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mpi-mandelbrot

Dynamic MPI mandelbrot algorithm

Usage

usage: ./mandelbrot [options]

OPTIONS:
    -h                   Shows this help.
    -c {width}           Width of resulting image. Has to be positive integer.
                         (default: 1024)
    -r {height}          Height of resulting image. Has to be positive integer.
                         (default: 1024)
    -n {iterations}      Maximum number of iterations for each pixel. Has to be
                         positive integer (default: 2000)
    -o {filename}        Filename of resulting bitmap. (default: ./mandelbrot.bmp)
    -b {blocksize}       Number of rows to be assigned to a slave at once.
                         Has to be smaller than (height/slave-count).
                         Has to be a divisor of height. (default: 1)
    -x {offset}          X-offset from [0,0]. (default: 0)
    -y {offset}          Y-offset from [0,0]. (default: 0)
    -a {length}          Absolute value range of x/y-axis, e.g. if length was 2, 
                         displayed x/y-values would range from -1 to 1. 
                         If the x/y-offsets are set, axis shifts by those offsets.
                         Negative value inverts axis.
                         Has to be non-zero double value. (default: 2)
    -p {hexnum}          Minimum color of the resulting image. (default: 0x000000)
    -q {hexnum}          Maximum color of the resulting image. (default: 0xffffff)
    -m {hexnum}          Hex mask to manipulate color ranges. (default: 0xffffff)
    -z {steps}           Number of zoom steps to take. (default: 1)
    -f {zoomfactor}      Zoom factor. Axis is reduced by this factor for each step. 
                         (default: 0.75)
    -s                   Print progress of the computation.

Usage examples

Zoomed out

mpirun -np 4 ./mandelbrot -n 20000 -a 3.5

Inverted axis and blocksize 8

mpirun -np 4 ./mandelbrot -n 5000 -b 8 -a -2

Shift and zoom

mpirun -np 4 ./mandelbrot -n 10000 -x -1 -y -1 -a 1

Inverted colors and custom output file

mpirun -np 4 ./mandelbrot -n 10000 -p 0xffffff -q 0x000000 -o ./output.bmp

Inverted color with color mask

mpirun -np 4 ./mandelbrot -n 10000 -p 0xffffff -q 0x000000 -m 0x00bb00

Shifted, zoomed in, increased iteration count and custom min-color value

mpirun -np 4 ./mandelbrot -n 30000 -x -1 -y -1 -a 1 -p 0x0099ff

The "head" of the mandelbrot "thing": Custom min-color value and filtered blue part

mpirun -np 4 ./mandelbrot -n 5000 -a 0.5 -x -1 -p 0xbb9955 -m 0xffff00

Show progress bar on master

mpirun -np 4 ./mandelbrot -n 100000 -s