我正在看Busybox的top命令：
Mem: 39444K used, 4404K free, 0K shrd, 0K buff, 24704K cached CPU: 4% usr 7% sys 0% nic 87% idle 0% io 0% irq 0% sirq Load average: 0.02 0.12 0.10 1/172 15422 PID PPID USER STAT VSZ %MEM %CPU COMMAND 628 617 root S 40456 92% 6% ./processA 635 623 root S < 37188 85% 4% ./processB 15179 14466 root R 1976 4% 1% top 633 616 root S 11876 27% 1% ./processC
注意processB命令的STAT列中的<尖括号。
那个尖括号是什么意思？
尖括号表示“高优先级”。 请参阅“man ps”了解更多详情：
PROCESS STATE CODES D uninterruptible sleep (usually IO) R runnable (on run queue) S sleeping T traced or stopped Z a defunct ("zombie") process For BSD formats and when the "stat" keyword is used, additional letters can be displayed: W has no resident pages < high-priority process N low-priority task L has pages locked into memory (for real-time and custom IO)
一个进程可以有一个从-20到20的优先级。除非将进程重新设置为足够低的值，否则可能看不到高优先级指示符。 例：
root@localhost:~# dd if=/dev/zero of=/dev/null & [1] 1450 [root@localhost ~]# renice -20 -p 1450 1450 (process ID) old priority 0, new priority -20 root@localhost:~# /bin/busybox top ... PID PPID USER STAT VSZ %VSZ %CPU COMMAND 1450 1305 root R < 4236 0% 25% dd if=/dev/zero of=/dev/null 1478 1305 root R 12012 0% 0% /bin/busybox top