现在机器的cpu越来越复杂，一个cpu，经常是几个内核，4，6，8都不是什么稀罕的事情。

现在一台普通的2U的服务器，都可能看到这种场景。

There are some commands here to help identify these type of information quickly on a running Linux:

Total amount of processors including the logical ones:

# cat /proc/cpuinfo | grep "processor"| wc -l

Total amount of CPU package:

# cat /proc/cpuinfo | grep "physical id" | sort | uniq | wc -l

How many cores for each CPU. (Here we should call CPU as physical package as we mentioned above):

# cat /proc/cpuinfo | grep "cpu cores" | wc -l

For each physical CPU, the amount of Logical CPU (the logical CPU can be physical cores, soft cores like threaded, or both).

# cat /proc/cpuinfo | grep "siblings"