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cpuinfo to decide processor affinity

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http://stackoverflow.com – I've tried to decide processor affinity rule for my applications according to /proc/cpuinfo , My redhat Linux showes processor : 0 to 47 , means server has 48 processor unit physical id : 0 to 3 , means server has 4 cpu sockets cpu cores : 6 , means each socket has 6 cores siblings : 12 , means each core has 2 hyperthreads So totally , this server has 4 * 6 * 2 = 48 processor units , am I correct so far ? What I like to do is to use sched_setaffinity function , first I like to know is the hyperthreads in the same core , for example ... processor 0 : physica (HowTos)

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Submitted by fooubuntu on 01/09/2013

Stories similar to cpuinfo to decide processor affinity

I have done a sched_setaffinity test in Linux in a server with 1 socket ,4 cores , the following /proc/cpuinfo showes the cpu information :

processor : 0 model name : Intel(R) Core(TM)2 Quad CPU Q8400 @ 2.66GHz cache size : 2048 KB physical id : 0 siblings : 4 cpu cores : 4

processor : 1 model name : Intel(R) Core(TM)2 Quad CPU Q8400 @ 2.66GH

For some reason /proc/cpuinfo is only displaying one core from a 16 core processor. However hwinfo --cpu shows the 16 cores. I have ACPI enable in the bios and I have cleared the noacpi tags out of the grub.cfg file.

Wrong Processor Info 35 weeks 3 days ago

I'm using Intel i5-2430M processor which is a dual core processor, but the output of /proc/cpuinfo shows four cores. Why? Is is because of hyper-threading?

If yes, is there any way I can see the actual number of cores?

Also, how can I see the sizes of L1 and L2 caches?

Output of /proc/cpuinfo: http://pastebin.ubuntu.com/1206427/

My box is using intel i7 with hyperthreading enabled. So it has 8 logical processors. I am confused about their numbering.

I checked the /proc/cpuinfo file, the processor id, core id, and siblings do not AT ALL give any information about the REAL topology of the processors (e.g., the processor ids range from 0 to 7, and all the core ids are 0).

Can anybody explain this to me?

I have a linux server that apparently has two Intel Xeon X5670.

/proc/cpuinfo shows 12 CPUs but dmidecode shows only one CPU and the other one is in the Unpopulated status like it is showing that this is other CPU is because of the hyper threading.

My server is a HP Proliant DL380 G7 and it can have up to two CPUs.

My question is if my server has one or two physical CPUs or if there is a settin

I was looking around on Wikipedia, and ran across the UltraSPARC T2 processor. This is a processor with 8 cores (8 physical processors) and 8 threads per core (64 logical processors!)

I'm aware of Intel's Hyper-Threading and other technologies, and I know collisions between the threads have the possibility of decreasing the processor's throughput.

I have intel celeron d 3.06ghz processor . Now I am using 32 bit Ubuntu and I wish to upgrade to 64 bit Ubuntu if my processor allow. My doubt is how to identify 64 bit processor with cat /proc/cpuinfo command. it shows

clflush size : 64

Does my processor support 64 bit OS ?

Hello gurus of serverfault. I'm asking you about help to decide which configuration of CPU I need to deploy client's project on his future dedicated server. First of all some words about project: it would be Ruby on Rails project. I've made some checks on my local laptop, while was clicking hard on this projects site. My environment, 2Gb memory, Intel Core 2 Duo T5500 @1.66Ghz.

No of CPU's and No of Core 16 weeks 5 days ago

I would like to understand how many number of CPUs and cores do I have on my server based on following out put..

Quote:

[root@xyz ~]# cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 26 model name : Intel(R) Xeon(R) CPU X5570 @ 2.93GHz stepping : 5 cpu MHz : 1596.000 cache size : 8192 KB physical id : 0 siblings : 8 core id : 0 cpu core