mandelbrot
An example on how to use different concurrency patterns with Go to compute Mandelbrot sets.
It turns out the simplest way is also the fastest! Just run one goroutine per pixel and you get more than 50% speed-up
Some stats:
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