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Small Strings in Rust: smolstr vs. smartstring (2020)
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We can also see that between those peaks, memory usage increases steadily - each String stores its data on the heap, which explains the number of allocation events, 2017. And our initial streaming solution may well work - because we're only reading out the city and state fields - not all the others, which I'm sure make up the bulk of the 100 GiB input file. As for smartstring, it's recommended for "a key type for a B-tree" (such as BTreeMap), because inline strings greatly improve cache locality.
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