Cgroups

Install

• apt-get install cgroup-bin cgroup-lite cgroup-tools cgroupfs-mount libcgroup1

Create

• cat /etc/cgconfig.conf

Ist bei Ubuntu leer

Kontrolle

• lssubsys -am

cpuset /sys/fs/cgroup/cpuset
cpu,cpuacct /sys/fs/cgroup/cpu,cpuacct
blkio /sys/fs/cgroup/blkio
memory /sys/fs/cgroup/memory
devices /sys/fs/cgroup/devices
freezer /sys/fs/cgroup/freezer
net_cls,net_prio /sys/fs/cgroup/net_cls,net_prio
perf_event /sys/fs/cgroup/perf_event
hugetlb /sys/fs/cgroup/hugetlb
pids /sys/fs/cgroup/pids

Anlegen einer Control Group

• cgcreate -g blkio:/mygroup

Checken

• lscgroup | grep blkio:/dd

blkio:/dd

Welche Parameter sind Subsystem Block-I/O vorhanden

• cgget -g blkio /dd

/dd:
blkio.throttle.io_serviced: Total 0
blkio.io_service_bytes_recursive: Total 0
blkio.io_serviced_recursive: Total 0
blkio.time:
blkio.io_serviced: Total 0
blkio.reset_stats:
blkio.io_wait_time: Total 0
blkio.weight: 500
blkio.leaf_weight_device:
blkio.throttle.read_iops_device:
blkio.io_merged_recursive: Total 0
blkio.throttle.write_bps_device:
blkio.leaf_weight: 500
blkio.sectors_recursive:
blkio.weight_device:
blkio.io_service_time_recursive: Total 0
blkio.throttle.write_iops_device:
blkio.throttle.io_service_bytes: Total 0
blkio.io_service_bytes: Total 0
blkio.io_wait_time_recursive: Total 0
blkio.io_service_time: Total 0
blkio.time_recursive:
blkio.io_merged: Total 0
blkio.throttle.read_bps_device:
blkio.sectors:
blkio.io_queued: Total 0
blkio.io_queued_recursive: Total 0

Geschwindigkeit einschränken

• echo "8:16 1048576" > /sys/fs/cgroup/blkio/dd/blkio.throttle.write_bps_device

Ohne Einschränkung

• dd if=/dev/zero of=/tmp/test count=50 bs=100M

50+0 records in
50+0 records out
5242880000 bytes (5.2 GB, 4.9 GiB) copied, 23.0043 s, 228 MB/s

Mit Einschränkung

• cgexec -g blkio:/dd dd if=/dev/zero of=/tmp/test count=50 bs=100M

Links

• http://www.geeksforgeeks.org/linux-virtualization-resource-throttling-using-cgroups/
• http://www.admin-magazin.de/Das-Heft/2011/06/Cgroups-zur-Ressourcenkontrolle-in-Linux
• https://askubuntu.com/questions/836469/install-cgconfig-in-ubuntu-16-04
• https://www.devinhoward.ca/technology/2015/feb/implementing-cgroups-ubuntu-or-debian