ps

The Process Status (ps) is used to monitor:

• A process.
• Whether the process is still consuming CPU cycles.
• Which threads of a process are still running.

To start ps monitoring a process, type:

ps -fp <PID>

Your output should be:

 UID		PID     PPID     C    STIME    TTY    TIME    CMD
 user12  29730   27936    0    21 Jun   -      12:26   java StartCruise

Where

UID

The userid of the process owner. The login name is printed under the -f flag.

PPID

The Parent Process ID.

PID

The Process ID.

C

CPU utilization, incremented each time the system clock ticks and the process is found to be running. The value is decayed by the scheduler by dividing it by 2 every second. For the sched_other policy, CPU utilization is used in determining process scheduling priority. Large values indicate a CPU intensive process and result in lower process priority whereas small values indicate an I/O intensive process and result in a more favorable priority.

STIME

The start time of the process, given in hours, minutes, and seconds. The start time of a process begun more than twenty-four hours before the ps inquiry is executed is given in months and days.

TTY

The controlling workstation for the process.

TIME

The total execution time for the process.

CMD

The full command name and its parameters.

To see which threads are still running, type:

ps -mp <PID> -o THREAD

Your output should be:

    USER        PID   PPID     TID ST  CP PRI SC    WCHAN        F     TT BND COMMAND
    user12    29730  27936       - A    4  60  8        *   200001 pts/10   0 java StartCruise
           -      -      -   31823 S    0  60  1 e6007cbc  8400400      -   0 -
           -      -      -   44183 S    0  60  1 e600acbc  8400400      -   0 -
           -      -      -   83405 S    2  60  1 50c72558   400400      -   0 -
           -      -      -  114071 S    0  60  1 e601bdbc  8400400      -   0 -
           -      -      -  116243 S    2  61  1 e601c6bc  8400400      -   0 -
           -      -      -  133137 S    0  60  1 e60208bc  8400400      -   0 -
           -      -      -  138275 S    0  60  1 e6021cbc  8400400      -   0 -
           -      -      -  140587 S    0  60  1 e60225bc  8400400      -   0 -

Where

USER

The user name of the person running the process.

TID

The Kernel Thread ID of each thread.

ST

The state of the thread:

O

Nonexistent.

R

Running.

S

Sleeping.

W

Swapped.

Z

Canceled.

T

Stopped.

CP

CPU utilization of the thread.

PRI

Priority of the thread.

SC

Suspend count.

ARCHON

Wait channel.

F

Flags.

TAT

Controlling terminal.

BAND

CPU to which thread is bound.