Serious performance problems

[Colin Fox]

Greetings.

I've installed (in test directories) gcc3.0 and the 3.0 stdc++ library.
Just out of curiosity, I did a performance test against the old compiler
I was using (2.96).

My quick tests seem to indicate a 30x slowdown in the new iostreams.

This program:
-----------------------

#include <iostream>

using namespace std;

int main(int argc, char *argv[])
    {
    cin >> cout.rdbuf();
    }

-----------------------

Runs with these times on my celeron 500 (the bigtest.txt file is about a
megabyte long). the t4_30 program is the gcc3.0 compiled version. t4 is
the gcc 2.96 version.


[cfox@elgrande perf]$ time ./t4_30 <bigtest.txt >/dev/null
real    0m9.430s
user    0m6.660s
sys     0m2.720s

[cfox@elgrande perf]$ time ./t4 <bigtest.txt >/dev/null
real    0m0.268s
user    0m0.250s
sys     0m0.020s

This is alarming, to say the least. Is this a known issue? If not,
what's the correct way to report this?

Thanks for your time!

-- 
Colin Fox
CF Consulting Inc.
cfox@crystalcherry.com