CPU Spike Java

[milty456]

Ubuntu 20.04
Prox Mox 6.2-12

I install the linux vm, with 2 cores, and the application i use that relies on java spikes the cpu to 196% and doesn't work.(Java process is spiking)
I change the CPU to 1 core and it works fine.
Why can't i use 2 cores on my VM?

It's a haswell processor with 1 socket 4 cores.

I've tried every setting in proxmox, and can't get it to work.

 

[Dominic]

Could you please post

qm config <vmid>

?

 

[woima]

I have similar problem. I had 3 dockers on this VM running java application and all went well, but after starting 4th java-docker all cpu:s jumped to 100% (this one process uses all). Strace for this process "hangs" in FUTEX_WAIT. Normally this java-process just idles.
I have a vague memory that java and the number of processors would have caused me a similar problem before.

Ubuntu 18.04, Linux 5.15.0-122

agent: 1
balloon: 0 #same with 1
bootdisk: scsi0
cores: 10
memory: 16384
numa: 1
ostype: l26
scsihw: virtio-scsi-pci
smbios1: uuid=4a721b60-7e43-4963-b840-bfd9c6d00a2e
sockets: 1
tablet: 0

 

[jhonii]

please post






snaptube vidmate word to pdf

 

[Dominic]

Depending on what processor your host system has, it might make sense to give the cpulimit configuration a try.

 

[milty456]

Ubuntu 20.04
Prox Mox 6.2-12

I install the linux vm, with 2 cores, and the application i use that relies on java spikes the cpu to 196% and doesn't work.(Java process is spiking)
I change the CPU to 1 core and it works fine.
Why can't i use 2 cores on my VM?

It's a haswell processor with 1 socket 4 cores.

I've tried every setting in proxmox, and can't get it to work.

Hi Dominic,

Some more info: An engineer friend of mine set up a "container" instead of a VM, and it works. So it's really weird.
I've tried messing with the CPU limit as well as other settings, still can't get the VM to work properly in terms of CPU usage.

Here you go:

balloon: 0
bootdisk: scsi0
cores: 2
cpu: kvm64
cpulimit: 1
ide2: none,media=cdrom
kvm: 0
memory: 4096
name: OpenHab2.5
net0: e1000=7A:42C:08:B1:C5,bridge=vmbr0,firewall=1
numa: 0
ostype: l26
parent: OpenhabInstalled
scsi0: local-lvm:vm-101-disk-0,size=75G
scsihw: virtio-scsi-pci
smbios1: uuid=ed2ed573-83f8-4790-becb-3b650a54e84c
sockets: 1
vcpus: 2
vmgenid: 5b0f1b24-2f9b-42b3-a4b5-037354e2c3ce
root@ProxMox2:~#