Linux "PSI" Patches Report Stall/Pressure Information For CPU / Memory / Storage

[phoronix]

Phoronix: Linux "PSI" Patches Report Stall/Pressure Information For CPU / Memory / Storage

One of the interesting patch series in the works is the "PSI" work by Johannes Weiner of Facebook...

http://www.phoronix.com/scan.php?page=news_item&px=Linux-PSI-Patches-Interest

[Tomin]

Why are you showing me this cruel picture of a poor slaughtered memory module?!

Please don't take me too seriously.

[fld-]

I usually start encountering pressure-stall related issues on my desktop after ~10 days of uptime. Will be interesting to see if/how the PSI information will reflect such situations. If it's good, I hope it gets added to glances

[lucasbekker]

Could somebody tell me if this could be used to find performance bottlenecks in applications?

[esmth]

Could somebody tell me if this could be used to find performance bottlenecks in applications?

I was wondering this as well. Right now I can't quickly tell if my program is memory or CPU bound as both the conditions just show as CPU utilization. I need to use perf to find this information out.

[reavertm]

Gprof/callgrind is not enough?

[RussianNeuroMancer]

This thread kind of related.

Any advice, people?

[Guest]

I usually start encountering pressure-stall related issues on my desktop after ~10 days of uptime. Will be interesting to see if/how the PSI information will reflect such situations. If it's good, I hope it gets added to glances

If you're using Gnome then it's not kernel related.

[waxhead]

These days when systemd (there I said it) is used on most systems and therefore everything that runs is neatly packed into cgroups. How would this PSI system be different, or actually more beneficial than monitoring the system via systemd-cgtop ?!

[starshipeleven]

Could somebody tell me if this could be used to find performance bottlenecks in applications?

No it does not. It provides a percentage of "usage" for CPU, memory and IO.