This is the mail archive of the libc-help@sourceware.org mailing list for the glibc project.

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]
Other format:	[Raw text]

Re: sscanf ~1000 slower that strtol

From: Mike Frysinger <vapier at gentoo dot org>
To: Michael Williamson <michael dot h dot williamson at gmail dot com>
Cc: libc-help at sourceware dot org
Date: Wed, 1 Jun 2016 14:53:48 -0400
Subject: Re: sscanf ~1000 slower that strtol
Authentication-results: sourceware.org; auth=none
References: <CAKZygbcyX4kygLSq_BM9uS7HZYQpyOo6TQQwvLip2QHd-ZoF-g at mail dot gmail dot com>

On 01 Jun 2016 10:50, Michael Williamson wrote:
> I have a question. I was comparing the speed of reading some ASCII
> integers by different methods, and I found that using sscanf (with the
> characters consumed operand (%n)) is ~1000
> slower than the fastest method, strtol. Why is it so slow?
> 
> I am using version ldd (Ubuntu EGLIBC 2.15-0ubuntu10.12) 2.15.

that's 4+ years old.  can you retest with something less ancient ?
-mike

Attachment: signature.asc
Description: Digital signature

Follow-Ups:
- Re: sscanf ~1000 slower that strtol
  - From: Michael Williamson

References:
- sscanf ~1000 slower that strtol
  - From: Michael Williamson

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]