3

[all variants] Does Ubuntu actually use multiple Cores for anything?

view full story
linux-howto

http://ubuntuforums.org – Well I don't get why you would get a Multi-core processor if it doesn't. If I was using Just Ubuntu would multiple cores really matter as any CPU intensive things (Gaming as an example) that would use multiple cores are non-existent on Ubuntu. I'm also talking about the Physical Limitations of Linux as a whole. Are there any Programs that use multiple cores? (Hardware)

colm's picture
Submitted by colm on 10/31/2009 – Made popular on 10/31/2009

Stories similar to [all variants] Does Ubuntu actually use multiple Cores for anything?

I am trying to run my program in more than one core. I have 12 cores in my desktop and want the computer to use 1,2,3,4,......,11,12 one by one and want to test how the program performs in different number of cores. I tried using -t4 or -t 4 after the executable like.

./a.out -t4

but I cannot make sure whether its using exactly 4 or not.

I have a 6 core processor and have noticed some performance issues. I recognize coming from Windows things won't be the same. But I've heard that it's not incredibly uncommon for linux to not utilize all cores available. Is there a command or series of commands to be sure linux recognizes my processor runs all 6 cores?

We have a system with 4 Xeon Processors each with 10 cores, total 512 GB RAM and 10 TB Hard Drive.

we want to create multiple user accounts with different resource limitations as :

User 1: RAM : 50GB, PROCESSOR: 10 Cores , User folder in home directory of 10GB space.

User 2: RAM : 100GB, PROCESSOR: 30 Cores , User folder in home directory of 100GB space.

Core parking is a new feature that introduced in Windows 7 to get better Battery performance .

Depending on the resource use of the operating system it may park one or multiple cores of a multi-core cpu to reduce the computer’s power consumption and thermal emissions.

I have SQL Server 2008 Express running on Hyper-V based virtual machine with two vCPU-s. I've just been reading up on SQL Server 2012 Express and noticed that it's CPU is "Limited to lesser of 1 Socket or 4 cores" (http://msdn.microsoft.com/en-us/library/cc645993(v=SQL.110).aspx)

My question is how do the SQL Server 2012 limits on CPUs/Cores translate into vCPU-s?

I have a Dell server with two cpus, each cpu has 6 cores, and each core is hyperthreaded (i.e. should be equivalent to two virtual cores).

Quad-core phones? Old news. All the manufacturers are doing that now. How about a 48-core CPU for smartphones and tablets? Intel’s looking to shake up the mobile market and make that kind of processing power a reality within the next ten years.

I have Ubuntu installed as VM on my laptop. My laptop has quad core with HT technology making it 8 cores.

Within Ubuntu VM I can only use max of 4 cores.

What should I do so I can access all 8?

Which Linux distribution would let me use all my cores? Which VM software should I use?

Any advices?

I am a new person here but I want to make an ssh server in Lubuntu on a pretty old computer.

I know that you can log in multiple ssh clients onto one ssh server computer. However, if you are running tasks logged in physically as a user ("George") on the server, then how will it affect the remote clients' logins to the server?