speedy-stdio 0.1.0

speedy-stdio

A faster replacement for a subset of std.stdio functionality from the standard D language library. Tested on Linux/Windows. Only implements write and writeln functions in the initial release. Does not need GC for printing integers, strings and nested arrays of integers.

The following 99 bottles of beer example can be used as a benchmark (be sure to redirect its output to a file or to /dev/null):

/+dub.sdl:
dependency "speedy-stdio" version="~>0.1"
+/
@safe: @nogc:
import speedy.stdio;

void print_lyrics() {
  auto bottles(int n) { return n == 1 ? " bottle" : " bottles"; }
  foreach_reverse(n ; 1 .. 100) {
    write(n, bottles(n), " of beer on the wall, ");
    writeln(n, bottles(n), " of beer.");
    write("Take one down and pass it around, ");
    if (n - 1 <= 0)
      write("no more bottles");
    else
      write(n - 1, bottles(n - 1));
    writeln(" of beer on the wall.");
    writeln;
  }
  writeln("No more bottles of beer on the wall, no more bottles of beer.");
  writeln("Go to the store and buy some more, 99 bottles of beer on the wall.");
}

void main() {
  foreach (i ; 0 .. 100000) {
    print_lyrics;
    writeln;
  }
}

Compiled with LDC 1.30.0 on Core i7-860 @2.8GHz:

$ time ./speedy-stdio-bottles > /dev/null

real	0m1.242s
user	0m1.242s
sys	0m0.000s

$ time ./std-stdio-bottles > /dev/null

real	0m6.879s
user	0m6.762s
sys	0m0.100s