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内存

VIRT: 任务所使用的所有虚拟内存大小。 It includes all code, data and shared libraries plus pages that have been swapped out
RES：任何占用物理内存的东西。包括共享内存
SHR：任务所使用的共享内存。

https://sites.google.com/site/bipisdips/linux/top-command-virt-shr-and-res

状态

• D = uninterruptible sleep，通常因为磁盘 IO 导致不可中断状态。
• I = idle
• R = running
• S = sleeping
• T = stopped by job control signal
• t = stopped by debugger during trace
• Z = zombie