https://d.puremagic.com/issues/show_bug.cgi?id=11810
Summary: std.stdio.byLine/readln performance is very bad
Product: D
Version: D2
Platform: All
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P2
Component: Phobos
AssignedTo: [email protected]
ReportedBy: [email protected]
--- Comment #0 from Peter Alexander <[email protected]> 2013-12-24
04:34:29 PST ---
std.stdio.readln (and hence byLine) use repeated calls to fgetc() to find the
new line characters. This is a very inefficient way to read files (lots of
per-byte overhead).
I have a version of byLine that reads the files in 4kb chunks and then does the
new line search. It is 6 times faster than byLine on my machine on a 10MB file
(OSX 10.8.5, x64 2GHz MacBook).
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