Re: yum update took 99.99% of cpu

[JD <jd1008@xxxxxxxxx>]

On Sat, Jun 28, 2014 at 3:18 AM, Michael Schwendt <mschwendt@xxxxxxxxx> 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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