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Lookup functions have fields parameter to speed up decoding#7

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marselester merged 1 commit into
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lookup-fields
Feb 22, 2026
Merged

Lookup functions have fields parameter to speed up decoding#7
marselester merged 1 commit into
mainfrom
lookup-fields

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@marselester marselester commented Feb 22, 2026 •
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The fields parameter controls which fields to decode (the remaining ones will be empty). If we limit decoding to city field, we can get ~83% faster lookups on 1M sample (tested on M2 Pro):

  • all fields ~441K lookups/sec median
  • only city ~808K lookups/sec median
$ for i in $(seq 1 10); do
    zig build benchmark_lookup -- GeoLite2-City.mmdb 1000000 \
      2>&1 | grep 'Lookups Per Second'
  done

  echo '---'

  for i in $(seq 1 10); do
    zig build benchmark_lookup -- GeoLite2-City.mmdb 1000000 city \
      2>&1 | grep 'Lookups Per Second'
  done

Lookups Per Second: 435031
Lookups Per Second: 448831
Lookups Per Second: 424320
Lookups Per Second: 450519
Lookups Per Second: 453749
Lookups Per Second: 432921
Lookups Per Second: 456187
Lookups Per Second: 428405
Lookups Per Second: 450528
Lookups Per Second: 424362
---
Lookups Per Second: 762510
Lookups Per Second: 810526
Lookups Per Second: 796118
Lookups Per Second: 819167
Lookups Per Second: 768519
Lookups Per Second: 812188
Lookups Per Second: 807066
Lookups Per Second: 729973
Lookups Per Second: 824185
Lookups Per Second: 809390

@marselester
marselester merged commit ef0b0c7 into main Feb 22, 2026
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