Как определить использует centos два процессора или один?
Можно просто запустить top
Затем нажать клавишу 1 (единица)
Получите примерно следующую картинкуtop - 19:56:47 up 70 days, 22:17,  1 user,  load average: 1.06, 0.78, 0.54
Tasks: 313 total,   1 running, 312 sleeping,   0 stopped,   0 zombie
Cpu0  :  0.3%us,  0.7%sy,  0.0%ni, 98.0%id,  0.0%wa,  1.0%hi,  0.0%si,  0.0%st
Cpu1  :  0.0%us,  0.0%sy,  0.0%ni,100.0%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu2  :  0.0%us,  0.0%sy,  0.0%ni,100.0%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu3  :  3.0%us,  0.3%sy,  0.0%ni, 96.7%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu4  :  0.3%us,  0.0%sy,  0.0%ni, 99.7%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu5  :  0.0%us,  0.0%sy,  0.0%ni,100.0%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu6  :  0.0%us,  0.0%sy,  0.0%ni,100.0%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu7  :  2.3%us,  0.3%sy,  0.0%ni, 95.4%id,  0.0%wa,  2.0%hi,  0.0%si,  0.0%st
Cpu8  :  0.0%us,  0.3%sy,  0.0%ni, 99.7%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu9  :  0.0%us,  0.0%sy,  0.0%ni, 99.7%id,  0.0%wa,  0.3%hi,  0.0%si,  0.0%st
Cpu10 :  0.0%us,  0.0%sy,  0.0%ni,100.0%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu11 :  0.0%us,  0.0%sy,  0.0%ni,100.0%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:  16391940k total, 16131308k used,   260632k free,   256568k buffers
Swap: 16732028k total,   283700k used, 16448328k free, 13885680k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
21055 www-data  20   0  367m  86m  44m S    3  0.5  11:36.53 php5-fpm
25425 davfs2    20   0 62632 5408 1744 S    2  0.0  10:05.34 mount.davfs
27192 root      20   0 17472 1480  972 R    1  0.0   0:00.07 top
    8 root      20   0     0    0    0 S    0  0.0 100:22.51 rcuos/0
 9367 redis     20   0 11232 1436  688 S    0  0.0  46:09.99 redis-server
18792 www-data  20   0  121m 4192 1120 S    0  0.0  17:43.58 nginx
    1 root      20   0 24340 1848 1020 S    0  0.0   0:11.06 init
    2 root      20   0     0    0    0 S    0  0.0   0:01.67 kthreadd
    3 root      20   0     0    0    0 S    0  0.0   4:23.58 ksoftirqd/0
    5 root       0 -20     0    0    0 S    0  0.0   0:00.00 kworker/0:0H
    7 root      20   0     0    0    0 S    0  0.0  89:01.35 rcu_sched
    9 root      20   0     0    0    0 S    0  0.0  21:43.56 rcuos/1
   10 root      20   0     0    0    0 S    0  0.0  17:40.52 rcuos/2
   11 root      20   0     0    0    0 S    0  0.0  17:40.02 rcuos/3
   12 root      20   0     0    0    0 S    0  0.0  16:00.85 rcuos/4
   13 root      20   0     0    0    0 S    0  0.0  14:39.94 rcuos/5
Поставьте htop и смотрите на загрузку процессоров.