Different between core & socket

[JohnsVCP5]

Dear Friends,

In my environment configured more vCpu like 32,16,12,8,4 core

please tell me socket the above mentioned core for best practices for core vs socket

Regards,

Johnson.s

[admin]

Does this help your query.

http://frankdenneman.nl/2013/09/18/vcpu-configuration-performance-impact-between-virtual-sockets-and-virtual-cores/#comment-20293

vCPU configuration. Performance impact between virtual sockets and virtual cores? - frankdenneman.nl

if you found my answer to be useful, feel free to mark it as Helpful or Correct.

[hussainbte]

The key thing as per frank's article is

Well there is a difference and it has to do with the Hot-Add CPU feature. When enabling the option CPU Hot Plug you can only increase the virtual socket count.

Also I have read that vmware recommends using 1 core per socket until and unless there is specific requirement from the guest

[TomHowarth]

futher to all that has already been mentioned,  using socket count rather than CPU can reduce  license count.

[NagangoudaPatil]

Socket mean physical CPU, each physical CPU have core (8,16,32,64), core is the logical CPU within physical CPU.

[NagangoudaPatil]

License will be applicable for number of socket (Physical CPU).

[JohnsVCP5]

The below mentioned vCpu configuration is recommendable ? 

Please advice

vCPUs	Sockets	Cores p/s		vCPUs	Sockets	Cores p/s
6	6	1		6	6	1
6	6	1		6	6	1
8	8	1		8	8	1
8	8	1		8	4	2
8	8	1		8	4	2
8	8	1		6	6	1
8	8	1		6	6	1
8	8	1		8	4	2
8	8	1		8	4	2
8	8	1		6	6	1
8	8	1		6	6	1
8	8	1		8	4	2
8	8	1		8	1	8
16	8	2		8	8	1
8	8	1		16	8	2
8	8	1		8	4	2
8	8	1		6	6	1
				6	6	1
				16	2	8
				8	8	1
				8	4	2
				8	8	1
				8	4	2
				8	4	2
				8	8	1
				8	8	1
				12	4	3

[JohnsVCP5]

The below mentioned vCpu configuration is recommendable ?

Please advice

vCPUs	Sockets	Cores p/s		vCPUs	Sockets	Cores p/s
6	6	1		6	6	1
6	6	1		6	6	1
8	8	1		8	8	1
8	8	1		8	4	2
8	8	1		8	4	2
8	8	1		6	6	1
8	8	1		6	6	1
8	8	1		8	4	2
8	8	1		8	4	2
8	8	1		6	6	1
8	8	1		6	6	1
8	8	1		8	4	2
8	8	1		8	1	8
16	8	2		8	8	1
8	8	1		16	8	2
8	8	1		8	4	2
8	8	1		6	6	1
				6	6	1
				16	2	8
				8	8	1
				8	4	2
				8	8	1
				8	4	2
				8	4	2
				8	8	1
				8	8	1
				12	4	3

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[hussainbte]

there are instances where you have allocated 2 cores per socket and even 3 cores per socket.

If that is not a specific guest OS requirement, I suggest you change it to 1 core per socket and increase the number of virtual sockets

examples:

16

8

2

12

4

3

[rks238]

I think lot is already explained in details but still I can give you little more statics.

The socket is physical connection of processor on motherboard, core is virtual processor on each socket

1 socket with 1 core = 1vCPU

1 socket with 2 core= 2vCPU

and so on ....

NOw

2 socket with 1 core= 2vCPU

2 socket with 2 core= 4vCPU

and so on ..

Now if your processor has Hype rthreading and is enabled then all vCPU above will be multiplied by 2

1 socket with 1 core (hyper threading enabled)= 2vCPU

1 socket with 2 core (hyper threading enabled)= 4vCPU

and so on ....

NOw

2 socket with 1 core (hyper threading enabled)= 4vCPU

2 socket with 2 core(hyper threading enabled)= 8vCPU

and so on ..

You may not find a single socket single core processor with hyper threading feature but just take above statics for explaining purpose.