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Time field showing Zero in ps command output

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# 1  
Old 05-04-2015
HP Time field showing Zero in ps command output
Code:
  F S      UID   PID  PPID  C PRI NI             ADDR   SZ            WCHAN    STIME TTY       TIME COMD
401 S   catmgr  5748  5742  0 154 20 e0000006d48cd080  133 e0000003fb6e7200 11:22:32 ?         0:00 /opt/ssh/libexec/sftp-server
3401 R   catmgr  5742  5631  0 152 20 e0000005f974fa00  750                - 11:22:31 ?         0:00 sshd: catmgr@notty
421 T   catmgr 14751 18253  0 186 24 e000000685a6c380  327                - 09:33:57 pts/14    0:00 ksh cat_Duplicate_Records_Removal.ksh
421 T   catmgr  3495 18253  0 158 24 e0000009ceca7080  327                - 09:30:09 pts/14    0:00 ksh cat_Duplicate_Records_Removal.ksh
3401 S   catmgr  9317  9152  0 154 20 e000000654b27400  622 e0000003fb6e7080 04:50:51 ?         0:00 sshd: catmgr@notty
1401 T   catmgr  4091     1  0 152 24 e0000005a6abf700  624                -  Apr 23  ?         0:00 ssh catmgr@g4u1993c.houston.hp.com ksh /DI_Data_HU1/infa_shared/cat/CODE/sh/Reporting_Jobs.sh
401 S   catmgr  9558     1  0 158 20 e0000008ae70ad00  331 e00000063bfa4980 09:44:39 ?         0:00 ksh Reporting_Jobs.sh


I am using HP-ux

I dont know why the time field is shown as 0:00 for running process and why '?' is shown for tty field.

anyone please shed some light on this..

thank you
# 2  
Old 05-04-2015
The ? means the process is not connected to a controlling terminal.
Since computers are very fast and ps has limited number of significant digits, some small values are rounded down to 0.00.

For example a process could have .004 seconds of actual cpu usage, which would display as 0.00 Any process that shows in ps has to have used at least a tiny bit of cpu to have been created.

Do you have a problem you are trying to solve?
This User Gave Thanks to jim mcnamara For This Post:
TomG
# 3  
Old 05-04-2015
Quote:
Originally Posted by jim mcnamara
The ? means the process is not connected to a controlling terminal.
Since computers are very fast and ps has limited number of significant digits, some small values are rounded down to 0.00.

For example a process could have .004 seconds of actual cpu usage, which would display as 0.00 Any process that shows in ps has to have used at least a tiny bit of cpu to have been created.

Do you have a problem you are trying to solve?

yes i have a problem.(I started playing around with PS becasue of the below issue). Can you please suggest an alternative method for 'disown' command as its not supported in my HP-UX
Korn Shell script in stopped state while running in background
# 4  
Old 05-04-2015
disown builtin is in ksh93. HP-UX 11.31 and older have ksh88.
Workaround is closing or redirecting all the file handles, at minimum stdin(0), stdout(1), stderr(2).
TIME is accumulated CPU usage. Actual CPU usage is PCPU.
You can display all the times with this:
Code:
UNIX95=1 ps -eo pid,user,time,etime,stime,pcpu,args

Average CPU consumption is the quotient (time / etime), (CPU time / Elapsed time).
The stime is an absolute time of the process start, usually less precise than (current_time - etime).
This User Gave Thanks to MadeInGermany For This Post:
TomG
# 5  
Old 05-13-2015
Quote:
Originally Posted by TomG
Code:
  F S      UID   PID  PPID  C PRI NI             ADDR   SZ            WCHAN    STIME TTY       TIME COMD
401 S   catmgr  5748  5742  0 154 20 e0000006d48cd080  133 e0000003fb6e7200 11:22:32 ?         0:00 /opt/ssh/libexec/sftp-server
3401 R   catmgr  5742  5631  0 152 20 e0000005f974fa00  750                - 11:22:31 ?         0:00 sshd: catmgr@notty
421 T   catmgr 14751 18253  0 186 24 e000000685a6c380  327                - 09:33:57 pts/14    0:00 ksh cat_Duplicate_Records_Removal.ksh
421 T   catmgr  3495 18253  0 158 24 e0000009ceca7080  327                - 09:30:09 pts/14    0:00 ksh cat_Duplicate_Records_Removal.ksh
3401 S   catmgr  9317  9152  0 154 20 e000000654b27400  622 e0000003fb6e7080 04:50:51 ?         0:00 sshd: catmgr@notty
1401 T   catmgr  4091     1  0 152 24 e0000005a6abf700  624                -  Apr 23  ?         0:00 ssh catmgr@g4u1993c.houston.hp.com ksh /DI_Data_HU1/infa_shared/cat/CODE/sh/Reporting_Jobs.sh
401 S   catmgr  9558     1  0 158 20 e0000008ae70ad00  331 e00000063bfa4980 09:44:39 ?         0:00 ksh Reporting_Jobs.sh


I am using HP-ux

I dont know why the time field is shown as 0:00 for running process and why '?' is shown for tty field.

anyone please shed some light on this..

thank you

I believe this link will be of some use

The UNIX School: ps command : what does the TIME indicate?
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