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Full Discussion: Process wait time
Operating Systems Solaris Process wait time Post 302136623 by chandrakala.sg on Wednesday 19th of September 2007 01:02:37 AM
Old 09-19-2007
Process wait time

Hi all,

I am trying to find out the process wait time on Unix(AIX/SOLARIS) machine( only sh/ksh/csh):

Like

EXAMPLE 1 :
$ vmstat 2

System configuration: lcpu=16 mem=32000MB

kthr memory page faults cpu
----- ----------- ------------------------ ------------ -----------
r b avm fre re pi po fr sr cy in sy cs us sy id wa
0 0 2172424 3312438 0 0 0 0 0 0 9 1187 158 0 0 99 0
0 0 2172426 3312436 0 0 0 0 0 0 3 1042 112 0 0 99 0
1 0 2172426 3312431 0 0 0 0 0 0 6 1413 120 9 0 91 0

The red colored numbers here shows the cpu wait.


We can find out which process is waiting using ps -el , but it gives the event address in the system
EXAMPLE 2 :

ps -el
F S UID PID PPID C PRI NI ADDR SZ WCHAN TTY TIME CMD
200003 A 0 1 0 0 60 20 18001400 688 - 3:11 init
240001 A 0 147682 1 0 60 20 4828b400 520 * - 242:01 syncd
240001 A 0 274448 258308 0 60 20 380272400 1404 - 229:46 dtgreet
240001 A 0 299146 331868 0 60 20 b8395400 284 f100060004374208 - 0:00 writesrv
240001 A 1 311410 331868 0 60 20 1283a7400 1380 - 0:00 rpc.statd


But I want to know the process wait time. Any help in this regard is appreciated.
 
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wait(1)                                                            User Commands                                                           wait(1)

NAME
wait - await process completion SYNOPSIS
/bin/sh wait [pid...] /bin/jsh /bin/ksh /usr/xpg4/bin/sh wait [pid...] wait [ % jobid...] /bin/csh wait DESCRIPTION
The shell itself executes wait, without creating a new process. If you get the error message cannot fork,too many processes, try using the wait command to clean up your background processes. If this doesn't help, the system process table is probably full or you have too many active foreground processes. There is a limit to the number of process IDs associated with your login, and to the number the system can keep track of. Not all the processes of a pipeline with three or more stages are children of the shell, and thus cannot be waited for. /bin/sh, /bin/jsh Wait for your background process whose process ID is pid and report its termination status. If pid is omitted, all your shell's currently active background processes are waited for and the return code will be 0. The wait utility accepts a job identifier, when Job Control is enabled (jsh), and the argument, jobid, is preceded by a percent sign (%). If pid is not an active process ID, the wait utility will return immediately and the return code will be 0. csh Wait for your background processes. ksh When an asynchronous list is started by the shell, the process ID of the last command in each element of the asynchronous list becomes known in the current shell execution environment. If the wait utility is invoked with no operands, it will wait until all process IDs known to the invoking shell have terminated and exit with an exit status of 0. If one or more pid or jobid operands are specified that represent known process IDs (or jobids), the wait utility will wait until all of them have terminated. If one or more pid or jobid operands are specified that represent unknown process IDs (or jobids), wait will treat them as if they were known process IDs (or jobids) that exited with exit status 127. The exit status returned by the wait utility will be the exit status of the process requested by the last pid or jobid operand. The known process IDs are applicable only for invocations of wait in the current shell execution environment. OPERANDS
The following operands are supported: One of the following: pid The unsigned decimal integer process ID of a command, for which the utility is to wait for the termination. jobid A job control job ID that identifies a background process group to be waited for. The job control job ID notation is applicable only for invocations of wait in the current shell execution environment, and only on systems supporting the job control option. USAGE
On most implementations, wait is a shell built-in. If it is called in a subshell or separate utility execution environment, such as one of the following, (wait) nohup wait ... find . -exec wait ... ; it will return immediately because there will be no known process IDs to wait for in those environments. EXAMPLES
Example 1: Using A Script To Identify The Termination Signal Although the exact value used when a process is terminated by a signal is unspecified, if it is known that a signal terminated a process, a script can still reliably figure out which signal is using kill, as shown by the following (/bin/ksh and /usr/xpg4/bin/sh): sleep 1000& pid=$! kill -kill $pid wait $pid echo $pid was terminated by a SIG$(kill -l $(($?-128))) signal. Example 2: Returning The Exit Status Of A Process If the following sequence of commands is run in less than 31 seconds (/bin/ksh and /usr/xpg4/bin/sh): sleep 257 | sleep 31 & jobs -l %% then either of the following commands will return the exit status of the second sleep in the pipeline: wait <pid of sleep 31> wait %% ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of wait: LANG, LC_ALL, LC_CTYPE, LC_MES- SAGES, and NLSPATH. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), jobs(1), ksh(1), sh(1), attributes(5), environ(5), standards(5) SunOS 5.10 12 Dec 1997 wait(1)

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