-terra/issues/6188>`__ for
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more details). If you still encounter issues because of this you can disable
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multiprocessing and revert to the previous default behavior by setting the
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``QISKIT_PARALLEL`` environment variable to ``FALSE``, or setting the
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``parallel`` option to ``False`` in your user config file (also please file
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an issue so we can track any issues related to multiprocessing).
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