Linux Shell Scripting Cookbook - Third Edition

Information about process threads

The -L option to ps will display information about process threads. This option adds an LWP column to the thread ID. Adding the -f option to -L (-Lf) adds two columns: NLWP, the thread count, and LWP, the thread ID:

    $ ps -Lf
    UID  PID  PPID  LWP  C  NLWP  STIME  TTY  TIME     
        CMD
    user 1611 1     1612 0  2     Jan16  ?    00:00:00    
        /usr/lib/gvfs/gvfsd

This command lists five processes with a maximum number of threads:

$ ps -eLf --sort -nlwp | head -5
UID        PID  PPID   LWP  C NLWP STIME TTY  TIME     
     CMD
root       647     1   647  0   64 14:39 ?    00:00:00 
     /usr/sbin/console-kit-daemon --no-daemon
root       647     1   654  0   64 14:39 ?    00:00:00 
     /usr/sbin/console-kit-daemon --no-daemon
root       647     1   656  0   64 14:39 ?    00:00:00 
     /usr/sbin/console-kit-daemon --no-daemon
root ...