Re: [Tarantool-patches] [PATCH v2 luajit 14/41] perf: adjust mandelbrot in LuaJIT-benches

[Sergey Bronnikov via Tarantool-patches <tarantool-patches@dev.tarantool.org>]

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Hi, Sergey!

thanks for the patch! LGTM

Sergey

On 12/26/25 12:17, Sergey Kaplun wrote:
> This patch adjusts the aforementioned test to use the benchmark
> framework introduced before. The default arguments are adjusted
> according to the <PARAM_x86.txt> file. The arguments to the script still
> can be provided in the command line run.
>
> The output is redirected to /dev/null. The check is skipped since it is
> very inconvenient to check the binary output, especially since it may be
> configured by the parameter.
> ---
>   perf/LuaJIT-benches/mandelbrot.lua | 70 ++++++++++++++++++++++--------
>   1 file changed, 51 insertions(+), 19 deletions(-)
>
> diff --git a/perf/LuaJIT-benches/mandelbrot.lua b/perf/LuaJIT-benches/mandelbrot.lua
> index 0ef595a2..999ff200 100644
> --- a/perf/LuaJIT-benches/mandelbrot.lua
> +++ b/perf/LuaJIT-benches/mandelbrot.lua
> @@ -1,23 +1,55 @@
> +-- The benchmark to check the performance of multiple inner loops
> +-- with arithmetic operations. Calculates the Mandelbrot Set on a
> +-- bitmap and dumps output in the portable bitmap format.
> +-- For the details see:
> +--https://benchmarksgame-team.pages.debian.net/benchmarksgame/description/mandelbrot.html
>   
> -local write, char, unpack = io.write, string.char, unpack
> -local N = tonumber(arg and arg[1]) or 100
> -local M, ba, bb, buf = 2/N, 2^(N%8+1)-1, 2^(8-N%8), {}
> -write("P4\n", N, " ", N, "\n")
> -for y=0,N-1 do
> -  local Ci, b, p = y*M-1, 1, 0
> -  for x=0,N-1 do
> -    local Cr = x*M-1.5
> -    local Zr, Zi, Zrq, Ziq = Cr, Ci, Cr*Cr, Ci*Ci
> -    b = b + b
> -    for i=1,49 do
> -      Zi = Zr*Zi*2 + Ci
> -      Zr = Zrq-Ziq + Cr
> -      Ziq = Zi*Zi
> -      Zrq = Zr*Zr
> -      if Zrq+Ziq > 4.0 then b = b + 1; break; end
> +local bench = require("bench").new(arg)
> +
> +local N = tonumber(arg and arg[1]) or 5000
> +
> +local function payload()
> +  -- These functions must not be an upvalue but the stack slot.
> +  local N = N
> +  local write, char, unpack = io.write, string.char, unpack
> +  local M, ba, bb, buf = 2 / N, 2 ^ (N % 8 + 1) - 1, 2 ^ (8 - N % 8), {}
> +  write("P4\n", N, " ", N, "\n")
> +  for y = 0, N - 1 do
> +    local Ci, b, p = y * M - 1, 1, 0
> +    for x = 0, N - 1 do
> +      local Cr = x * M - 1.5
> +      local Zr, Zi, Zrq, Ziq = Cr, Ci, Cr * Cr, Ci * Ci
> +      b = b + b
> +      for i = 1, 49 do
> +        Zi = Zr * Zi * 2 + Ci
> +        Zr = Zrq - Ziq + Cr
> +        Ziq = Zi * Zi
> +        Zrq = Zr * Zr
> +        if Zrq + Ziq > 4.0 then b = b + 1; break; end
> +      end
> +      if b >= 256 then p = p + 1; buf[p] = 511 - b; b = 1; end
>       end
> -    if b >= 256 then p = p + 1; buf[p] = 511 - b; b = 1; end
> +    if b ~= 1 then p = p + 1; buf[p] = (ba - b) * bb; end
> +    write(char(unpack(buf, 1, p)))
>     end
> -  if b ~= 1 then p = p + 1; buf[p] = (ba-b)*bb; end
> -  write(char(unpack(buf, 1, p)))
>   end
> +
> +local stdout = io.output()
> +
> +bench:add({
> +  name = "mandelbrot",
> +  items = N,
> +  -- XXX: This is inconvenient to have the binary file in the
> +  -- repository for the comparison. If the check is needed run,
> +  -- the payload manually.
> +  skip_check = true,
> +  setup = function()
> +    io.output("/dev/null")
> +  end,
> +  teardown = function()
> +    io.output(stdout)
> +  end,
> +  payload = payload,
> +})
> +
> +bench:run_and_report()

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