Linux cgroups (control groups) allow limiting and accounting for resources on a system, including CPU, memory, and block I/O.

learn more… | top users | synonyms

2
votes
2answers
124 views

Need help finding the CPU id numbers to use with cpu sets

The man for cpuset doesn't seem to clearly list how to figure out which numbers map to which processing units. My current machine has two Intel Xeon E5645s, each of which has 6 cores and ...
6
votes
1answer
166 views

Can you throttle the bandwidth to a tmpfs based ramdisk?

I created a ramdisk using tmpfs as follows: sudo mount -t tmpfs -o size=1024m tmpfs /myramdisk I was looking into cgroup blkio subsystem bandwidth limits "read_bps_device" and "write_bps_device" ...
3
votes
1answer
306 views

What priorities can be used in cgroups net_prio module?

Cgroups has a module called net_prio, and by using this module I can set the priority of network traffic generated by various applications. As you can read here, this can be achieved by setting ...
0
votes
1answer
19 views

How do I read from memory.pressure_level in a cgroup?

I want to see the memory pressure of the cgroup. But simple cat memory.presure_level fails. How do I know the current memory pressure of a cgroup?
0
votes
1answer
179 views

Fedora 20 memory.limit_in_bytes not working

Fedora 29 (kernel 3.15.10-201.fc20.x86_64) This worked in F19. I'm trying to use cgroups to limit memory usage for some apps that are prone to misbehaviour, and I'm encountering problems. I'm ...
4
votes
0answers
44 views

Does managing cgroups require root access?

I am trying to work with control groups on two different operating systems (Ubuntu and Centos). There are few concerns that I would like to ask. I am trying to create a control group using the ...
4
votes
0answers
100 views

reserve resources for admin console

My servers is often almost DOS'ed by crawlers. I have not yet managed to figure out what exactly is responsible for the high load. CPU, memory and disk IO are not at the limit (could be network ...
3
votes
0answers
246 views

What does hierarchy support do in cgroup?

cgroup has 2 options for memory control: memory.use_hierarchy = 1 : use hierarchy memory.use_hierarchy = 0 : use flat hierarchy, according to this answer What is the difference between the two? I ...
3
votes
0answers
559 views

cpu time measurement with wait4 vs. cpuacct cgroup

I want to start a process and measure the cpu time (user+sys) it needs until it terminates. I know I can use the wait4 system call, which returns a struct with user and system time (I use the sum of ...
2
votes
0answers
96 views

How to calculate blkio shares in cgroups?

Currently I'm trying to setup a test scenario with the use of Debian Wheezy with its default kernel 3.2.60-1+deb7u3 and the cgroups blkio controller. The calculation of blkio.weight is not working for ...
2
votes
0answers
86 views

Cgroups - memory subsystem

I want to set the memory.limit_in_bytes parameter for a control group and disable OOM, so processes freeze when the limit is reached. But i want to change that limit dynamically, if there is more ...
2
votes
0answers
94 views

CGroup Processes Not Terminated even when main process has been killed through Systemctl stop command

I am running systemctl stop process command for some process. Please find the output for systemctl status process below: Loaded: loaded Active: deactivating (stop-sigterm) CGroup: ...
1
vote
0answers
34 views

Linux cgroups: limit CPU usage in absolute values which do not depend on CPU speed

I have a server with a 2.4GHz processor. And there are several cgroups, each one allowed to use 25% of CPU. That's equal to 600MHz. Then I replace the CPU with a faster one, let's say 3.0GHz. If I ...
1
vote
0answers
19 views

cgroup memory.usage_in_bytes always zero for some tasks

I am trying to use cgroup to manage memory on a HPC cluster using torque queue manager on CentOS 6 machines. Just to test I login to a node running a job where I have: ...
1
vote
0answers
15 views

A way to set parameters in the LXC parent cgroups

So I have LXC installed, guest containers configured and all. The LXC containers each go into their own submodule (in cgroup parlance) and each are configured with cpu.shares and also the memory ...
1
vote
0answers
59 views

Limit system processes using cgroups

My server runs several dozens of processes that are not in my control (mostly monitoring software). According to my application logs, sometimes some of the third party processes try to allocate too ...
1
vote
0answers
240 views

receive signal before process is being killed by OOM killer / cgroups

In our cluster, we are restricting our processes resources, e.g. memory (memory.limit_in_bytes). I think, in the end, this is also handled via the OOM killer in the Linux kernel (looks like it by ...
1
vote
0answers
133 views

Cgroups unrecognised service

I'm running the following command, after having modified my version of /etc/cgconfig.conf but get the following error (I'm running Ubuntu 14.04). Does anyone have any idea why this is the case? $ ...
1
vote
0answers
568 views

cgroups, cpuset changing the cpuset of some processes fail

I am trying to "reserve" a core on a CPU for performance measurement. I have mounted a cpuset cgroups vfs. I created two subgroups like this: /cpuset.cpu_exclusive 1 /cpuset.cpus 0-3 ...
0
votes
0answers
20 views

How to mount cgroups controllers using cgconfig.conf, while systemd running

I am trying to create a basic cgroups setup on a few Fedora 20 servers (using cgconfig and cgred services). The problem is I would like to create a hierarchy with access to several ...
0
votes
0answers
15 views

how to set cpuset/cgroup.clone_children flag to 1

I am trying to set the cpuset/cgroup.clone_children to 1 so that whenever I create a cgroup, it should by default copy all values from the parent cgroup. Also I am curious if there is a way to copy ...
0
votes
0answers
71 views

Using Cgroups with Systemd to restrict bash cpu & memory

I want to restrict every user on my Centos 7 server who is logged in via SSH. They should not be able to use, for example, a forkbomb and kill the whole system. The superuser will have no restriction. ...
0
votes
0answers
22 views

Why my limit on CPU does not validate via cgroups

/etc/cgconfig.conf ... group memlimit { memory { memory.limit_in_bytes = 8589934592; } } group cpulimit { cpu { cpu.shares = 1024; } } /etc/cgrules.conf: ...
0
votes
0answers
51 views

LINUX processes are forking up to thousand of processes again, even after kill command

On one of our boxes, I'm encountering strange problem from time to time.. in.tftpd processes are forking up to thousand of processes, getting server to almost unresponsive state. I've tried various ...
0
votes
0answers
79 views

Cgroups usage in Ubuntu and Centos using libcgroup C++ API

I am trying to create a C++ application that limits resources for the current process based on some configuration specified by user using the libcgroup API ...
0
votes
0answers
2k views

Unable to mount cgroup

I've been searching for a solution to this problem but none was working. I would like to start my LXC container but i need to mount cgroup before. [root@stag-devCentOs ~]# lxc-start -n debianLxc ...