Performance

Performance

Performance has been tested on MacBook Pro 2017, using Rust 1.36 and tinystr 0.1.0.

FromStr

• 4 char max:
  • String: 1.0779 us
  • TinyStr4: 25.999 ns
  • TinyStr8: 104.81 ns
• 8 char max:
  • String: 1.0864 us
  • TinyStr8: 107.37 ns

to_ascii_lowercase

• 4 char max:
  • String: 1.1313 us
  • TinyStr4: 20.164 ns
  • TinyStr8: 28.205 ns
• 8 char max:
  • String: 1.1442 us
  • TinyStr8: 28.211 ns

to_ascii_uppercase

• 4 char max:
  • String: 1.1282 us
  • TinyStr4: 20.982 ns
  • TinyStr8: 24.347 ns
• 8 char max:
  • String: 1.1420 us
  • TinyStr8: 24.327 ns

to_ascii_titlecase

• 4 char max:
  • String: 1.1487 us
  • TinyStr4: 24.566 ns

is_ascii_alphanumeric

• 4 char max:
  • String: 35.767 ns
  • TinyStr4: 21.027 ns
  • TinyStr8: 32.094 ns
• 8 char max:
  • String: 45.881 ns
  • TinyStr8: 32.094 ns

Performance vs. other small string libraries

• istring 0.1.13
• smol_str 0.1.12
• smallstr 0.1.0
• arraystring 0.4.11

FromStr

• 4 char max:
  • SmolStr: 182.33 ns
  • smallstr: 12.833 ns
  • ArrayString: 92.262 ns
  • istring: 155.55 ns
  • String: 1.0956 us
  • TinyStr4: 25.774 ns
  • TinyStr8: 101.39 ns
• 8 char max:
  • SmolStr: 184.60 ns
  • smallstr: 12.651 ns
  • ArrayString: 123.95 ns
  • istring: 156.42 ns
  • String: 1.0929 us
  • TinyStr8: 104.22 ns

PartialEq

• 4 char max:
  • SmolStr: 1.0656 us
  • smallstr: 723.41 ns
  • ArrayString: 595.96 ns
  • istring: 717.85 ns
  • String: 643.44 us
  • TinyStr4: 90.233 ns
  • TinyStr8: 90.142 ns
• 8 char max:
  • SmolStr: 627.72 ns
  • ArrayString: 449.90 ns
  • smallstr: 614.21 ns
  • istring: 396.65 ns
  • String: 421.27 us
  • TinyStr8: 90.664 ns

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