Oracle X4 series, Administration Manual

Page: 209 / 240

Calculate Socket and Core Numbers
Note -
The Intel Xeon E7-8895v2 processor has a core frequency of 2.8 GHz, but has a
maximum frequency of 3.2 to 3.6 GHz. Changing the number of active cores changes the
maximum frequency, not the core frequency.
Number of Active Cores Maximum Frequency (GHz)
1 to 2 3.6
3 to 6 3.5
7 to 10 3.4
11 to 15 3.2
Calculate Socket and Core Numbers
To activate or deactivate a core using operating system commands, you must know the number
or numbers of the virtual or logical processors associated with that core. This task provides
instructions for calculating those numbers.
■
Your server has two, four, or eight sockets numbered 0 through 1, 3, or 7.
■
Each socket has 15 cores numbered 0 through 14.
■
Each core has one or two virtual processors associated with it, depending on whether
hyperthreading is enabled or not. To deactivate a core, you must deactivate both virtual
processors associated with that core.
You can also use operating system commands to display virtual processor numbers. See:
■
“Configure Elastic Computing (Oracle Solaris Operating System)” on page 211
■
“Configure Elastic Computing (Oracle Linux Operating System)” on page 212
1. Calculate the number of the first virtual processor.
a. Multiply the socket number by 15.
b. Add the core number to the socket number.
For example, to calculate the number of the first virtual processor for core 2 on socket 2:
2 x 15 +2 = 32
Note -
If hyperthreading is disabled, this is the only number you need to activate or deactivate
the core.
Configure Elastic Computing 209