How to change priority of specific thread (LWT) in Linux?

Question

It's possible to see priorities and scheduling policies of all threads of a process like that:

ps H -o 'tid pri cls comm' PID

How to change the individual thread priorities from the command line?

The commands like renice and chrt seem to affect the whole process, but I'm searching the critical path among the threads. Is there maybe anything useful in /proc?

score 1 · Accepted Answer · answered Apr 13 '18 at 11:51

1

You can use chrt

Example:

sudo chrt -r -p 40 1502

where 40 is the priority and 1502 is the TID

second column from ps -eLo pid,tid,rtprio,ni,comm output

answered Apr 13 '18 at 11:51

sotiris

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I'm pretty sure that I dug into the sources of `chrt`, and it doesn't do that. – Velkan Apr 13 '18 at 11:58
@Velkan - It doesn't do what? – Armali Jul 08 '20 at 06:55
@Armali, it doesn't change priority of specific thread. It changes the priority of the process. – Velkan Jul 11 '20 at 18:03
@Velkan - The proof of the pudding is in the eating. When I try, it changes the priority of the specified TID. – Armali Jul 14 '20 at 07:04
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@Armali, apparently changes to the kernel have unified TIDs and PIDs a bit more during these years so now it's working. – Velkan Jul 14 '20 at 07:44

How to change priority of specific thread (LWT) in Linux?

1 Answers1