v/cmd/tools/bench/wyhash.v

module main

import hash.fnv1a
import hash as wyhash
import rand
import benchmark

fn main() {
	rand.seed([u32(42), 0])
	sample_size := 10000000
	min_str_len := 20
	max_str_len := 40
	println('Generating ${sample_size} strings between ${min_str_len} - ${max_str_len} chars long...')
	mut checksum := u64(0)
	mut start_pos := 0
	mut bgenerating := benchmark.start()
	mut bytepile := []u8{}
	for _ in 0 .. sample_size * max_str_len {
		bytepile << u8(rand.int_in_range(40, 125) or { 40 })
	}
	mut str_lens := []int{}
	for _ in 0 .. sample_size {
		str_lens << rand.int_in_range(min_str_len, max_str_len) or { min_str_len }
	}
	bgenerating.measure('generating strings')
	println('Hashing each of the generated strings...')
	//
	mut bhashing_1 := benchmark.start()
	start_pos = 0
	checksum = 0
	for len in str_lens {
		end_pos := start_pos + len
		checksum ^= wyhash.wyhash_c(unsafe { &u8(bytepile.data) + start_pos }, u64(len),
			1)
		start_pos = end_pos
	}
	bhashing_1.measure('wyhash.wyhash_c  | checksum: ${checksum:22}')
	mut bhashing_2 := benchmark.start()
	start_pos = 0
	checksum = 0
	for len in str_lens {
		end_pos := start_pos + len
		checksum ^= wyhash.sum64(bytepile[start_pos..end_pos], 1)
		start_pos = end_pos
	}
	bhashing_2.measure('wyhash.sum64     | checksum: ${checksum:22}')
	mut bhashing_3 := benchmark.start()
	start_pos = 0
	checksum = 0
	for len in str_lens {
		end_pos := start_pos + len
		checksum ^= fnv1a.sum64(bytepile[start_pos..end_pos])
		start_pos = end_pos
	}
	bhashing_3.measure('fnv1a.sum64      | checksum: ${checksum:22}')
}