Elevated permissions needed?

[munichmule]

Hi Mike,

Thank you for the awesome library!
In my test, sudo can read stats just fine, but I'm getting null from LinuxTaskStatsReader.GetByThread when running without elevated permissions.

Code:

var tid = LinuxTaskStatsReader.GetTid();
Console.WriteLine("Tid = " + tid);
Console.WriteLine("IsGetTaskStatByThreadSupported = " + LinuxTaskStatsReader.IsGetTaskStatByThreadSupported);
Console.WriteLine("Stats = " + LinuxTaskStatsReader.GetByThread(tid));

Output:

~/dev/sandbox/Sandbox$ dotnet run
Tid = 726
IsGetTaskStatByThreadSupported = True
Stats = null

All I need is to get CPU time by thread, similar to what you other package CpuUsage does via libc getrusage. But I had to switch to NativeLinux.Interop because I want to read thead's CPU from another thread, so I need a function which accepts thread id/handle, not the one which only runs on the current thread.

Is there a more simple solution for my case maybe, which doesn't require elevated permissions? I'm not good at linux api unfortunately...

PS: I tested it on Ubuntu 22.04.1 LTS on WSL, but it doesn't seem to be version-specific.

Thanks!

[devizer]

I can help instead of Mike 🙂

You can access CPU usage of the current thread and sub-task tree threads only. Additional permissions are required if we need access to a process created by another user.

Regarding WSL CpuUsage is fully supported on WSL v1 and v2.
But I didn't test taskstats on WSL.

[munichmule]

I can help instead of Mike

Oh, sorry, I clicked wrong profile :)