Github user revans2 commented on a diff in the pull request:
https://github.com/apache/storm/pull/1054#discussion_r51136522
--- Diff: documentation/cgroups_in_storm.md ---
@@ -0,0 +1,61 @@
+# CGroups in Storm
+
+CGroups are used by Storm to limit the resource usage of workers to
guaratee fairness and QOS.
+
+**Please note: CGroups is currently supported only on Linux platforms**
+
+## Setup
+
+To use CGroups make sure to to install cgroups and configure cgroups
correctly. For more information about seting up and configuring, please visit:
+
+https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Resource_Management_Guide/ch-Using_Control_Groups.html
+
+A sample/default cgconfig.conf file is supplied in the <stormroot>/conf
directory. The contents are as follows:
+
+```
+mount {
+ cpuset = /cgroup/cpuset;
+ cpu = /cgroup/storm_resources;
+ cpuacct = /cgroup/cpuacct;
+ memory = /cgroup/storm_resources;
+ devices = /cgroup/devices;
+ freezer = /cgroup/freezer;
+ net_cls = /cgroup/net_cls;
+ blkio = /cgroup/blkio;
+}
+
+group storm {
+ perm {
+ task {
+ uid = 500;
+ gid = 500;
+ }
+ admin {
+ uid = 500;
+ gid = 500;
+ }
+ }
+ cpu {
+ }
+}
+```
+
+# Settings Related To CGroups in Storm
+
+| Setting | Function
|
+|-------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| cgroup.enable | This config is used to set whether or
not cgroups will be used. Set "true" to enable use of cgroups. Set "false" to
not use cgroups. When this config is set to false, unit tests related to
cgroups will skipped. Default set to "false"
|
+| cgroup.storm.hierarchy.dir | The path to the cgroup hierarchy that
storm will use. Default set to "/cgroup/storm_resources"
|
+| cgroup.storm.resources | A list of subsystems that will be
regulated by CGroups. Default set to cpu and memory
|
--- End diff --
What other subsystems are valid? If there are no other ones that are
valid, simply indicate that.
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