[PLUG] strange system behavior - inotify problem?
American Citizen
website.reader3 at gmail.com
Sat Dec 2 18:52:40 UTC 2023
Hello:
I have a very interesting problem occurring my opensuse Leap 15.5 linux
system.
I am crunching number theory modules, using magma to do descents on
elliptic curves. I do open a new konsole screen and do a tail on the
magma results, in real time. There are 6 magma programs executing in
this way at the same time.
I also have 3 monitoring programs, but they are set up as a bash script
file with a while [ 1 ] loop, but each has a sleep nnn seconds at the
end of the loop.
I was getting occasionally the tail warning message, no files left for
tail, using polling instead.
I installed the inotify-comment bash script from the stackexchange web
page
https://unix.stackexchange.com/questions/15509/whos-consuming-my-inotify-resources.
Running this script does not show anything unusual, I am only using 402
watches in 131 instances. I did up the values in the sysctl.conf file to
large sizes, so I don't suspect that the problem is caused by this.
The system strangely halts the start of a new process, for up to 20 secs
at a time, for example, I tried to open up a new Konsole screen and the
window opens up, but then sits there for a period of time before
completing the interior of the screen.
Another example, while typing this email, I made a mistake and had to
back up, the moment I hit the backspace key, everything froze for about
10 secs or so, before resuming.
Third example, one of my monitoring screens suddenly went into
uninterruptable mode, trying using control-C did not work, I had to
terminate the Konsole screen and restart the bash script over again in a
new window.
Right now I don't know quite what to do? This is slowing things way down
for me, while the system seems fine, I am only using 4 gigs of the 32
gigs system RAM, so that should not be a problem.
Puzzled -
Randall
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