Re: use MALLOC_PERTURB_ ... or lose
On 05/05/2010 12:21 PM, David Malcolm wrote:
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:
Agreed, I'm tired of (insert random benchmarking site) saying "OH NOES!
Fedora got SLOWER AGAIN!" when it's really a lot of debug going on.
Stating something like this clearly on login & install would be nice,
not just for this MALLOC_PERTURB_ change but in general.
-Eric
<idea>
This is a pre-release version of Fedora, and is running with extra
diagnostics that help find bugs, but impact performance.
Please read
(LINK TO A WIKI PAGE)
before attempting to run benchmarks on this system.
</idea>
Is there a good place to add this? e.g. /etc/issue ? I'm not sure of
how to handle a conditional there.
Dave