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?
Does that impose much of a performance impact?
I haven't used it or measured it enough to know off hand.
Even using MALLOC_PERTURB_=... imposes *some* cost, both in
space and in time. I confess that I haven't measured it, either.
Rawhide already has (had?) a reputation for being slightly slower due to
added instrumentation e.g., in the kernel, so there is precedent.