howto count lines - fast

[Nitram via Digitalmars-d-learn]

I am glad to see this participation on this issue :)
The hints about trying another compiler and std.mmfile turned out 
to be very effective.

Even this simple code is faster then my systems "wc -l" now:
>void main() {
>	import std.stdio;
>	writeln(lcs("benchmark.dat"));
>}
>
>size_t lcs(string filename) {
>	import std.mmfile;
>	auto f = new MmFile(filename);
>	auto data = cast(ubyte[]) f[];
>	size_t c = 0;
>	foreach(ref i ; data) {
>		if (i == '\n') c++;
>	}
>	return c;
>}

>time wc -l ./benchmark.dat
>10500000 ./benchmark.dat
>wc -l ./benchmark.dat  0,06s user 0,03s system 99% cpu 0,089 
>total

>time ./lcs
>10500000
>./lcs  0,05s user 0,01s system 99% cpu 0,061 total