请问这个几个CPU，并行的时候可用几个

songduanlei

[root@nkc2c sdl]# dmesg |grep CPU
Initializing CPU#0
CPU 0 irqstacks, hard=c03ea000 soft=c03ca000
CPU: After generic identify, caps: bfebfbff 00000000 00000000 00000000
CPU: After vendor identify, caps:  bfebfbff 00000000 00000000 00000000
CPU: Trace cache: 12K uops, L1 D cache: 8K
CPU: L2 cache: 512K
CPU0: Initial APIC ID: 0, Physical Processor ID: 0
CPU: After all inits, caps:        bfebf3ff 00000000 00000000 00000080
Intel machine check reporting enabled on CPU#0.
CPU0: Intel P4/Xeon Extended MCE MSRs (12) available
CPU0: Thermal monitoring enabled
CPU0: Intel(R) Xeon(TM) CPU 2.40GHz stepping 05
per-CPU timeslice cutoff: 1463.08 usecs.
CPU 1 irqstacks, hard=c03eb000 soft=c03cb000
Initializing CPU#1
CPU: After generic identify, caps: bfebfbff 00000000 00000000 00000000
CPU: After vendor identify, caps:  bfebfbff 00000000 00000000 00000000
CPU: Trace cache: 12K uops, L1 D cache: 8K
CPU: L2 cache: 512K
CPU1: Initial APIC ID: 1, Physical Processor ID: 0
CPU: After all inits, caps:        bfebf3ff 00000000 00000000 00000080
Intel machine check reporting enabled on CPU#1.
CPU1: Intel P4/Xeon Extended MCE MSRs (12) available
CPU1: Thermal monitoring enabled
CPU1: Intel(R) Xeon(TM) CPU 2.40GHz stepping 05
CPU 2 irqstacks, hard=c03ec000 soft=c03cc000
Initializing CPU#2
CPU: After generic identify, caps: bfebfbff 00000000 00000000 00000000
CPU: After vendor identify, caps:  bfebfbff 00000000 00000000 00000000
CPU: Trace cache: 12K uops, L1 D cache: 8K
CPU: L2 cache: 512K
CPU2: Initial APIC ID: 6, Physical Processor ID: 3
CPU: After all inits, caps:        bfebf3ff 00000000 00000000 00000080
Intel machine check reporting enabled on CPU#2.
CPU2: Intel P4/Xeon Extended MCE MSRs (12) available
CPU2: Thermal monitoring enabled
CPU2: Intel(R) Xeon(TM) CPU 2.40GHz stepping 05
CPU 3 irqstacks, hard=c03ed000 soft=c03cd000
Initializing CPU#3
CPU: After generic identify, caps: bfebfbff 00000000 00000000 00000000
CPU: After vendor identify, caps:  bfebfbff 00000000 00000000 00000000
CPU: Trace cache: 12K uops, L1 D cache: 8K
CPU: L2 cache: 512K
CPU3: Initial APIC ID: 7, Physical Processor ID: 3
CPU: After all inits, caps:        bfebf3ff 00000000 00000000 00000080
Intel machine check reporting enabled on CPU#3.
CPU3: Intel P4/Xeon Extended MCE MSRs (12) available
CPU3: Thermal monitoring enabled
CPU3: Intel(R) Xeon(TM) CPU 2.40GHz stepping 05
checking TSC synchronization across 4 CPUs: passed.
Brought up 4 CPUs
ACPI: Processor [CPU0] (supports C1)
ACPI: Processor [CPU1] (supports C1)
ACPI: Processor [CPU2] (supports C1)
ACPI: Processor [CPU3] (supports C1)
microcode: CPU0 already at revision 0x29 (current=0x29)
microcode: CPU1 already at revision 0x29 (current=0x29)
microcode: CPU2 already at revision 0x29 (current=0x29)
microcode: CPU3 already at revision 0x29 (current=0x29)

nntp

cat /proc/cpuinfo