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Performance

Zibi Braniecki edited this page Oct 28, 2019 · 12 revisions

Performance

Performance has been tested on MacBook Pro 2017, using Rust 1.38 and tinystr 0.3.2.

All benchmarks use black_box wrapper.

FromStr
Char Limit String TinyStr4 TinyStr8 TinyStr16
4 1.078 us 31.51 ns 98.67 ns 115.47 ns
8 1.009 us 101.77 ns 119.43 ns
16 1.081 us 122.64 ns
to_ascii_lowercase
Char Limit String TinyStr4 TinyStr8 TinyStr16
4 1.088 us 20.70 ns 26.93 ns 32.07 ns
8 1.105 us 27.00 ns 31.60 ns
16 1.238 us 31.72 ns
to_ascii_uppercase
Char Limit String TinyStr4 TinyStr8 TinyStr16
4 1.087 us 20.79 ns 27.36 ns 33.85 ns
8 1.097 us 27.14 ns 33.22 ns
16 1.109 us 33.19 ns
to_ascii_titlecase
Char Limit String TinyStr4 TinyStr8 TinyStr16
4 1.139 us 23.80 ns 26.90 ns 42.27 ns
8 1.165 us 27.01 ns 42.39 ns
16 1.173 us 42.15 ns
is_ascii_alphanumeric
Char Limit String TinyStr4 TinyStr8 TinyStr16
4 42.10 ns 21.45 ns 30.64 ns 34.90 ns
8 52.19 ns 30.66 ns 35.05 ns
16 78.00 us 34.95 ns
PartialEq
Char Limit String TinyStr4 TinyStr8 TinyStr16
4 659.48 ns 85.80 ns 86.07 ns 141.57 ns
8 433.12 ns 90.79 ns 146.25 ns
16 380.83 us 147.61 ns

Performance vs. other small string libraries

Crate Version Notes
istring 0.1.13 IString::from and Rust Nightly has been used
smol_str 0.1.15 SmolStr::from has been used
smallstr 0.1.0 FromStr with <[u8; 4/8/16]> has been used
arraystring 0.3.0 FromStr with U4/U8/U16 has been used
FromStr
Char Limit SmolStr smallstr ArrayString istring String TinyStr4 TinyStr8 TinyStr16
4 318.70 ns 184.02 ns 109.26 ns 130.07 ns 1.078 us 31.51 ns 98.67 ns 115.47 ns
8 309.23 ns 185.24 ns 133.08 ns 131.42 ns 1.009 us 101.77 ns 119.43 ns
16 307.28 ns 248.08 ns 172.67 ns 132.88 ns 1.081 us 122.64 ns
PartialEq
Char Limit SmolStr smallstr ArrayString istring String TinyStr4 TinyStr8 TinyStr16
4 1.584 us 1.053 us 743.74 ns 1.169 us 659.48 ns 85.80 ns 86.07 ns 141.57 ns
8 1.343 us 706.87 ns 498.56 ns 870.97 ns 433.12 ns 90.79 ns 146.25 ns
16 1.190 us 727.96 ns 467.14 ns 724.64 ns 380.83 ns 147.61 ns

For other operations, SmolStr, ArrayString, smallstr and istring have performance comparable to String.