ZipReadBinaryProvider: Decompress largest zip archives first#1715
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BillyONeal merged 1 commit intomicrosoft:mainfrom Jun 30, 2025
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This results in lower total time needed to decompress all zip files.
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... what? Do we know why that order is faster? |
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If you have 2 cores and the Tasks You are using 7 time slots. If you start with the largest: you only need 5 time slots. |
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I see, because we are parallelizing it's the bin packing problem and we're using size as a proxy for how big each task is in the bin. |
BillyONeal
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Jun 30, 2025
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Thanks for the improvement!
BillyONeal
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Oct 8, 2025
| m_fs.file_size(zip_paths[i].get()->path, VCPKG_LINE_INFO)); | ||
| action_idxs.push_back(i); | ||
| } | ||
| std::sort(jobs_with_size.begin(), jobs_with_size.end(), [](const auto& l, const auto& r) { |
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I just realized this is completely broken because it broke the invariant that action_idxs[N] is talking about jobs[N] for all N, so we are now recording which packages got restored completely incorrectly :(
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Hm then we have to also Save the original Index for every job
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This results in lower total time needed to decompress all zip files.
For example from 4.4 min to 3.8 min @ daily job