time mandelbrot -out=out.png -h=4096 -w=4096 -mode=seq
  real	0m25.858s
  user	0m25.260s
  sys	0m0.219s
  
  time mandelbrot -out=out.png -h=4096 -w=4096 -mode=px
  real	0m11.575s
  user	0m27.576s
  sys	0m0.186s
  
  time mandelbrot -out=out.png -h=4096 -w=4096 -mode=row
  real	0m11.854s
  user	0m27.890s
  sys	0m0.188s
  
  time mandelbrot -out=out.png -h=4096 -w=4096 -mode=workers -workers=1
  real	0m36.673s
  user	0m42.374s
  sys	0m21.116s
  
  time mandelbrot -out=out.png -h=4096 -w=4096 -mode=workers -workers=2
  real	0m23.045s
  user	0m37.755s
  sys	0m9.540s
  
  time mandelbrot -out=out.png -h=4096 -w=4096 -mode=workers -workers=4
  real	0m16.897s
  user	0m39.619s
  sys	0m4.055s
  
  time mandelbrot -out=out.png -h=4096 -w=4096 -mode=workers -workers=8
  real	0m17.390s
  user	0m41.210s
  sys	0m3.086s
  
  time mandelbrot -out=out.png -h=4096 -w=4096 -mode=workers -workers=16
  real	0m16.923s
  user	0m40.004s
  sys	0m2.418s
  
  time mandelbrot -out=out.png -h=4096 -w=4096 -mode=workers -workers=32
  real	0m16.603s
  user	0m40.724s
  sys	0m2.727s
  
  time mandelbrot -out=out.png -h=4096 -w=4096 -mode=workers -workers=64
  real	0m16.379s
  user	0m40.183s
  sys	0m2.468s
  
  time mandelbrot -out=out.png -h=4096 -w=4096 -mode=workers -workers=128
  real	0m16.006s
  user	0m39.889s
  sys	0m2.148s
  
  time mandelbrot -out=out.png -h=4096 -w=4096 -mode=workers -workers=256
  real	0m16.055s
  user	0m39.902s
  sys	0m2.155s
  
  time mandelbrot -out=out.png -h=4096 -w=4096 -mode=workers -workers=512
  real	0m16.028s
  user	0m39.938s
  sys	0m2.354s
  
  time mandelbrot -out=out.png -h=4096 -w=4096 -mode=workers -workers=1024
  real	0m16.246s
  user	0m39.893s
  sys	0m3.084s
  
  time mandelbrot -out=out.png -h=4096 -w=4096 -mode=workers -workers=2048
  real	0m16.263s
  user	0m40.196s
  sys	0m3.253s