How much CPU in my AA1?

Dear all,
When I type

Code:

dmesg | grep CPU

I can see next:

Code:

[    0.029600] CPU0: Intel(R) Atom(TM) CPU N270   @ 1.60GHz stepping 02
[    0.000999] Initializing CPU#1
[    0.000999] CPU: L1 I cache: 32K, L1 D cache: 24K
[    0.000999] CPU: L2 cache: 512K
[    0.000999] CPU: Physical Processor ID: 0
[    0.000999] CPU: Processor Core ID: 0
[    0.000999] Intel machine check reporting enabled on CPU#1.
[    0.101038] CPU1: Intel(R) Atom(TM) CPU N270   @ 1.60GHz stepping 02
[    0.101065] checking TSC synchronization [CPU#0 -> CPU#1]: passed.
[    0.102014] Brought up 2 CPUs
[    0.102097] CPU0 attaching sched-domain:
[    0.102119] CPU1 attaching sched-domain:
[    0.666019] Switched to high resolution mode on CPU 0
[    0.666127] Switched to high resolution mode on CPU 1
[    1.185656] ACPI: CPU0 (power states: C1[C1] C2[C2] C3[C3])
[    1.185793] processor ACPI_CPU:00: registered as cooling_device0
[    1.185808] ACPI: Processor [CPU0] (supports 8 throttling states)
[    1.188446] ACPI: CPU1 (power states: C1[C1] C2[C2] C3[C3])
[    1.188563] processor ACPI_CPU:01: registered as cooling_device1
[    1.188578] ACPI: Processor [CPU1] (supports 8 throttling states)

Why it shows 2 CPU?

 

it sjhows 2 cores because of HyperThreading. So unlike most single cores with one thread, the atom has 2 threads.

 

Thank you for the answer.
Will it have increase in performance, when using make -j2 instead of just make for example?

 

I use -j4 if I want to keep the cores busy with the expense of other processes having to wait. j4 lowers my compile times about one third. j2 is quite friendly and no slowdown for other desktop things.

 

OK, I understood. So -j2 will be my choice