Admin center doesn't recognize all cores.

Hi I have a 8core cpu.when I try to use it in my cluster, admin center recognize just 4 cores however I disabled parked property of cores in Windows. thanks in advance

[Jan]

Is it a 8-core CPU or a 4-core with hyper-threading?

[Aseman]

1.How can I check which it is?

2.Will 4-core with hyper-threading has performance same as 8-core if I define 8 workers in it.

Thanks

Answer 1

[Jason Ross]

Question 1:

How to find if you have hyperthreading:

Google the processor spec, and you'll likely be taken to a vendor page (Intel or AMD), or perhaps Wikipedia. The spec should tell you.

If you don't want to go that route, change the setting in the BIOS to enable or disable hyperthreading and compare the number of processors before and after. This will require a reboot.

Question 2:

It's very difficult to predict performance without actually trying it. In many cases for big computing loads, I've personally found that the number of "real" cores is what matters. For some computing, the hyper-threading can help -- but only you can know if it will help with your particular problem.

Keep in mind that the number of workers started is a default. You may find that you get better performance with less than the default just as you might find better performance with more. It's entirely possible that your problem could be bound by memory, disk performance or network performance and not just CPU performance.

[Aseman]

Thanks you so much but what about my base question : why does admin center show 4 cores? does it depend on hyper-threading property?

[Jason Ross]

Yes

[Aseman]

Ok,how can I define 8 workers that use hyper-threading when it shows 4 cores?

[Jason Ross]

Under the Parallel menu in MATLAB, select Manage Configurations. Select the configuration and change the number of workers to 8.

[Aseman]

Excuse me for my questions.I use a cluster and if I define 8 workers on this host in admin center will it work?

Thanks

[Jason Ross]

Assuming you are licensed for 8 workers, it should start 8 workers on this host. Keep in mind, though, that there is a distinct possibility that over-subscribing the number of cores will not improve performance -- and it may actually decrease performance. I'd highly recommend running an example problem with 4 workers and 8 workers to see where you get the best performance.