jungfrau and Claude Opus 5 4b48d19064
Keep the threads the parallel passes run on, rather than making them per pass ...
ParallelChunks and ParallelFor started a thread per chunk with std::async and joined it
again on every call. A thread costs tens of microseconds to create and join, and the
analysis code repeats some of these passes thousands of times in a run - the merge alone
has dozens of call sites, several of them inside iteration loops - so a short pass could
spend more on its threads than on the work.
Both now run on a pool made once and kept. The split is unchanged, so a pass whose
per-element work is independent still gives the serial answer bit for bit.
Two properties the futures gave for free had to be kept explicitly. A pass reached from
inside a pool worker runs inline instead of queueing, since the workers are occupied by
the outer pass and waiting for one of them could wait forever. And an exception from any
task is held until every task has finished and then rethrown to the caller, so the others
still run to completion.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com >
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