Difference between two linux machines

Question

I have two machines and I am trying to see which one is more powerful machines. I can check memory and cpu but not sure how to understand other things from lscpu:

Here is machineA "lscpu" result:

david@machineA:~$ lscpu
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                40
On-line CPU(s) list:   0-39
Thread(s) per core:    1
Core(s) per socket:    1
Socket(s):             40
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 62
Stepping:              4
CPU MHz:               2499.998
BogoMIPS:              4999.99
Virtualization:        VT-x
Hypervisor vendor:     KVM
Virtualization type:   full
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              25600K
NUMA node0 CPU(s):     0-39

Now here is machineB "lscpu" result:

david@machineB:~$ lscpu
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                32
On-line CPU(s) list:   0-31
Thread(s) per core:    2
Core(s) per socket:    8
Socket(s):             2
NUMA node(s):          2
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 45
Stepping:              7
CPU MHz:               2599.865
BogoMIPS:              5199.95
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              20480K
NUMA node0 CPU(s):     0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30
NUMA node1 CPU(s):     1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31

What is the main difference between these two machines? Basically I want to see which one is more powerful and also compare them with Disk Capacity/RAM like which machines has more disk capacity and RAM as well.

Answer 1

What you're asking is the same kind of question as "Which is the better car? A Lotus Elise or a Corvette?

Well, that depends entirely on your personal use-case! The Elise is a noisy, seemingly uncomfortable car with a small 1.8L engine that only does 127mph, whereas the Corvette is a less noisy car, comfortable, with a 6.2L engine that does 199mph.

In the case of your CPUs: the first one one is an 8-core, 2.6 GHZ, ECC memory with 25MB L3 cache and 59.7 GB/s bus speed whereas the second one which is a 6-core, 3.3GHZ, 20MB L3 Cache, 51.2GB/s bus speed processor.

So if you run very little multi-threaded applications and want individual applications to run at their maximum speed, take CPU2 (highest individual speed), but if you need massive multi-threaded computing speed, take CPU1 (more total speed).

Edit: Now that you've provided the use-case: CPU#1 would IMHO provide a slightly better increase (14%-19% estimated maximum) if your application is running on that machine on the pure bare metal and your application doesn't use any disk access once it's running. Otherwise, the performance increase will be limited by your disk speed increase (not provided) and you should revise the speed increase downwards.

_{I would buy the Lotus in a jiffy as it's much more fun!}

Answer 2

On machine A you're running inside a KVM VM, so you'll only see what the VM was configured with. The underlying CPU is a Xeon E5-2650v2 with a base frequency of 2.6GHz (family 6, model 62).

On machine B you're running on the bare metal. The CPU is a Core i7-3960X with a base frequency of 3.3GHz (family 6, model 45).

You can compare the CPU characteristics on Intel's web site, but it's difficult to establish which is better without knowing your workload: the i7 is older, but has a higher base frequency, whereas the E5 has more efficient cores and more of them.

(lscpu shows you the CPU speed at the time you run it, which doesn't say much about the actual capabilities of the processor.)

As far as memory and disk is concerned, you need to run free and df -h (and perhaps lsscsi if it's installed) to determine that information.