Google Answers: Process IDs of all processes running in a process group : Linux ?

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Q: Process IDs of all processes running in a process group : Linux ? ( No Answer, 1 Comment )

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Subject: Process IDs of all processes running in a process group : Linux ?
Category: Computers > Operating Systems
Asked by: virajpurang-ga
List Price: $30.00

Posted: 16 Apr 2003 11:09 PDT
Expires: 27 Jun 2003 11:05 PDT
Question ID: 191312

How can I list all the java processes (with their process IDS) which have been started under a given "process group" id on linux (Red Hat Linux).I need this in order to take thread dumps of Java processes only in that process group..
Request for Question Clarification by sgtcory-ga on 16 Apr 2003 13:27 PDT Are you needing this for home use? I found this, and I think I may even use it :-) Treeps http://www.orbit2orbit.com/gmd/tps/treepsfm.html I had never even heard of this before. I'm an abuser of 'top' and 'ps'. Let me know if we are getting close to what you are looking for. In the meantime I will leave this question open for clarification, in case another researcher has a more definite answer. Thanks! SgtCory
Request for Question Clarification by denco-ga on 16 Apr 2003 13:40 PDT Howdy virajpurang! I am going to post this as a Request for Question Clarification in the case I have not made the target, or in the case the process and/or flags do not work on your version of Linux. These commands have been tested on a Red Hat Linux 7.x box. If you have a known and unique process group, such as mysql in this example, that is the only one running the task, you can do: ps -g mysql PID TTY TIME CMD 1248 ? 00:00:00 mysqld 1250 ? 00:00:00 mysqld 1251 ? 00:00:00 mysqld If you have a known process group that might be running other processes, such as root in this example, you can do: ps -g root \| grep sendmail PID TTY TIME CMD 7362 ? 00:00:00 sendmail 7463 ? 00:00:00 sendmail 7471 ? 00:00:00 sendmail 8052 ? 00:00:00 sendmail 8208 ? 00:00:00 sendmail 8244 ? 00:00:00 sendmail If this works for you, or if you need further work done on this question, please feel free to ask for clarification. Search strategy Personal experience with Linux and some command line testing. Looking Forward, denco-ga
Clarification of Question by virajpurang-ga on 16 Apr 2003 15:10 PDT I am using this Perl script : sub timed_system { local($command,$time) = @_; local($ret) = 9999; if (!defined($child_pid = fork())) { print("Fork Error\n"); } elsif ( $child_pid ) { # This is the parent. Wait and kill if necessary. # (Eval/alarm structure taken from perlipc man page.) eval { local $SIG{ALRM} = sub { die "timeout!" }; alarm $time; waitpid($child_pid,0); $ret = ($? >> 8); print "Child returned $ret following normal wait\n"; alarm 0; }; if ($@ and $@ =~ /timeout/) { # Kill the child and all in it's process group. print "TIMEOUT! [$command] $child_pid\n"; kill(3,-$child_pid); sleep 2; kill(9,-$child_pid); sleep 2; waitpid($child_pid,WNOHANG); $ret = 121; } print "End * $time [$command] $$ <$ret>\n"; } else { # This is the child. Give myself a new process group, # then run the command. print "Start * $time [$command] $$\n"; setpgrp($$); exec($command) or print "couldn't exec foo: $! \n"; print "*********** Should never get here!"; exit 1; } return $ret; } So I have the Process Group id given by $child_pid, now I want the list of all processes in the Process Group given by this number, so that I can pick and choose the Java processes that I want to take Thread dumps of.
Clarification of Question by virajpurang-ga on 16 Apr 2003 15:26 PDT Also I tried the "ps -g" that you suggested.This essentially does not work with the unique Process Group id, something that comes closer but does not answer my question still is "ps -jx". You wil liunderstand my confusion if you see the differences in the output of both these commands on my system. ps jx gives (Third column gives the process group id , and there are atleast 10 processes with a process group if of 2540 in the listing given below.) [ccuser@linux3 wli]$ ps jx \| grep java 2540 2548 2540 2382 ? -1 SN 55004 3:47 java -cp :/export/home/ 2548 2549 2540 2382 ? -1 SN 55004 0:02 java -cp :/export/home/ 2549 2550 2540 2382 ? -1 SN 55004 0:21 java -cp :/export/home/ 2549 2551 2540 2382 ? -1 SN 55004 0:00 java -cp :/export/home/ 2549 2552 2540 2382 ? -1 SN 55004 0:00 java -cp :/export/home/ 2549 2553 2540 2382 ? -1 SN 55004 5:25 java -cp :/export/home/ 2549 2554 2540 2382 ? -1 SN 55004 0:00 java -cp :/export/home/ 2549 2555 2540 2382 ? -1 SN 55004 0:00 java -cp :/export/home/ 2549 2556 2540 2382 ? -1 SN 55004 0:03 java -cp :/export/home/ 2549 2558 2540 2382 ? -1 SN 55004 0:00 java -cp :/export/home/ 2549 2559 2540 2382 ? -1 SN 55004 0:43 java -cp :/export/home/ 1 15733 15713 15561 ? -1 S 55004 0:02 /usr/java/j2sdk1.4.0_02 15733 15734 15713 15561 ? -1 S 55004 0:01 /usr/java/j2sdk1.4.0_02 15734 15735 15713 15561 ? -1 S 55004 0:21 /usr/java/j2sdk1.4.0_02 15734 15736 15713 15561 ? -1 S 55004 0:00 /usr/java/j2sdk1.4.0_02 15734 15737 15713 15561 ? -1 S 55004 0:00 /usr/java/j2sdk1.4.0_02 15734 15738 15713 15561 ? -1 S 55004 5:53 /usr/java/j2sdk1.4.0_02 15734 15739 15713 15561 ? -1 S 55004 0:00 /usr/java/j2sdk1.4.0_02 15734 15740 15713 15561 ? -1 S 55004 0:00 /usr/java/j2sdk1.4.0_02 15734 15741 15713 15561 ? -1 S 55004 0:02 /usr/java/j2sdk1.4.0_02 15734 15746 15713 15561 ? -1 S 55004 0:03 /usr/java/j2sdk1.4.0_02 15734 15747 15713 15561 ? -1 S 55004 0:00 /usr/java/j2sdk1.4.0_02 15734 15753 15713 15561 ? -1 S 55004 0:00 /usr/java/j2sdk1.4.0_02 15734 15766 15713 15561 ? -1 S 55004 0:00 /usr/java/j2sdk1.4.0_02 15734 15767 15713 15561 ? -1 S 55004 0:34 /usr/java/j2sdk1.4.0_02 15734 15768 15713 15561 ? -1 S 55004 0:00 /usr/java/j2sdk1.4.0_02 15734 15769 15713 15561 ? -1 S 55004 0:00 /usr/java/j2sdk1.4.0_02 15734 15770 15713 15561 ? -1 S 55004 0:00 /usr/java/j2sdk1.4.0_02 15734 15771 15713 15561 ? -1 S 55004 0:28 /usr/java/j2sdk1.4.0_02 2559 22537 2540 2382 ? -1 SN 55004 0:02 /usr/java/j2sdk1.4.0_02 2549 22538 2540 2382 ? -1 SN 55004 0:00 java -cp :/export/home/ 2549 22539 2540 2382 ? -1 SN 55004 0:00 java -cp :/export/home/ 2549 22540 2540 2382 ? -1 SN 55004 0:00 java -cp :/export/home/ 2549 22541 2540 2382 ? -1 SN 55004 0:00 java -cp :/export/home/ 22537 22542 2540 2382 ? -1 SN 55004 0:00 /usr/java/j2sdk1.4.0_02 22542 22543 2540 2382 ? -1 SN 55004 0:00 /usr/java/j2sdk1.4.0_02 22542 22544 2540 2382 ? -1 SN 55004 0:00 /usr/java/j2sdk1.4.0_02 22542 22545 2540 2382 ? -1 SN 55004 0:00 /usr/java/j2sdk1.4.0_02 22542 22546 2540 2382 ? -1 SN 55004 0:02 /usr/java/j2sdk1.4.0_02 22542 22547 2540 2382 ? -1 SN 55004 0:00 /usr/java/j2sdk1.4.0_02 22542 22548 2540 2382 ? -1 SN 55004 0:00 /usr/java/j2sdk1.4.0_02 22542 22549 2540 2382 ? -1 SN 55004 0:00 /usr/java/j2sdk1.4.0_02 22542 22551 2540 2382 ? -1 SN 55004 0:00 /usr/java/j2sdk1.4.0_02 22542 22552 2540 2382 ? -1 SN 55004 0:00 /usr/java/j2sdk1.4.0_02 22542 22596 2540 2382 ? -1 SN 55004 0:00 /usr/java/j2sdk1.4.0_02 22542 22597 2540 2382 ? -1 SN 55004 0:00 /usr/java/j2sdk1.4.0_02 22542 22598 2540 2382 ? -1 SN 55004 0:00 /usr/java/j2sdk1.4.0_02 22542 22599 2540 2382 ? -1 SN 55004 0:00 /usr/java/j2sdk1.4.0_02 14207 26852 26851 14207 pts/1 26851 S 55004 0:00 grep java [ccuser@linux3 wli]$ but a "ps -g 2540" gives the following [ccuser@linux3 wli]$ ps -g 2540 PID TTY TIME CMD [ccuser@linux3 wli]$ Am I missing usage somewhere ?
Request for Question Clarification by denco-ga on 16 Apr 2003 15:42 PDT Howdy virajpurang! Try using the following (using your example) instead: ps -G 2540 Note the capital "G" instead of the lower case "g". I think you can only use the local case "g" with actual names of groups (mysql): ps -g 626 PID TTY TIME CMD ps -G 626 PID TTY TIME CMD 25466 pts/1 00:00:00 tcsh 25484 pts/1 00:00:00 ps Looking Forward, denco-ga
Clarification of Question by virajpurang-ga on 16 Apr 2003 15:45 PDT Did you see the Perl script that I had added ?
Clarification of Question by virajpurang-ga on 16 Apr 2003 15:49 PDT I tried that too ... [ccuser@linux3 wli]$ ps -G 2540 PID TTY TIME CMD was what I got still ... I have tried ps -f, ps --Group, and ps --group but nothing works.
Clarification of Question by virajpurang-ga on 16 Apr 2003 15:55 PDT In any cae this is a very cool service that you guys have added ...and you guys are very helpful to talk to ...
Request for Question Clarification by denco-ga on 16 Apr 2003 16:37 PDT Howdy virajpurang! Yep, saw your perl code, but that really isn't my strong suit, so... I tested some more, and the ps -g (back to lower case) command at least got some results. [moviet@robin ~]$ ps ajx \| grep mysql PPID PID PGID SID TTY TPGID STAT UID TIME COMMAND 1220 1248 328 328 ? -1 S 407 0:00 /usr/sbin/mysqld --base 1248 1250 328 328 ? -1 S 407 0:00 /usr/sbin/mysqld --base 1250 1251 328 328 ? -1 S 407 0:00 /usr/sbin/mysqld --base [moviet@robin ~]$ ps -g 328 \| grep mysqld PID TTY TIME CMD 1220 ? 00:00:00 safe_mysqld 1248 ? 00:00:00 mysqld 1250 ? 00:00:00 mysqld 1251 ? 00:00:00 mysqld Perhaps you could do a ps jx and then sort/grep/sed, etc. to get the results (2540 in the third row, etc.) that you need. My pleasure! denco-ga
Request for Question Clarification by maniac-ga on 16 Apr 2003 16:46 PDT Hello Virajpurang, Another suggestions Customize the output of ps. From http://www.die.net/doc/linux/man/man1/ps.1.html (or man ps), scroll down to the example of ps -eo. If you just want pairs of process ID's and process groups, try ps -eo pgid,pid and add -A (for all processes), --user (to select by a specific user), or other selection criteria. The output in this case will be limited to just the fields you are looking for. --Maniac
Request for Question Clarification by maniac-ga on 14 May 2003 17:29 PDT Hello Virajpurang, Did you get the answer you needed? If so, you may want to indicate that and who should answer the question (so that researcher gets paid). if not, what more do you need? --Maniac

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Subject: Re: Process IDs of all processes running in a process group : Linux ?
From: chakrapani-ga on 18 Apr 2003 11:52 PDT

Hi
  Here is what u can do 
#pstree -cap 

this will give u some thing like this
init,1)
  |-safe_mysqld,751) /usr/bin/safe_mysqld --datadir=/var/lib/mysql ...
  |   `-mysqld,779) --basedir=/ --datadir=/var/lib/mysql --user=mysql ...
  |       `-mysqld,783) --basedir=/ --datadir=/var/lib/mysql --user=mysql ...
  |           `-mysqld,784) --basedir=/ --datadir=/var/lib/mysql ...
  |-screen,10213)
  |   `-bash,10214)
  |-screen,28491)
  |   `-bash,28492)
  |-sendmail,609)
  |-sendmail,603)
  |-sshd,506)
  |   `-sshd,15156)
  |       `-sshd,15158)
  |           `-bash,15159)
  |               `-su,15174) -
  |                   `-bash,15175)
  |                       `-pstree,15189) -cap
  `-syslogd,359)

Now suppose u dont want to see all that ; then do this 
# pstree -cap 15159

then u will get CHhild process of  15159

bash,15159)
  `-su,15174) -
      `-bash,15175)
          `-pstree,15191) -cap 15159

This my processess ...  

If u need to do every time and u dont want to waste time finding ProcessID
then try this script
 
#!/bin/bash
PIDJ=`java some_process 1> /dev/null 2> /dev/null ; echo $$`
pstree -cap $PIDJ

OK In case u decide to watch the whole process how it changes do this

watch -n1 pstree -cap 15159


Hope that helps ... do let me know if this helped

Regards

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