Whole machine hangs during upgrade

[uwe_keim]

I’m trying but getting this:

$ echo 'sys.kernel.mm.transparent_hugepage.enabled=never' > /etc/sysctl.d/10-huge-pages.conf
-bash: /etc/sysctl.d/10-huge-pages.conf: Permission denied
$ sudo echo 'sys.kernel.mm.transparent_hugepage.enabled=never' > /etc/sysctl.d/10-huge-pages.conf
-bash: /etc/sysctl.d/10-huge-pages.conf: Permission denied

My server is an Ubuntu Server 22.04.3 LTS.

[Firepup650 (Firepup Sixfifty)]

Try running it in a root shell, it might be struggling with being in a normal shell. (You’re sudoing the echo, but not the pipe to the file)

[Ed_S]

Indeed, several ways to do it, here’s one

sudo sh -c "echo 'sys.kernel.mm.transparent_hugepage.enabled=never' > /etc/sysctl.d/10-huge-pages.conf"

[uwe_keim]

I’ve ran the scripts and rebooted.

Then:

$ cat /proc/sys/vm/overcommit_memory
1

and

$ cat /sys/kernel/mm/transparent_hugepage/enabled
always [madvise] never

(So first thing changed from 0 to 1 but second thing still returns the same).

[Ed_S]

Odd. What do you get from

cat /etc/sysctl.d/10-huge-pages.conf

Perhaps try the echo again?

[Ed_S]

Oh wait, the two lines to run are supposed to write to two different files. Looks like you’ve written to the same file twice.

[Firepup650 (Firepup Sixfifty)]

Is it perhaps supposed to be always [madvise] never?

@Ed_S

report the output of these commands

cat /proc/sys/vm/overcommit_memory 
cat /sys/kernel/mm/transparent_hugepage/enabled 

On my systems I have

# cat /proc/sys/vm/overcommit_memory 
1
# cat /sys/kernel/mm/transparent_hugepage/enabled 
always madvise [never]

[Ed_S]

Not according to the Opinionated Guide. Hugepages not a win in normal circumstances, I gather - experts who want to enable them are presumably expert enough to do it right.

[uwe_keim]

$ cat /etc/sysctl.d/10-huge-pages.conf
sys.kernel.mm.transparent_hugepage.enabled=never

Not a big deal, I do think the system works good enough .

[Ed_S]

More important to get the overcommit setting right, I think

[anon36555649]

@Jagster

And that is another thing I can’t understand: why others hit low memory and I, who uses a lot plugins and components, had zero issues what makes that difference?

Could be the type of processor for the server might make a difference?

[Ed_S]

ARM vs x86? Just possibly. I see someone somewhere wondered if having more CPUs might mean more threads run and so use more memory - that just might be. Of course the biggest difference is the forum content, but I’m not sure how much difference that could make. I think some steps in upgrade are database scheme tweaks.

And then there are the kernel tunables… but in this case @Jagster had the same settings as @uwe_keim .

[Jagster (Jakke Lehtonen)]

Intel x86, 2 vcpu.

Quite common setup for smaller forums I would say.