From: Jamie Lokier <lk@tantalophile.demon.co.uk>
To: Alexander Viro <viro@math.psu.edu>, Dan Maas <dmaas@dcine.com>,
Andreas Schwab <schwab@suse.de>,
linux-kernel@vger.kernel.org
Subject: Re: [ACPI] ACPI mentioned on lwn.net/kernel
Date: Sat, 26 Jan 2002 04:59:34 +0000 [thread overview]
Message-ID: <20020126045934.A6016@kushida.apsleyroad.org> (raw)
In-Reply-To: <20020126034559.G5730@kushida.apsleyroad.org> <Pine.GSO.4.21.0201252327001.27397-100000@weyl.math.psu.edu> <20020125233851.B10685@pimlott.ne.mediaone.net>
In-Reply-To: <20020125233851.B10685@pimlott.ne.mediaone.net>; from andrew@pimlott.ne.mediaone.net on Fri, Jan 25, 2002 at 11:38:51PM -0500
Andrew Pimlott wrote:
> > Most likely it says very bad things about getcwd() implementation in Perl
> > compared to sys_getcwd() in the kernel.
>
> No no no--it says very bad things about 'use POSIX', and in general
> about overhead-creep in the perl library.
I ended up calling sys_getcwd from Perl as it's extremely fast. Even
faster if you hard code the syscall number instead of reading the header
file in Perl :-)
However, I was still impressed by the 0.0075s for a pipe/fork/exec.
'use POSIX' is very slow, but Perl's getcwd() is pretty slow too -- it
does the old fashioned directory walk. We cannot blame it for being
portable.
-- Jamie
next prev parent reply other threads:[~2002-01-26 5:04 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <fa.juevf8v.1u7ubb8@ifi.uio.no>
[not found] ` <fa.h3u09pv.1v2k3bm@ifi.uio.no>
2002-01-26 2:12 ` [ACPI] ACPI mentioned on lwn.net/kernel Dan Maas
2002-01-26 3:45 ` Jamie Lokier
2002-01-26 4:33 ` Alexander Viro
2002-01-26 4:38 ` Andrew Pimlott
2002-01-26 4:59 ` Jamie Lokier [this message]
2002-01-26 5:11 ` Jamie Lokier
2002-01-27 23:58 Dieter Nützel
[not found] <200201251550.g0PFoIPa002738@tigger.cs.uni-dortmund.de.suse.lists.linux.kernel>
[not found] ` <200201250802.32508.bodnar42@phalynx.dhs.org.suse.lists.linux.kernel>
[not found] ` <jeelkes8y5.fsf@sykes.suse.de.suse.lists.linux.kernel>
[not found] ` <a2sv2s$ge3$1@penguin.transmeta.com.suse.lists.linux.kernel>
[not found] ` <20020126034106.F5730@kushida.apsleyroad.org.suse.lists.linux.kernel>
[not found] ` <012d01c1a687$faa11120$0201a8c0@HOMER.suse.lists.linux.kernel>
2002-01-26 22:43 ` Andi Kleen
-- strict thread matches above, loose matches on Subject: below --
2002-01-25 15:42 Moore, Robert
2002-01-25 15:50 ` Horst von Brand
2002-01-25 16:02 ` Ryan Cumming
2002-01-25 16:15 ` Andreas Schwab
2002-01-25 20:05 ` Ryan Cumming
2002-01-26 1:00 ` Linus Torvalds
2002-01-26 3:41 ` Jamie Lokier
2002-01-26 16:39 ` Martin Eriksson
2002-01-26 16:47 ` Jeff Garzik
2002-01-26 17:48 ` Jamie Lokier
2002-01-26 18:25 ` Martin Eriksson
2002-01-26 21:42 ` Linus Torvalds
2002-01-30 9:22 ` Andrey Panin
[not found] ` <Pine.LNX.4.33.0201291412590.18804-100000@coffee.psychology.mcmaster.ca>
2002-01-30 8:00 ` Andrey Panin
2002-01-26 17:33 ` Felix von Leitner
2002-01-26 19:40 ` Florian Weimer
2002-01-27 13:56 ` Martin Dalecki
2002-01-25 2:15 Therien, Guy
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