chrt -r 20

[mgl]

On my VDS, when I run "chrt -r 20" with my start command I get the following output:

sched_setscheduler: Operation not permitted
failed to set pid 0's policy

I was told that this sounds as though I may be running the command as a non-root user. This is true and running the command as root does allow the server to boot however, I'd prefer not to run the server as a root user because it presents a potential security issue. Any help on how to to get this to work as a non-root user would be appreciated.

[Edge100x]

One way to approach this would be to simply use chrt to execute sudo -- something like this:

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chrt -f 50 sudo -u hlds ./srcds_run -game cstrike

Another would be to set up a cronjob as root that chrt's all processes with a certain name or user to the right value at some regular interval.

[mgl]

Thanks for the suggestions.

1. I'm not too clear on the difference between the fifo and rr schedulers though. Why did you put "chrt -f 50" in your example as opposed to "chrt -r 20" like you have in this post?

2. I usually run my servers using screen like so:
screen -A -m -d -S sessionname ./hlds_run -game cstrike

How would I go about using your first suggestion while also running the server via a screen session?

[Edge100x]

1. I'm not too clear on the difference between the fifo and rr schedulers though. Why did you put "chrt -f 50" in your example as opposed to "chrt -r 20" like you have in this post?

You can use either one for your game server -- they have the same performance for this application in my testing (the key is the fact that it puts the server into a realtime class, which changes the way timer slack is handled). If chrt -r has been working well for you, I'd say stick with it.

2. I usually run my servers using screen like so:
screen -A -m -d -S sessionname ./hlds_run -game cstrike

How would I go about using your first suggestion while also running the server via a screen session?

I'd recommend putting screen on the outside so that part runs as root and doesn't get realtime priority:

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screen -AmdS sessionname chrt -f 50 sudo -u hlds ./srcds_run -game cstrike