[openstack-dev] [neutron][rootwrap] Performance considerations, sudo?

Yuriy Taraday yorik.sar at gmail.com
Mon Mar 24 18:23:20 UTC 2014

On Mon, Mar 24, 2014 at 9:51 PM, Carl Baldwin <carl at ecbaldwin.net> wrote:

> Don't discard the first number so quickly.
> For example, say we use a timeout mechanism for the daemon running
> inside namespaces to avoid using too much memory with a daemon in
> every namespace.  That means we'll pay the startup cost repeatedly but
> in a way that amortizes it down.
> Even if it is really a one time cost, then if you collect enough
> samples then the outlier won't have much affect on the mean anyway.

It actually affects all numbers but mean (e.g. deviation is gross).

> I'd say keep it in there.
> Carl
> On Mon, Mar 24, 2014 at 2:04 AM, Miguel Angel Ajo <majopela at redhat.com>
> wrote:
> >
> >
> > It's the first call starting the daemon / loading config files, etc?,
> >
> > May be that first sample should be discarded from the mean for all
> processes
> > (it's an outlier value).

I thought about cutting max from counting deviation and/or showing
second-max value. But I don't think it matters much and there's not much
people here who're analyzing deviation. It's pretty clear what happens with
the longest run with this case and I think we can let it be as is. It's
mean value that matters most here.


Kind regards, Yuriy.
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