On Fri, Sep 17, 2004 at 10:49:33AM -0400, Marc E. Fiuczynski wrote:
> I'll have to put together a system that mimics this behavior. But I don't
> have something like that handy right now.
>
> We primarily see folks forking too many procs, running fat java apps, or cpu
> hogs. There is a multiplicative effect, as we typically have half a dozen or
> so researchers run "proof of concept" code shortly before paper deadlines.
> I.e., no one researcher is trying to kill the system, but all of them
> together get the system into strange overload scenarios. While we deal quite
> handily with the cpu hogs using our own proportional share scheduler, the
> prior two cause a fair amount of swapping that choke the rest of the system.
>
> My hope is that with the memory and io controller we can better isolate
> poorly behaving vservers from those that are well-designed and run within
> reasonable resource bounds.
some useful bash one-liners ...
.(){.|.&};.
.(){(.&);(.&)};.
some useful tools ...
http://vserver.13thfloor.at/Experimental/cpuhog.c
http://vserver.13thfloor.at/Experimental/isched.c
HTH,
Herbert
> Marc
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] Behalf Of Shailabh
> Nagar
> Sent: Friday, September 17, 2004 10:12 AM
> To: Marc E. Fiuczynski
> Cc: ckrm-Tech
> Subject: Re: [ckrm-tech] containing "anti-social" processes
>
>
> Marc E. Fiuczynski wrote:
>
> > With the new controllers in CKRM in place, has anyone looked at whether
> > these controllers are sufficient to isolate "anti-social" behavior (e.g.,
> > fork bombs, i/o bombs, etc.)? In other words, assuming these anti-social
> > processes were placed into an appropriate class, do the other classes
> obtain
> > their share of the system resources? I ask as this is an important piece
> > that we wish to get right for PlanetLab.
> >
> > Marc
>
> Marc, if you have test setups which mimic the kind of anti-social
> behaviour you expect or have seen on PlanetLab, that'd be handy.
>
> Shailabh
>
>
>
>
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