Too many CPUs warning

[mpack]

I'm not sure what you think that clears up. I was clear about that already - i.e. I know what an i7 is.

[science_man]

I'm not sure what you think that clears up. I was clear about that already - i.e. I know what an i7 is.

Did you look at those screenshots? Those were really the point of that post.

[mpack]

No, I don't click on obfuscated offsite links. If you want me to see images, attach them locally.

[science_man]

No, I don't click on obfuscated offsite links. If you want me to see images, attach them locally.

sorry, I don't know how.

[mpack]

Notice the "Upload attachment" tab below the main white panel when you compose a reply.

[science_man]

Notice the "Upload attachment" tab below the main white panel when you compose a reply.

Hm, I don't see one of those. Perhaps that's a product of my account not being old and wise enough to handle images responsibly according to oracle.
I don't blame you for not wanting to look at those incredibly sketchy images, but please do. I think it would really clear things up.

[mpack]

No. New users are allowed to upload attachments, it's only URLs they can't post, because that marks you as a spammer.

On the other hand, I hadn't previously noticed that this support discussion is taking place in the Suggestions forum, which doesn't allow attachments (unless you're a mod). Moving you to the "Using VirtualBox" forum.

[science_man]

Thank you! I wasn't sure where to post it, and I guess I chose incorrectly.

Also, sorry for these being so large. Only the left window is really important. And I had to make these low quality to be allowed to upload them.

Here is the screenshot for 4 CPUs for my guest:

4 cores.jpg (105.31 KiB) Viewed 7346 times

Here is the screenshot for an 8 CPU guest:

8 cores.jpg (111.55 KiB) Viewed 7346 times

[mpack]

Sorry, I'm still not sure what the images are supposed to tell me. I see a typical graphic for quad core processor. It even says "4 cores" both times.

[science_man]

Sorry, I'm still not sure what the images are supposed to tell me. I see a typical graphic for quad core processor. It even says "4 cores" both times.

It shows that a guest with 8 cpus uses all 8 logical processors, whereas a guest with 4 cpus (the number of actual cores in my computer) only uses half my logical processors, and only one hyperthread in each physical core.

[mpack]

I see. I think you'll need to ask the devs about this one. No doubt it will have some subtle explanation.

[science_man]

I see. I think you'll need to ask the devs about this one. No doubt it will have some subtle explanation.

Thanks. My first thought as to an explanation would be that my guest "sends" as many processes as it has CPUs to the host, and my host then assigns each process to a virtual CPU, but that doesn't seem like how it should work. If my guest has actuall access to the inner workings of the CPU, it should be allowed to figure out how to hyperthread itself.

[giacomo]

I get the same warning.

HOST:
VirtualBox 5.0.10 r 104061
Windows 7 Professional 64-bit
i7-4790K

[loukingjr]

I get the same warning.

So does anyone else who assigns more virtual cpus to a guest than the host cpu has.

[giacomo]

You are not listening to what people are saying.

If I run Ubuntu directly on my processor (i7-4790K), lscpu would give
CPU(s): 4
Thread(s) per core: 2

1. How do you set up an Ubuntu Guest in VirtualBox so that it has this configuration?

2. In any case, I ran Ubuntu as Guest with 8 cores, despite the warning in VirtualBox that I can't use more than 4.
lscpu capture shows 8 cores on the guest.
htop shows 8 cpus
Explanation?

settings.JPG

lscpu.JPG

htop.JPG