Docker desktop on linux is using a lot of ram-CodePudding

I'm running Docker desktop on Ubuntu 22.04. Every time I start it, it eats a lot of RAM.

    PID USER     %MEM COMMAND
 135264 user      26.0 qemu-system-x86_64 -accel kvm -cpu host -machine q35 -m 3849 -smp 8 -kernel /opt/docker-desktop/linuxkit/kernel -append page_poison=1 vsyscall=emulate panic=1 nospec_store_bypass_disable noibrs noibpb no_stf_barrier mitigations=off linuxkit.unified_cgroup_hierarchy=1    vpnkit.connect=tcp bootstrap client://gateway.docker.internal:35817/95d4e7d4090b2d25b84ed2f2bd2e54523bafd0dfc2e2388838f04b9d045e0fe2 vpnkit.disable=osxfs-data console=ttyS0 -initrd /opt/docker-desktop/linuxkit/initrd.img -serial pipe:/tmp/qemu-console1696356651/fifo -drive if=none,file=/home/lev/.docker/desktop/vms/0/data/Docker.raw,format=raw,id=hd0 -device virtio-blk-pci,drive=hd0,serial=dummyserial -netdev user,id=net0,ipv6=off,net=192.168.65.0/24,dhcpstart=192.168.65.9 -device virtio-net-pci,netdev=net0 -vga none -nographic -monitor none -object memory-backend-memfd,id=mem,size=3849M,share=on -numa node,memdev=mem -chardev socket,id=char0,path=virtiofs.sock0 -device vhost-user-fs-pci,queue-size=1024,chardev=char0,tag=virtiofs0
  10422 user       2.3 /snap/firefox/1883/usr/lib/firefox/firefox
  ...

While docker ps shows that there are no containers running.

I've noticed that there is a mention of 3849M of memory in the command but I can't be entirely sure if it's related, plus it eats way more than 4 gigs.

CodePudding user response：

Well, Docker uses all allocated memory at start, please see

Otherwise, if you want to check how Resources are splitted between running container,

run docker stats to see memory usage of current running containers

See https://docs.docker.com/engine/reference/commandline/stats/

For Example:

CONTAINER ID   NAME                                  CPU %     MEM USAGE / LIMIT     MEM %     NET I/O          BLOCK I/O        PIDS
db6115785a9e   001_jan_twit   0.00%     35.71MiB / 7.774GiB   0.45%     38.6MB / 659kB   16.4kB / 222MB   2