yum update took 99.99% of cpu

[JD]

On Sat, Jun 28, 2014 at 3:18 AM, Michael Schwendt <mschwendt at gmail.com>
wrote:

> On Fri, 27 Jun 2014 17:02:20 -0600, JD wrote:
>
> > FC20.
> >
> > I ran yum -y update.
> > After all the files were downloaded, the delta processing started. From
> > there on, all the way through to the end of
> > installation and cleanup, cpu was 99.99% taken up
> > by the update process, and the entire desktop became
> > unresponsive. I was unable to switch display windows,
> > of which I had 6.
> >
> > The update had downloaded a total of 161MB, for a total
> > of about 30 updates, most of them wine related.
> >
> > The machine is a dual core Intel running at 2.4GHz,
> > with 4GB ram.
>
> CPU speed and 99% usage shouldn't be the problem here.
> Rather a bottleneck related to massive I/O and slow storage?
> Or an odd case of heavy memory usage that lead to swapping.
>
>
​Heavy I/O should at most create an I/O bottleneck,
since a process waiting either for free buffer of waiting
for I/O completion does not consume cpu, as it is put to sleep
until awakened by a signal that the requested buffer is
available, or the I/O completed.​
The next time I do an update, I will also run top and iotop
and take periodic screen snapshots and will upload the images
to a public storage and provide the URL for all to see.
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