Niels Lohmann
2bc2f7d09d
- Size the buffer of decoded strings on its first growth from the input (a quarter of it plus 16 bytes, at most 4 KiB) instead of 272 bytes, so that a document with escapes does not grow it twice, with a zero-filled copy each time. - Allocate the node index of documents with an estimate of up to 1024 nodes (was 256) together with the header, which saves one allocation. When the estimate is too low (dense numbers), that block stays unused: at most 16 KiB instead of 4 KiB. shrink_to_fit() cannot release it separately; the documentation says so. Fresh parse of a 2.5 KB minified tweet: 993 to 958 ns (-3.5 %), traverse and select -3 %, with no row consistently slower (Apple M1 Max, 30 rounds, three runs). Dense numeric documents parse about 9 % faster and keep up to 16 KiB more memory. Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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