On 6/9/22 11:08 AM, Roger Heflin wrote:
How did you determine the cpu activity?
a. "% CPU% column in the "Processes" tab of gnome's "System Monitor".
b. the "CPU" (top) plot in the "Resources" tab of gnome's "System Monitor".
c. the "CPU %" column in the "Process Table" tab of kde's "ksysguard".
d. the "CPU History" (top) plot in the "System Load" tab of kde's
"ksysguard".
e. the "%CPU" column in the output generated by the "top" command
running in a terminal.
a, c, and e seem to approximately agree with each other.
b and d seem to approximately agree with each other.
But a, c, and e seem to disagree by a large amount with b and d.
Processes doing a lot of disk io operations will cause a lot of "D"
states and will show in the load average but are generally using little
or no actual cpu and won't show up on top.
And potentially creating (or attempting) to create links would be doing
a lot of trivial disk iops that spend a lot of time waiting on the disk.
What kind of disk is the OS on? Even with a ssd the iop takes some
small amount of real time (typically about 10-50us) but is a huge amount
of time compared to the few cpu cycles it takes to create the iop.
Seagate BarraCuda 3.5 (CMR) ST2000DM006-2DM164, 2.00 TB.
The 15-20 minute problem was occurring either
- at the end of the clean-up phase of the "dnf upgrade"; or
- between the clean-up phase and the verifying phase of the "dnf
upgrade"; or
- at the start of the verifying phase of the "dnf upgrade".
On Thu, Jun 9, 2022 at 11:48 AM home user <mattisonw@xxxxxxxxxxx
<mailto:mattisonw@xxxxxxxxxxx>> wrote:
This seems to have also fixed another problem. For the past few weeks,
the weekly "dnf upgrade" would take some 15-20 minutes doing some
"invisible" work, I think it was at the end of the cleanup phase. The
system monitor graph would show lots of CPU activity during that 15-20
minutes, but the system monitor process table and "top" would show very
few or no processes using more than 1% CPU. This workstation is a 3+
GHz, quad-core, 8 CPU machine. This did not occur during today's "dnf
upgrade". It does bother me that CPU-intensive processes seems to be
able to hide from "top" and the system monitor process table.
I do agree with Roger also. Some part of the patching process was not
being done properly.
I've marked this thread "SOLVED". Thank-you Samuel and Roger.
Bill.
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