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We will want to query `keep_cache` from parallel threads. If we compute the results on-demand, that means we need synchronization for cache access in those queries, which adds complexity and overhead. Instead, prefill the cache with the status of all relevant modules. Note that this doesn't actually do more work --- we always consult `keep_cache` for all cells of all selected modules, so scanning all those cells and determining the kept status of all dependency modules is always required. Later in this PR we're going to parallelize `scan_module` itself, and that's also much easier to do when no other parallel threads are running. |
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