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[wasm-split] Slow splitting many modules #7722
Description
For a large file, wasm-split with --multi-split takes 3.5+ minutes to separate the file into ~350 submodules.
My understanding is that --multi-split basically invokes split mode iteratively. I imagine it would be faster if it processed the entire main module at once [O(n)] rather than walking the entire (albeit slowly shrinking) main module many times [O(n^2)].
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tlively commentedon Jul 15, 2025
cc @aheejin
aheejin commentedon Dec 12, 2025
#7956 reduced the splitting time of a Dart test case that splits a module into 350 submodules by around 66%.
aheejin commentedon Jan 28, 2026
Running time improvements:
After #7956: ~80s
After #8221: ~16s
aheejin commentedon Mar 5, 2026
I think we can close this at this point probably.