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Full Discussion: multiple processes overlap
Top Forums Shell Programming and Scripting multiple processes overlap Post 302274433 by stonemonolith on Wednesday 7th of January 2009 02:38:54 PM
Old 01-07-2009
multiple processes overlap
Hello

I've got a script that creates multiple processes, in ksh, to bcp out 6 tables at a time. In the script, we write messages to the log to show our progress; most of the time, the log messages are nice and neat with one per line, like they should be. But every once in awhile, at random, the messages will "overlap" each other, and I can't see why. I tried putting a sleep 1 just before we write to the log file, but the log messages still overlap.

Here is a small portion of the log file:
________________________________________________
01/07 13:37 CER_PZME_MENU_ENT..chgenv01 - bcp out started
01/07 13:37 CER_PZMG_MENU_GRP..chgenv01 - bcp out finished successfully
01/07 13:37 CER_PZCI_C0L1I/E0N7T 1_3U:.3.7c ChEgRe_nPvZ0A1P -_ bAcPpP o.u.tc fhigneinsvh0e1d - s buccpc oeusts ffiunlilsyhed successf
ully
01/07 13:37 CER_PZME_MENU_ENT..chgenv01 - bcp out finished successfully
01/07 13:37 CER_PZCO_VALRLSE..chgenv01 - bcp out finished successfully
...
...
01/07 13:39 NWX_NSCT_SCHD_TYPE..chgenv01 - bcp out finished successfully
01/07 13:39 NWX_NSCV_SCH_VALUE..chgenv01 - bcp out fini0s1h/e0d7 s 1u3c:c3e9s NsWfXu_lNlSyHC_SCHEDUL
ES..chgenv01 - bcp out finished successfully

____________________________________________________

and here is a little bit of the code that we use. The echo statement at the bottom is what is being written to the log; I can't see why this "overlap" problem is random, and doesn't effect all the messages.
_____________________________________________________
bcp_with_error_check $dbname..$stbl out $sfile_main -$mode -b10000 -A8192 -e$sfile_error -U$suser -S$senvname -P$spass > /dev/null
# Write to the log the table date/time -- completed
sleep 1
echo `date +"%m/%d %H:%M"` $strTableName..$dbname - bcp out finished successfully

_____________________________________________________
Any help would be appreciated. tia
 

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LEARN ABOUT DEBIAN

cgrulesengd

CGRULESENGD(8)							 libcgroup Manual						    CGRULESENGD(8)

NAME

       cgrulesengd - control group rules daemon

SYNOPSIS

       cgrulesengd [options]

DESCRIPTION

       cgrulesengd  is	a  daemon,  which  distributes processes to control groups. When any process changes its effective UID or GID, cgrulesengd
       inspects the list of rules loaded from the cgrules.conf file and moves the process to the appropriate control group.

       The list of rules is read during the daemon startup is are cached in the daemon's memory.  The daemon reloads the list  of  rules  when	it
       receives SIGUSR2 signal.

       The daemon opens a standard unix socket to receive 'sticky' requests from cgexec.

OPTIONS

       -h|--help
	      Display help.

       -f <path>|--logfile=<path>
	      Write  log  messages to the given log file. When '-' is used as <path>, log messages are written to the standard output. If '-f' and
	      '-s' are used together, the logs are sent to both destinations.

       -s[facility]|--syslog=[facility]
	      Write log messages to syslog. The default facility is DAEMON. If '-f' and '-s' are used together, the logs are sent to both destina-
	      tions.

       -n|--nodaemon
	      Don't fork the daemon, stay in the foreground.

       -v|--verbose
	      Display more log messages. This option can be used twice to enable more verbose log messages.

       -q|--quiet
	      Display less log messages. This option can be used twice to enable even less log messages and to only log errors.

       -Q|--nolog
	      Disable logging.

       -d|--debug
	      Equivalent to '-nvvf -', i.e. don't fork the daemon, display all log messages and write them to the standard output.

       -u <user>|--socket-user=<user>
	      -g  <group>|--socket-group=<group>  Set the owner of cgrulesengd socket. Assumes that cgexec runs with proper suid permissions so it
	      can write to the socket when cgexec --sticky is used.

FILES

       /etc/cgrules.conf
       the default libcgroup configuration file

SEE ALSO

       cgrules.conf (5)

Linux								    2009-02-18							    CGRULESENGD(8)
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