Minetest random benchmark

bench_mt_rand.lua

collectgarbage"stop" -- we don't want GC heuristics to interfere

local n = 1e8 -- number of runs
local function bench(name, constructor, invokation)
	local func = assert(loadstring(([[
local r = %s
for _ = 1, %d do %s end
]]):format(constructor, n, invokation)))
	local t = minetest.get_us_time()
	func()
	print(name, (minetest.get_us_time() - t) / n, "µs/call")
end

bench("Lua", "nil", "math.random()")
bench("PCG", "PcgRandom(42)", "r:next()")
bench("K&R", "PseudoRandom(42)", "r:next()")
bench("Secure", "assert(SecureRandom())", "r:next_bytes()")