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Date: Thu, 3 Apr 1997 19:21:42 +0400 (MSD)
From: "Alexander V. Lukyanov" <lav@video.yars.free.net>
Message-Id: <199704031521.TAA03420@video.yars.free.net>
To: bugs@FreeBSD.org
Subject: sscanf is slow on 2.2.1
Sender: owner-bugs@FreeBSD.org
X-Loop: FreeBSD.org
Precedence: bulk

The program below works awfully slowly on FreeBSD 2.2.1, and quite normally
on Solaris 2.5, Linux, Digital Unix etc.

Linux on i586 100Mhz:
real    0m26.020s
user    0m24.240s
sys     0m0.400s

FreeBSD 2.1.5 on i586 66Mhz:
      104.06 real        51.97 user         0.00 sys

FreeBSD 2.2.1 on i586 133Mhz:
      737.01 real       588.48 user         0.43 sys

More than 10 times slower than 2.1.5 on a weaker system.
Obviously, that time is spent inside libc.

---
#include <stdio.h>
int main()
{
int i;
char str[256];
for(i=0; i<1000000; i++)
	sscanf("abcde","%255[a-zA-Z]",str);
return 0;
}
---
   Alexander.