Qiskit
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web-flowFix unnecessary serialisation of `PassManager` in serial contexts (backport #12410) (#12500) * Fix unnecessary serialisation of `PassManager` in serial contexts (#12410) * Fix unnecessary serialisation of `PassManager` in serial contexts This exposes the interal decision in `parallel_map` of whether to actually run in serial or not. If not, there's no need for `PassManager` to side-car its `dill` serialisation onto the side of the IPC (we use `dill` because we need to pickle lambdas), which can be an unfortunately huge cost for certain IBM pulse-enabled backends. * Remove new function from public API This makes the patch series safe for backport to 1.1. (cherry picked from commit b12e9ec3c) # Conflicts: # qiskit/utils/__init__.py # qiskit/utils/parallel.py * solve conflicts * passmanager does not know the cpu_count --------- Co-authored-by: Jake Lishman <jake.lishman@ibm.com> Co-authored-by: Luciano Bello <bel@zurich.ibm.com>
74979 of 86276 relevant lines covered (86.91%)
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