1

what is the command line argument for running process in multiple cores (linux)

view story
linux-howto

http://stackoverflow.com – 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. Can anyone please help me out understand this or point me in right direction. (HowTos)

dadebian's picture
Submitted by dadebian on 02/01/2013

Stories similar to what is the command line argument for running process in multiple cores (linux)

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).

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?

I have two servers at hand, both with 16 cores. The first is running Debian, the second running Ubuntu.

I have written a small multithreaded java app that creates 16 threads.

Computer CPUs have many cores insde them nowadays.

I have always wondered if there is a way to, when I start a process on the Linux command line, specify which particular core or cores that process might use?

For example, can I start a massive grep task and say "use ALL of CPU2 for yourself".

Or could I start a find task and say "never leave CPU3".

Or maybe I could start a video decoding task

I have a program running on a 32 core system using Intel TBB. The problem I have is when I set the program to use 32 threads, the performance doesn't gain enough compared to 16 threads (only 50% boost). However, when I use:

taskset 0xFFFFFFFF ./foo

which would lock the process to 32 cores, the performance is much better.

I have the two following questions:

Why?

Hi,

Could you please Tell me the command to find the number of cores in red hat box?

I have tried cat cat /proc/cpuinfo | grep processor | wc -l command to find the number of processers.

But need to fond the number of cores.

Is there any difference between core and processor?

Please help on this.

Regards, Vikas.

I have access to a CentOS 6 web server running Apache 2 and MySQL 5 (I can find exact versions if that really makes a difference). This box has dual six core Xeons.

What I find looking over the CPU graphs is that the first two or three cores (0-2) hit 90% usage whilst the other nine are only reaching 30-40% usage.

Hi folks,

I want to know how to run two unix programs on two different cpu cores on a 2-core or 4-core or 8-core CPU machine? Extending this how would i run four and eight unix programs on 4-core and 8-core machine respectively?

If this can be done, how to know which program is assigned to which core?

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?