Noble (6.8) got fixed already in 6.8.0-40-generic as a part of bug
2070349.
** Changed in: linux (Ubuntu Noble)
Status: In Progress => Fix Released
** Description changed:
BugLink: https://bugs.launchpad.net/bugs/2069961
[Impact]
On large systems, e.g. with 512 cpus or more, turbostat fails to run due
to exceeding the rlimit for number of files. 512 cpus requires 1028 file
descriptors, but the current limit is 999.
$ lscpu
...
CPU(s): 512
On-line CPU(s) list: 0-511
...
$ sudo turbostat
...
turbostat: /sys/devices/system/cpu/cpu477/cpuidle/state0/usage: open failed:
Too many open files
There is no workaround, apart from maybe using powerstat instead.
[Fix]
The fix is to increase the rlimit to increase the amount of file
descriptors that turbostat can open to 2^15, which should be plenty for
some time to come.
commit 3ac1d14d0583a2de75d49a5234d767e2590384dd
Author: Wyes Karny <wyes.ka...@amd.com>
Date: Tue Oct 3 05:07:51 2023 +0000
Subject: tools/power turbostat: Increase the limit for fd opened
Link:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3ac1d14d0583a2de75d49a5234d767e2590384dd
- This landed in 6.9-rc4, and is a clean cherry pick to jammy and noble.
+ This landed in 6.9-rc4, and is a clean cherry pick to jammy. Noble got
+ fixed already through upstream stable.
[Testcase]
Deploy a bare metal system with 512 or more cpus.
Install linux-tools:
$ sudo apt install linux-tools-$(uname -r)
Run turbostat:
$ sudo turbostat
...
turbostat: /sys/devices/system/cpu/cpu477/cpuidle/state0/usage: open failed:
Too many open files
There are test kernels available in the following ppa:
https://launchpad.net/~mruffell/+archive/ubuntu/sf388491-test
If you install them, you should be able to see normal turbostat output
for all cpus installed in the system.
[Where problems can occur]
We are simply increasing the rlimit for file descriptors that turbostat
can open. This should have no impact on any existing systems.
If a regression should occur, then turbostat functionality might not
work. Users could use powerstat instead as a workaround while things are
fixed.
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https://bugs.launchpad.net/bugs/2069961
Title:
turbostat fails with too many open files on large systems
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