[Swan-dev] test suite slower

[Andrew Cagney]

On 3 August 2016 at 11:09, Andrew Cagney <andrew.cagney at gmail.com> wrote:
> Perhaps it's related to the way the file systems are now created (see
> earlier e-mail about clone).  The disk images were set up with backing
> store:
>
>   swanfedorabase <- east, west ....
>
> but now there is an extra level vis:
>
>   swanfedorabase <- clone <- east, west, ....
>
> For instance:

High and I have been exchanging large logs, and eventually noticed
domains are becoming wedged, taking minutes to reboot vis:

a.virsh road 3:32:16.02/3:23.03: domain failed to boot after 180.1
seconds, waiting 20 seconds for it to power down
a.virsh road 3:32:36.03/3:43.04: domain failed to power down after
20.1 seconds, waiting 20 seconds for the power cord to be pulled
a.virsh road 3:32:36.05/3:43.06: domain appears to have switched off
after 0.2 seconds
a.virsh road 3:32:36.05/3:43.06: starting domain
a.virsh road 3:32:38.00/3:45.01: waiting 180 seconds for login prompt
a.virsh road 3:32:51.07/3:58.08: login prompt appeared after 13.7 seconds
a.virsh road 3:32:51.08/3:58.09: waiting 120 seconds for login prompt;
5 seconds for password prompt; 5 seconds for shell prompt
a.virsh road 3:32:52.01/3:59.02: We're in after 0.3 seconds!
a.runner newoe-25-cat-2 road 3:32:52.04/3:59.05: 'cd' to
/testing/pluto/newoe-25-cat-2
b.virsh west 3:32:52.04/3:31.05: starting domain
a.runner newoe-25-cat-2 3:32:52.04/3:59.05: stop booting domains after
239.6 seconds

It happens ~100 times during Hugh's test run which, using a back of
envelope calculation, seems sufficient to explain the multi-hour slow
down.

While this explains where the slow down is coming from, it doesn't
explain why KVM becomes totally wedged :-(

Andrew

PS: it doesn't seem to be related to clones.