On Monday, 1 January 2018 at 15:09:53 UTC, Lily wrote:
I started learning D a few days ago, coming from some very
basic C++ knowledge, and I'd like some help getting a program
to run faster. The code is here:
https://github.com/IndigoLily/D-mandelbrot/blob/master/mandelbrot.d
Right now it runs slower than my JavaScript Mandelbrot renderer
on the same quality settings, which is clearly ridiculous, but
I don't know what to do to fix it. Sorry for the lack of
comments, but I can never tell what will and won't be obvious
to other people.
- The first thing is to compile with the best options:
dmd mandelbrot.d -O -release -inline -boundscheck=off
- You append a lot, which can cause reallocs for imageData; Try
import std.array;
Appender!(ubyte[]) imageData;
The code will not have to be changed for "~=" since Appender
overloads this operator.
- I'd use "double" instead of "real".
