On 25.04.2012 15:10, aylwyn wrote:
Hi, I've just written a smallish program reading
lines from stdin and doing some parsing and other text
processing. I find it's about 3-4 times faster than a python
script I had doing the same thing, which is nice but not as good
as I hoped. After profiling, it seems almost half the total time
is being spent in
std.stdio.File.ByLine!(char, char).ByLine.popFront()
called once per line on stdin, and within that mostly in
std.stdio.File.readln!(char).readln(ref char[], dchar)
Before I do some benchmark comparisons with C etc, can I just
check that
foreach (line; stdin.byLine())
is the correct way to do this. Are there any lower-level methods
I could use for buffered access to a stream of chars?
It is. It needs more optimizations though. There have been talks of
byLineAsync() that will opportunistically fill next line in background
and so on and so forth.
(using DMD64 D Compiler v2.058.)
I bet straight fgets will beat stdin.byLine.
--
Dmitry Olshansky
