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The report would use the compressed size as total and the uncompressed for progress, which rather obviously does not work. The only efficient way is to count compressed bytes, which is good enough really
… buffer is empty If the zstd lib does not have enough data for a full block, it returns an empty buffer. Bypass the underlying IO's write call in that case.
Was 1M, which turns out to be rather expensive if the samples are small. 128k seems to be a good tradeoff
wvmcastro
approved these changes
Feb 27, 2026
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