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Re: Removal of unexec support from glibc malloc

From: Wolfgang Jenkner
Subject: Re: Removal of unexec support from glibc malloc
Date: Tue, 19 Jan 2016 14:27:21 +0100
User-agent: Gnus/5.130014 (Ma Gnus v0.14) Emacs/25.1.50 (berkeley-unix)

On Mon, Jan 18 2016, Paul Eggert wrote:

> ./configure emacs_cv_var_doug_lea_malloc=no
> This causes Emacs to use its own malloc implementation. Back then
> I observed that this hurt performance somewhat (text 0.5% larger, data
> 7.6% larger, 14% more CPU time on my usual benchmark) but I did not
> observe any bugs; see
> <https://lists.gnu.org/archive/html/emacs-devel/2014-02/msg00542.html>.

IIUC, this means that either mmap or src/ralloc.c is needed for memory
reallocations, and those do have very annoying performance problems in
non-contrived cases, please see bug#19393 for such a scenario.

The discussion about the performance problem begins at


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