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S+S S

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S+S S

检查进程状态时，我看到了很多奇怪的状态

D
I
I<
R+
Rl
S
S+
S<
Sl
Sl+
SLl
SLl+
SN
SNsl
S<s
Ss
Ss+
S<sl
Ssl
Ssl+
STAT
Tl

我学会了 I（空闲）、R（运行）、Sleep，但不知道这些的组合S+ S<，

它们是什么意思？需要参考什么资料？

答案1

如有疑问，请查阅手册页。从命令man ps：

PROCESS STATE CODES
       Here are the different values that the s, stat and state output
       specifiers (header "STAT" or "S") will display to describe the state of
       a process:

               D    uninterruptible sleep (usually IO)
               R    running or runnable (on run queue)
               S    interruptible sleep (waiting for an event to complete)
               T    stopped by job control signal
               t    stopped by debugger during the tracing
               W    paging (not valid since the 2.6.xx kernel)
               X    dead (should never be seen)
               Z    defunct ("zombie") process, terminated but not reaped by
                    its parent

       For BSD formats and when the stat keyword is used, additional
       characters may be displayed:

               <    high-priority (not nice to other users)
               N    low-priority (nice to other users)
               L    has pages locked into memory (for real-time and custom IO)
               s    is a session leader
               l    is multi-threaded (using CLONE_THREAD, like NPTL pthreads
                    do)
               +    is in the foreground process group

希望这可以帮助！

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