RE: PS output for threads

"Abu M. Muttalib" <abum@xxxxxxxxx> · Fri, 26 May 2006 13:00:24 +0530

Hi 
Tayseer,

Thanks for your reply.

The 
log shows new PID for different thread, but threads/process marked in red color 
have different PPID, why this is so?

My 
main question remained unanswered: Are the processes with the same name 
represent threads? Is there a direct correlation between no of threads created 
and no shown in the output of ps?

Regards,
Abu.
Abu M. Muttalib
Associate,
Aftek Infosys Ltd.,
Pune, 
India
Office: 91-20-25449260-65 X-254
Email: 
abum@xxxxxxxxx

  -----Original Message-----
From: MHD.Tayseer Alquoatli 
  [mailto:idoit.ief@xxxxxxxxx]
Sent: Friday, May 26, 2006 12:42 
  PM
To: Abu M. Muttalib
Cc: 
  kernelnewbies@xxxxxxxxxxxx
Subject: Re: PS output for 
  threads

  On 5/26/06, Abu M. 
  Muttalib <abum@xxxxxxxxx> 
  wrote:

    Hi 
    Tayseer,

Hi Abu 
http://en.wikipedia.org/wiki/Top_posting

    I don't agree with that. 
    For any thread there will be a new task struct, and hence there will be new 
    process ID and all.

This is true .. but this is now what i've said
for each new 
  threads there will be a new task, new process id "pid", all threads have the 
  same parent id "ppid" and the same process group id "pgid" and this is what is 
  shown in your log
"Linux doesn't differentiate between processes and 
  threads cause they all are tasks" i mean that both processes and threads will 
  be presented by a task struct
CMIIW please
thanks

    for example I have the 
    following log:

      PID 
    USER     STATUS   RSS  PPID %CPU %MEM 
    COMMAND
  942 yoku     
    R        828   871  
    1.9  5.7 busybox
  834 yoku     
    S       2620     1  
    0.0 18.3 hopper
  891 yoku     
    S       2620   890  0.0 18.3 
    hopper
  890 yoku     
    S       2620   834  0.0 18.3 
    hopper
  871 yoku     
    S       1340     1  
    0.0  9.3 sh
  875 yoku     
    S       1336   874  0.0  
    9.3 Angelia
  872 yoku     
    S       1336     1  
    0.0  9.3 Angelia
  887 yoku     
    S       1336   874  0.0  
    9.3 Angelia
  888 yoku     S 
    <     1336   874  0.0  9.3 
    Angelia
  876 yoku     
    S       1336   874  0.0  
    9.3 Angelia
  884 yoku     
    S       1336   874  0.0  
    9.3 Angelia
  885 yoku     
    S       1336   874  0.0  
    9.3 Angelia
  874 yoku     
    S       1336   872  0.0  
    9.3 Angelia
  883 yoku     
    S       1336   874  0.0  
    9.3 Angelia
  886 yoku     
    S       1336   874  0.0  
    9.3 Angelia
  766 yoku     
    S       1092     1  
    0.0  7.6 SIMSCRIPT1
  767 yoku     
    S       1092     1  
    0.0  7.6 SIMSCRIPT2
  836 yoku     
    S        800     
    1  0.0  5.5 btsdpd
  811 yoku     
    S        712     
    1  0.0  4.9 btsrv

    Regards,

    Abu.
    Abu M. Muttalib
Associate,
Aftek Infosys 
    Ltd.,
Pune, India
Office: 91-20-25449260-65 X-254
Email: abum@xxxxxxxxx

    -----Original 
    Message-----
From: MHD.Tayseer Alquoatli [mailto:idoit.ief@xxxxxxxxx]
Sent: Friday, May 26, 2006 
    11:58 AM
To: Abu M. Muttalib
Cc: kernelnewbies@xxxxxxxxxxxx
Subject: Re: PS 
    output for threads

    On 5/25/06, Abu M. 
    Muttalib <abum@xxxxxxxxx> wrote: 
    Hi,

I 
      have an application wherein I have say 10 threads which are 
      created
unconditionally and run a "while(1);".

Will they be 
      shown in the output of ps -A as 10 different processes?

Hi 
cause Linux don't differentiate between process and a 
    threads .. they are all tasks
all your threads have the same parent 
    process id "ppid" and share the same process group id "pgid"
hope this 
    helps

-- 
MHD.Tayseer 

-- 
MHD.Tayseer 