interesting cpu usage in Linux.

[Ashleyyyy]

so i moved to Linux, and i noticed something interesting.. 

i have a dual Xeon system, rest of the specs in signature. 

 

in Windows i noticed that most things run on one or 2 core's, and multi threaded things run on one of the 2 cpu's. like playing Overwatch a few core's on cpu 1 would be at nearly 100%, and cpu 2 would be at 1 or 2% usage... 

 

in Linux, while watching youtube for example in chrome all 24 threads show activity, all of them under 20%, most under 5%... so does Linux not care what programs use what cpu, and does it just spread the load? 

[Mira Yurizaki]

Considering you have a multi-processor system, it's also likely a NUMA enabled one. That is, the system RAM between the two processors is combined into a single pool. However, when an application on one processor accesses data on another processor's system RAM, there's a latency penalty.

 

I'm guessing Windows will not run NUMA unaware apps on both processors because apps that are not NUMA aware could have issues. I'm not sure what Linux does with NUMA based systems and app scheduling though.

[Snipergod87]

My load's really spread out in Windows, it prefer's putting tasks on non hyperthreaded "cores"

[Ashleyyyy]

9 hours ago, M.Yurizaki said:

Considering you have a multi-processor system, it's also likely a NUMA enabled one. That is, the system RAM between the two processors is combined into a single pool. However, when an application on one processor accesses data on another processor's system RAM, there's a latency penalty.

i haven't noticed a latency yet... but i think it does use NUMA, because each cpu has 6 ram slots, and the user guide tells you to put 3 sticks for one cpu and 3 sticks for the other one if you only have 6, which i do... 

[Ashleyyyy]

9 hours ago, Snipergod87 said:

My load's really spread out in Windows, it prefer's putting tasks on non hyperthreaded "cores"

do you have a dual-cpu system though?