🚀 go-pugleaf

On Sun, 18 Apr 2004 00:36:41 +0200
Aaron Isotton <aaron@isotton.com> wrote:

> I am writing an application reading big text files (hundreds of 
> megabytes) line by line. I was reading the files using std::getline and 
> I noticed that it is *incredibly* slow. So I wrote three test programs, 
> one using fgets(), one using std::getline() and one using 
> std::ifstream::getline(). I have read the same file (200000 lines, 39MB)
> 

Results with Sun's C/C++ Forte 6.2 compilers on a dual processor
Ultra60/360 with Solaris8 (options -fast -O):

ultra~/Stuff/iotest[195] time ./stdio
0.71u 0.14s 0:01.00 85.0%
ultra~/Stuff/iotest[196] time ./streams
5.49u 0.23s 0:06.10 93.7%
ultra~/Stuff/iotest[197] time ./streams2
3.85u 0.18s 0:04.17 96.6%

With gcc 2.95.2:
ultra~/Stuff/iotest[203] time ./stdio
0.72u 0.18s 0:00.93 96.7%
ultra~/Stuff/iotest[204] time ./streams
16.96u 0.16s 0:18.33 93.3%
ultra~/Stuff/iotest[205] time ./streams2
0.74u 0.16s 0:00.97 92.7%

The slow execution of "streams" seems to be a gcc bug.
Interestingly, the streams2 program is much faster when
compiled with gcc. 

Take care,


-- 
Stefaan
-- 
"What is stated clearly conceives easily."  -- Inspired sales droid