GNU bug report logs - #24720
Performance impact of -no-pie

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Package: emacs;

Reported by: Paul Eggert <eggert <at> cs.ucla.edu>

Date: Mon, 17 Oct 2016 20:20:02 UTC

Severity: normal

Done: Paul Eggert <eggert <at> cs.ucla.edu>

Bug is archived. No further changes may be made.

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#24720: closed (Performance impact of -no-pie)
Date: Tue, 18 Oct 2016 16:22:02 +0000

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Your message dated Tue, 18 Oct 2016 09:21:27 -0700
with message-id <4d1c0064-570f-e2fe-a391-101dbe535d1f <at> cs.ucla.edu>
and subject line Re: bug#24720: Performance impact of -no-pie
has caused the debbugs.gnu.org bug report #24720,
regarding Performance impact of -no-pie
to be marked as done.

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24720: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=24720
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[Message part 2 (message/rfc822, inline)]
From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Emacs bug reports <bug-gnu-emacs <at> gnu.org>
Cc: Alex <agrambot <at> gmail.com>
Subject: Performance impact of -no-pie
Date: Mon, 17 Oct 2016 13:18:51 -0700

(The rest of this message is copied from Alex's email archived at 
<http://lists.gnu.org/archive/html/emacs-devel/2016-10/msg00451.html>.)

After being forced to add -no-pie to my CFLAGS in order to build Emacs with a recent GCC, my startup time for my whole config (with -nw) has increased from ~1 second to ~2 seconds.

The startup time for `emacs -Q -nw` went up from about 0.07s to 0.14s; again it's about twice as slow.

The -Q time doesn't worry me, but the extra second for my main configuration isn't pleasant.

Is such a performance impact expected? If so, is there a plan to regain the old speed?




[Message part 3 (message/rfc822, inline)]
From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Glenn Morris <rgm <at> gnu.org>, Alex <agrambot <at> gmail.com>
Cc: 24720-done <at> debbugs.gnu.org
Subject: Re: bug#24720: Performance impact of -no-pie
Date: Tue, 18 Oct 2016 09:21:27 -0700

On 10/18/2016 08:59 AM, Glenn Morris wrote:
> I'm going to guess that when you set it via CFLAGS, you lost the -O2
> that is otherwise part of the default CFLAGS.

Yes, that sounds quite plausible. Thanks for the diagnosis. Closing the bug.
This bug report was last modified 8 years and 208 days ago.

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