Questions tagged [atop]
Atop is an ASCII full-screen performance monitor that is capable of reporting the activity of all processes (even if processes have finished during the interval), daily logging of system and process activity for long-term analysis, highlighting overloaded system resources by using colors, etc.
31 questions
0 votes
1 answer
222 views
atop is not logging daily
I installed atop on Rocky 9 to monitor CPU spike issues. On 2/8/2024 (2 days ago) I enabled and started atop: systemctl enable atop systemctl start atop Thus, a file was created in /var/log/atop ...
1 vote
0 answers
204 views
When using atop as a systemd service it only runs and logs to file once
I am on CentOS 7 and using atop v2.6.0 If I run atop manually with the following command everything runs as expected and the log is written to every 10 seconds: /usr/bin/atop -w /var/log/atop/...
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2 votes
1 answer
499 views
What are "shrss" / "shswp" in atop?
From atop manual (official): MEM - Memory occupation. This line contains the total amount of physical memory (tot), [...] the resident size of shared memory including tmpfs (shmem), the ...
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3 votes
1 answer
4k views
atop shows `swout` (swapping) when I have gigabytes of free memory. Why?
Why did atop show that I was swapping out over 20,000 pages - over 80 megabytes - when I had gigabytes of free memory? I have not noticed a performance problem with this. I simply wish to take the ...
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3 votes
1 answer
4k views
IO wait time is higher than disk utilization. Isn't this impossible? [duplicate]
I am trying to improve my understanding, following this (so far) unanswered question: Possible limiting factor during upgrade of Fedora VM - not disk or cpu or network? I ran the following test load, ...
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1 vote
0 answers
32 views
Possible limiting factor during upgrade of Fedora VM - not disk or cpu or network? [duplicate]
I'm upgrading a VM from Fedora 29 to Fedora 30. I triggered the update from inside GNOME Software. It downloaded the upgrade, and asked to reboot. It started installing... atop shows the qemu ...
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2 votes
1 answer
734 views
Why does atop open a raw socket?
I install atop on Debian 9. It runs as a monitoring daemon. Why is it listening on a raw socket? Raw sockets are used to generate arbitrary IPv4 packets or capture all packets read all packets for ...
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2 votes
0 answers
897 views
atop shows queue depth is higher than maximum
In my atop logs, I see avq ("average queue depth") over 600. This is on an LVM Logical Volume (LV). Both the LV and the physical volume have nr_requests (maximum queue depth) of 128. (Note, to see ...
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