spectral-norm Lua program | Computer Language Benchmarks Game

performance measurements

Each table row shows performance measurements for this Lua program with a particular command-line input value N.

N	CPU secs	Elapsed secs	Memory KB	Code B	≈ CPU Load
500	2.00	2.00	824	329	0% 0% 1% 100%
3,000	72.64	72.66	824	329	0% 0% 0% 100%
5,500	243.58	243.64	940	329	0% 0% 0% 100%

Read the ↓ make, command line, and program output logs to see how this program was run.

Read spectral-norm benchmark to see what this program should do.

notes

spectral-norm Lua program source code

-- The Computer Language Benchmarks Game
-- http://benchmarksgame.alioth.debian.org/
-- contributed by Mike Pall

local function A(i, j)
  local ij = i+j-1
  return 1.0 / (ij * (ij-1) * 0.5 + i)
end

local function Av(x, y, N)
  for i=1,N do
    local a = 0
    for j=1,N do a = a + x[j] * A(i, j) end
    y[i] = a
  end
end

local function Atv(x, y, N)
  for i=1,N do
    local a = 0
    for j=1,N do a = a + x[j] * A(j, i) end
    y[i] = a
  end
end

local function AtAv(x, y, t, N)
  Av(x, t, N)
  Atv(t, y, N)
end

local N = tonumber(arg and arg[1]) or 100
local u, v, t = {}, {}, {}
for i=1,N do u[i] = 1 end

for i=1,10 do AtAv(u, v, t, N) AtAv(v, u, t, N) end

local vBv, vv = 0, 0
for i=1,N do
  local ui, vi = u[i], v[i]
  vBv = vBv + ui*vi
  vv = vv + vi*vi
end
io.write(string.format("%0.9f\n", math.sqrt(vBv / vv)))

make, command-line, and program output logs

Wed, 30 Jan 2013 04:29:34 GMT

COMMAND LINE:
/usr/local/src/lua-5.2.1/install/bin/lua  spectralnorm.lua 5500

PROGRAM OUTPUT:
1.274224153

Home Conclusions License Play

Ubuntu : Intel® Q6600® one coreComputer Language Benchmarks Game [[ Play ]]

performance measurements

notes

spectral-norm Lua program source code

make, command-line, and program output logs

Ubuntu : Intel® Q6600® one core
Computer Language Benchmarks Game [[ Play ]]