[Vm-dev] pthread_setschedparam failed: Not owner
Eliot Miranda
eliot.miranda at gmail.com
Wed Apr 1 17:07:49 UTC 2020
Hi Stes,
I answered this at length here earlier today. Just forwarded the message to you.
_,,,^..^,,,_ (phone)
> On Apr 1, 2020, at 9:59 AM, stes <stes at telenet.be> wrote:
>
>
>
> | proc sem |
> proc := [| n |
> n := 0.
> [(n := n + 1) even ifTrue:
> [n := n - 1]] repeat] newProcess.
> sem := Semaphore new.
> [(Delay forSeconds: 1) wait.
> proc terminate.
> sem signal] forkAt: Processor userInterruptPriority.
> proc resume.
> sem wait
>
> If I select the above and choose "print it" it prints:
>
> a Semaphore()
>
>
> If put [] around it and print it , it prints 1002
>
> I'm sorry this is a beginner's question but I don't quite see what the
> result of the program should be,
> and whether the answer is correct.
>
> I ran the above code in the RT (real time) class
>
> bash-4.4$ priocntl -d $$
> REAL TIME PROCESSES:
> PID[/LWP] RTPRI TQNTM TQSIG
> 16991 0 1000 0
>
> If I run the same code in the Timeshare (TS) or IA (interactive) class the
> results are the same:
>
> it prints 1002 if I put [] around it and print it, and it prints "a
> Semaphore()" after about 1 second if I just print the code
>
> Note that in the IA case (which is the default) the vm prints:
> pthread_setschedparam failed: Not owner
> This VM uses a separate heartbeat thread to update its internal clock
> and handle events. For best operation, this thread should run at a
> higher priority, however the VM was unable to change the priority. The
> effect is that heavily loaded systems may experience some latency
> issues. If this occurs, please create the appropriate configuration
> file in /etc/security/limits.d/ as shown below:
>
> cat <<END | sudo tee /etc/security/limits.d/squeak.conf
> * hard rtprio 2
> * soft rtprio 2
> END
>
> and report to the squeak mailing list whether this improves behaviour.
>
> You will need to log out and log back in for the limits to take effect.
> For more information please see
> https://github.com/OpenSmalltalk/opensmalltalk-vm/releases/tag/r3732#linux
>
>
>
> If I put the vm in the RT class then it doesn't print this warning or error
> message.
>
> But the behavior of the "test code" in Squeak seems to me the same ...
>
>
>
>
>
>
> --
> Sent from: http://forum.world.st/Squeak-VM-f104410.html
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