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Full Discussion: Determine uniqueness of pid to name output files
Top Forums UNIX for Dummies Questions & Answers Determine uniqueness of pid to name output files Post 302796029 by hanson44 on Thursday 18th of April 2013 06:40:07 PM
Old 04-18-2013
Yes, as you concluded, a pid is NOT unique within a 24 hour period. My understanding is they reach a maximum value, go back to lowest open value, and then start increasing again, reusing open slots are available.

Yes, the addition of "date +%Y%m%d_%H%M%S" to the file name will make the file name unique. That seems like a very good way, probably the best way.
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LEARN ABOUT REDHAT

sadc

SADC(8) 							Linux User's Manual							   SADC(8)

NAME

       sadc - System activity data collector.

SYNOPSIS

       /usr/lib/sa/sadc [ -I ] [ -V ] [ -x pid ] [ -X pid ] [ interval [ count ] ] [ outfile ]

DESCRIPTION

       The  sadc  command  samples  system data a specified number of times ( count ) at a specified interval measured in seconds ( interval ). It
       writes in binary format to the specified outfile or to the standard output. If outfile is set to -, then  sadc  uses  the  standard  system
       activity  daily	data  file,  the /var/log/sa/sadd file, where the dd parameter indicates the current day.  When the count parameter is not
       specified, sadc writes its data endlessly.  When both interval and count are not specified, a dummy record, which is used at system startup
       to  mark  the  time when the counter restarts from 0, will be written.  For example, one of the system startup script may write the restart
       mark to the daily data file by the command entry:

       /usr/lib/sa/sadc -

       The sadc command is intended to be used as a backend to the sar command.

       Note: The sadc command reports only local activity.

OPTIONS

       -I     Tell sadc to report statistics for all system interrupts. By default, sadc only reports statistics for the total	number	of  inter-
	      rupts.

       -V     Print version number and usage then exit.

       -x pid Tell sadc to report statistics for the process whose PID is pid.

       -X pid Tell  sadc to report statistics for the child processes of the process whose PID is pid.	The SELF keyword indicates that statistics
	      are to be reported for the child processes of the sadc process itself.

EXAMPLES

       /usr/lib/sa/sadc 1 10 /tmp/datafile
	      Write 10 records of one second intervals to the /tmp/datafile binary file.

BUGS

       /proc filesystem must be mounted for the sadc command to work.

       All the statistics are not necessarily available, depending on the kernel version used.

FILES

       /var/log/sa/sadd
	      Indicate the daily data file, where the dd parameter is a number representing the day of the month.

       /proc contains various files with system statistics.

AUTHOR

       Sebastien Godard <sebastien.godard@wanadoo.fr>

SEE ALSO

       sar(1), sa1(8), sa2(8), mpstat(1), iostat(1), vmstat(8)

       http://perso.wanadoo.fr/sebastien.godard/

Linux								   DECEMBER 1999							   SADC(8)
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