test_maxmind.js

const mmap = require('mmap-io')
const { noop } = require('lodash')
const fs = require('fs')
const maxmind = require('maxmind')

const fake_cache = {
    get: noop,
    set: noop
}

const loader = (path, use_mmap) => {
    if (use_mmap) {
        const { size } = fs.statSync(path)
        const fd = fs.openSync(path, 'r')
        const flags = mmap.MAP_SHARED | mmap.MAP_POPULATE

        const buffer = mmap.map(
            size,
            mmap.PROT_READ,
            flags,
            fd,
            0,
            mmap.MADV_WILLNEED
        )
        fs.closeSync(fd)
        return buffer
    } else {
        const buffer = fs.readFileSync(fullPath)
        return buffer
    }
}

mmap_file = new maxmind.Reader(loader('./files/registry.mmdb', true))
no_mmap_file = new maxmind.Reader(loader('./files/registry.mmdb', true))

const do_test = (lib) => {
    console.time('Test');
    for (let i = 0; i < 100000; i++) {
        lib.get('8.8.8.8')
        lib.get('8.8.4.4')
        lib.get('1.1.1.1')
    }
    console.timeEnd('Test');
}

console.log("MMAP file with cache")
do_test(mmap_file)
console.log("Non-MMAP file with cache")
do_test(no_mmap_file)

mmap_file.decoder.cache = fake_cache
no_mmap_file.decoder.cache = fake_cache

console.log("MMAP file NO cache")
do_test(mmap_file)
console.log("Non-MMAP file NO cache")
do_test(no_mmap_file)