Linux cgroups (control groups) allow limiting and accounting for resources on a system, including CPU, memory, and block I/O.
1
vote
0answers
43 views
cgroups: blkio.weight doesn't seem to have the expected effect
I've got 2 LXC containers with these cgroup settings:
lxc.cgroup.blkio.weight = 200
lxc.cgroup.cpu.shares = 200
and
lxc.cgroup.blkio.weight = 800
lxc.cgroup.cpu.shares = 800
I have verified in ...
2
votes
2answers
32 views
Reference documentation for cgroups (control groups) settings
I'm looking for some reference documentation to explain what each of the settings are, for each control group.
For example, there's cpuset.cpus, I think setting this to 0 means use all CPUs, setting ...
1
vote
0answers
80 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
...
5
votes
1answer
146 views
How to solve this memory issue gracefully?
I have a standard Linux (Debian testing) laptop, with a swap partition.
I do a lot of experiments with it. Some of them are really memory hungry and the way Linux behaves by default is an issue for ...
2
votes
0answers
129 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 ...
1
vote
1answer
241 views
controlling priority of applications using cgroups
I would like to understand cgroups better and would like to understand the use-cases for applying cgroups.
Are cgroups a good way for prioritizing different applications (i.e, giving higher priority ...
1
vote
0answers
56 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 ...
1
vote
2answers
175 views
Creating one-time cgroup
I would like to be able to create a one-time temporary group in hierarchy. For example:
#!/bin/sh
run_with_csubgroup /sys/fs/cgroup/group/subgroup/
Which creates group say ...
10
votes
2answers
235 views
What are the effects, if any, of scheduler priorities and policies for threads in an uncontended cpuset?
I have a Linux system where we have used cgroups to create two cpu_exclusive cpusets, A and B, and where we have migrated all user threads and all unbound kernel threads to a cgroup attached to cpuset ...
2
votes
2answers
259 views
Measuring CPU and Memory per user to distribute “cost” of a server
How should I implement approximately correct per-user monitoring on a server? I want a way to split the cost of a server between the users based on their usage. On newer machines (RHEL6) I would use ...
5
votes
1answer
2k views
Using Linux cgroups to balance CPU performance
I have two dual-core Linux systems installed using Linux cgroups with relatively recent kernels; one is running Debian Squeeze, the other Ubuntu 11.04 Natty Narwhal. I've gotten CPU load balancing ...
4
votes
2answers
554 views
Use cgroup to limit the memory usage of virtualbox
I am trying to use cgroup (Control Group) to limit the memory usage of virtualbox, but it does not seem to work.
My machine is:
$ uname -a
Linux fc.bgi 2.6.40-4.fc15.i686 #1 SMP Fri Jul 29 18:54:39 ...
11
votes
2answers
715 views
Weight-based block IO control for VMs
I use KVM to manage my virtual machines. I am trying to limit the resources provided for VMs. I am able to limit the CPU and memory allocated for VMs using libvirt/cgroups. Now I want to control the ...
5
votes
3answers
345 views
How to jail a fastcgi server (or a web-proxied server)?
If you have a web-server (e.g. nginx) often you use a fast-cgi server or another application-http-server for dynamic content. That means in both cases you have a nice process separation between the ...
3
votes
1answer
589 views
How can I configure fair bandwidth sharing between cgroups?
It's fairly easy to use tc with Stochastic Fairness Queueing (SFQ) to configure fair bandwidth sharing between flows, but an application can open multiple flows and get an unfair share of bandwidth. ...
