use MALLOC_PERTURB_ ... or lose
dmalcolm at redhat.com
Wed May 5 17:21:25 UTC 2010
On Wed, 2010-05-05 at 18:24 +0200, Michal Schmidt wrote:
> On Wed, 05 May 2010 17:30:29 +0200 Jim Meyering wrote:
> > I propose (seriously, now) to add this to /etc/profile,
> > or to some always-sourced file like /etc/profile.d/glibc.sh:
> > # Enable glibc's malloc perturbing feature in Rawhide.
> > # http://udrepper.livejournal.com/11429.html
> > read _f _r _n _code_name < /etc/redhat-release &&
> > case $_code_name in
> > *Rawhide*) export MALLOC_PERTURB_=$((RANDOM % 255 + 1)) ;;
> > esac
> Would export MALLOC_CHECK_=3 be a useful addition too?
I like the idea of rawhide-only debug checks like this, but can we add
some kind of message to login like this:
This is a pre-release version of Fedora, and is running with extra
diagnostics that help find bugs, but impact performance.
(LINK TO A WIKI PAGE)
before attempting to run benchmarks on this system.
Is there a good place to add this? e.g. /etc/issue ? I'm not sure of
how to handle a conditional there.
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