KAGRA Logbook

VAC (General)

takaaki.yokozawa - 8:02 Tuesday 06 June 2023 (25517)

Current vacuum monitor

I checked the current status of vacuum monitor.

1. Slow process of the ssh
Sometimes, we need so long time to perform the ssh (Usually ~a few second, but sometimes ~minute)

2. Unrecognized the numpy
File "/home/pi/ws/cc-10_exc.py", line 4, in
import numpy as np
File "/usr/lib/python2.7/dist-packages/numpy/__init__.py", line 142, in
from . import add_newdocs
File "/usr/lib/python2.7/dist-packages/numpy/add_newdocs.py", line 13, in
from numpy.lib import add_newdoc
File "/usr/lib/python2.7/dist-packages/numpy/lib/__init__.py", line 18, in
from .polynomial import *
File "/usr/lib/python2.7/dist-packages/numpy/lib/polynomial.py", line 20, in
from numpy.linalg import eigvals, lstsq, inv
File "/usr/lib/python2.7/dist-packages/numpy/linalg/__init__.py", line 51, in
from .linalg import *
File "/usr/lib/python2.7/dist-packages/numpy/linalg/linalg.py", line 29, in
from numpy.linalg import lapack_lite, _umath_linalg
ImportError: /usr/lib/python2.7/dist-packages/numpy/linalg/lapack_lite.arm-linux-gnueabihf.so: failed to map segment from shared object

We need to modify the environment of raspberry pi(?)

Comments to this report:

takahiro.yamamoto - 2:09 Wednesday 07 June 2023 (25540)

I'm not sure that following things are related to the instability of the vacuum monitor or not.
They are just my impression by seeing raspberry pi itself, script, etc.

On some of raspberry pi, system time is several days different from correct date.
=> There is some possibility to appear conflicts related to a file timestamp.

Some kind of errors related to Wi-Fi/bluetooth are periodically shown in dmesg, journalctl, etc.
=> Disabling them helps to reduce CPU load. Because wired LAN is used on vacuum monitors(?), wireless communication can be stopped.

Bundling SSH sessions may reduce the authentication load.
=> e.g. "-oControlMaster auto -oControlPath ~/.ssh/vacuum-%r@%h:%p -oControlPersist 600"

EOL treatment should be done correctly in the cc-10 script.
=> Though cc-10 returns CR, but serial.readline() expects "LF" as EOL. So serial.readline() is always finished by timeout.

Error log by vacuum.sh becomes always blank. So we cannot do bug checks at all.
=> Redirect ">" is used instead of ">>". (Maybe it's just a coding bug.)

takaaki.yokozawa - 3:37 Wednesday 07 June 2023 (25541)

[Ikeda, Hayakawa, Yokozawa]

Ikeda-san noticed that the used memory was almost full (Reason is unknown).
(Even sometimes we could not perform ls)
So we decided to reboot the raspberry pi by unplug and plug the power supply at Xend.
After come back to analysis building, the memory problem was solved, but one USB was not recognized.
I enter the mine again and found unplugged USB, after fix it, all raspberry pi at Xend start working.
Anyway, please let me know if you noticed some trouble in vacuum monitor.

takaaki.yokozawa - 9:32 Friday 09 June 2023 (25563)

> Error log by vacuum.sh becomes always blank. So we cannot do bug checks at all.
> => Redirect ">" is used instead of ">>". (Maybe it's just a coding bug.)
Thank you for your notification, I fixed it.