linux下获取进程线程情况


linux 没有真正的线程, linux 上的线程是轻量级进程LWP.

The main difference between a light weight process (LWP) and a normal process is that LWPs share the same address space and other resources like open files etc. As some resources are shared so these processes are considered to be light weight as compared to other normal processes and hence the name light weight processes.

获取进程的线程情况

➜  ~ ps -Lf 1210
UID        PID  PPID   LWP  C NLWP STIME TTY      STAT   TIME CMD
mysql     1210     1  1210  0   10 4月17 ?       Ssl    0:02 /usr/sbin/mariadbd
mysql     1210     1  1478  0   10 4月17 ?       Ssl    3:24 /usr/sbin/mariadbd
mysql     1210     1  1479  0   10 4月17 ?       Ssl    0:01 /usr/sbin/mariadbd
mysql     1210     1  1480  0   10 4月17 ?       Ssl    0:00 /usr/sbin/mariadbd
mysql     1210     1  1481  0   10 4月17 ?       Ssl    0:00 /usr/sbin/mariadbd
mysql     1210     1  1492  0   10 4月17 ?       Ssl    0:00 /usr/sbin/mariadbd
mysql     1210     1  1566  0   10 4月17 ?       Ssl    0:00 /usr/sbin/mariadbd
mysql     1210     1  9933  0   10 5月16 ?       Ssl    0:00 /usr/sbin/mariadbd
mysql     1210     1  9937  0   10 5月16 ?       Ssl    0:00 /usr/sbin/mariadbd
mysql     1210     1 13703  0   10 00:11 ?        Ssl    0:00 /usr/sbin/mariadbd
➜  ~ ls -l /proc/1210/task/
总用量 0
dr-xr-xr-x 7 mysql mysql 0 5月  16 13:44 1210
dr-xr-xr-x 7 mysql mysql 0 5月  17 00:12 13703
dr-xr-xr-x 7 mysql mysql 0 5月  16 13:44 1478
dr-xr-xr-x 7 mysql mysql 0 5月  16 13:44 1479
dr-xr-xr-x 7 mysql mysql 0 5月  16 13:44 1480
dr-xr-xr-x 7 mysql mysql 0 5月  16 13:44 1481
dr-xr-xr-x 7 mysql mysql 0 5月  16 13:44 1492
dr-xr-xr-x 7 mysql mysql 0 5月  16 13:44 1566
dr-xr-xr-x 7 mysql mysql 0 5月  17 00:12 9933
dr-xr-xr-x 7 mysql mysql 0 5月  17 00:12 9937
➜  ~ top -Hp 1210
top - 00:18:19 up 29 days,  7:20,  1 user,  load average: 0.21, 0.15, 0.13
Threads:  10 total,   0 running,  10 sleeping,   0 stopped,   0 zombie
%Cpu(s):  0.0 us,  0.0 sy,  0.0 ni,100.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem :  1881996 total,    85684 free,   900112 used,   896200 buff/cache
KiB Swap:        0 total,        0 free,        0 used.   791844 avail Mem

  PID USER      PR  NI    VIRT    RES    SHR S %CPU %MEM     TIME+ COMMAND
 1210 mysql     20   0 1158504 130800   7732 S  0.0  7.0   0:02.17 mariadbd
 1478 mysql     20   0 1158504 130800   7732 S  0.0  7.0   3:24.05 mariadbd
 1479 mysql     20   0 1158504 130800   7732 S  0.0  7.0   0:01.59 mariadbd
 1480 mysql     20   0 1158504 130800   7732 S  0.0  7.0   0:00.00 mariadbd
 1481 mysql     20   0 1158504 130800   7732 S  0.0  7.0   0:00.05 mariadbd
 1492 mysql     20   0 1158504 130800   7732 S  0.0  7.0   0:00.00 mariadbd
 1566 mysql     20   0 1158504 130800   7732 S  0.0  7.0   0:00.00 mariadbd
 9933 mysql     20   0 1158504 130800   7732 S  0.0  7.0   0:00.22 mariadbd
 9937 mysql     20   0 1158504 130800   7732 S  0.0  7.0   0:00.24 mariadbd
13703 mysql     20   0 1158504 130800   7732 S  0.0  7.0   0:00.00 mariadbd
➜  ~ pstree -p 1210
mariadbd(1210)─┬─{mariadbd}(1478)
               ├─{mariadbd}(1479)
               ├─{mariadbd}(1480)
               ├─{mariadbd}(1481)
               ├─{mariadbd}(1492)
               ├─{mariadbd}(1566)
               ├─{mariadbd}(13703)
               ├─{mariadbd}(15228)
               ├─{mariadbd}(15229)
               ├─{mariadbd}(15230)
               └─{mariadbd}(15231)

ref

what-is-the-difference-between-lightweight-process-and-thread


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