Difference between revisions of "User:Unikum/Ulatencyd"

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m (Alad moved page Ulatencyd to User:Unikum/Ulatencyd without leaving a redirect: Project deprecated in Arch, move to original author page)
 
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[[Category:Kernel]]
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{{Out of date|Broken with recent Arch versions, no plans to fix it}}
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Ulatency is a daemon that controls how the Linux kernel will spend it's
 
Ulatency is a daemon that controls how the Linux kernel will spend it's
 
resources on the running processes. It uses dynamic cgroups to give the kernel
 
resources on the running processes. It uses dynamic cgroups to give the kernel
Line 6: Line 7:
 
It strongly supports the lua scripting language for writing rules and the
 
It strongly supports the lua scripting language for writing rules and the
 
scheduler code.
 
scheduler code.
 +
 +
{{warning|With systemd 21x Ulatencyd cannot be successfully run on Arch Linux. The problem has been further described in the AUR [https://aur.archlinux.org/packages/ulatencyd-git/ comments].}}
  
 
== Installation ==
 
== Installation ==
Line 26: Line 29:
  
 
You may wish to get the latest fixes and rules from Git with {{AUR|ulatencyd-git}}.
 
You may wish to get the latest fixes and rules from Git with {{AUR|ulatencyd-git}}.
 
There are some important fixes that haven't yet been merged for kernels > 3.2.0, for blkio weight:
 
{{bc|# curl https://raw.github.com/poelzi/ulatencyd/157bb03ee39024f49416c12ae727b171f2011233/conf/scheduler/20-desktop.lua > /etc/ulatencyd/scheduler/20-desktop.lua
 
# curl https://raw.github.com/poelzi/ulatencyd/157bb03ee39024f49416c12ae727b171f2011233/conf/scheduler/30-game.lua > /etc/ulatencyd/scheduler/30-game.lua
 
# curl https://raw.github.com/poelzi/ulatencyd/157bb03ee39024f49416c12ae727b171f2011233/conf/scheduler/30-single-task.lua > /etc/ulatencyd/scheduler/30-single-task.lua}}
 
  
 
To start ulatencyd:
 
To start ulatencyd:
{{bc|# /etc/rc.d/ulatencyd start}}
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{{bc|# systemctl start ulatencyd.service}}
  
If you want ulatencyd start on boot add ulatencyd in DAEMONS section in /etc/rc.conf.
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If you want ulatencyd start on boot, enable the service file as follows:
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{{bc|# systemctl enable ulatencyd.service}}
  
 
To verify that it works:
 
To verify that it works:

Latest revision as of 10:45, 7 December 2014

Tango-view-refresh-red.pngThis article or section is out of date.Tango-view-refresh-red.png

Reason: Broken with recent Arch versions, no plans to fix it (Discuss in User talk:Unikum/Ulatencyd#)

Ulatency is a daemon that controls how the Linux kernel will spend it's resources on the running processes. It uses dynamic cgroups to give the kernel hints and limitations on processes.

It strongly supports the lua scripting language for writing rules and the scheduler code.

Warning: With systemd 21x Ulatencyd cannot be successfully run on Arch Linux. The problem has been further described in the AUR comments.

Installation

Kernel options requires:

PROC_EVENTS=y
CONFIG_CGROUPS=y
CONFIG_CGROUP_FREEZER=y
CONFIG_CGROUP_DEVICE=y
CONFIG_CGROUP_MEM_RES_CTLR=y
CONFIG_CGROUP_MEM_RES_CTLR_SWAP=y
CONFIG_CGROUP_MEM_RES_CTLR_SWAP_ENABLED=y
CONFIG_CGROUP_SCHED=y
CONFIG_FAIR_GROUP_SCHED=y
CONFIG_RT_GROUP_SCHED=y
CONFIG_BLK_CGROUP=y
CONFIG_CFQ_GROUP_IOSCHED=y

Install ulatencydAUR from the AUR or the ArchAudio/testing repository.

You may wish to get the latest fixes and rules from Git with ulatencyd-gitAUR.

To start ulatencyd:

# systemctl start ulatencyd.service

If you want ulatencyd start on boot, enable the service file as follows:

# systemctl enable ulatencyd.service

To verify that it works:

$  ulatency tree
 /sys/fs/cgroup/cpu
 └─┬»cpu«
   ├ 2 kthreadd
   ├─┬»s_ul«
   │ └ 4975 ulatencyd
   ├─┬»sys_bg«
   │ └ 1928 cron
   ├─┬»sys_idle«
   │ └ 3036 preload
   ...

Configuration

Some settings are adjustable in /etc/ulatencyd/ulatencyd.conf and the cgroups that will be used can be changed in /etc/ulatencyd/cgroups.conf

Ulatencyd by default changes the io scheduler for all devices to cfq, to disable this behavior (for if you configure your schedulers yourself), simply edit /etc/ulatencyd/rules/io.lua and comment out the lines:

   if self.first_run == true then
     self:set_scheduler(dev, ulatency.get_config("io", "scheduler") or "cfq")
   end

See also