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Full Discussion: Grep causing long delay (batching) whilst piping
Top Forums Shell Programming and Scripting Grep causing long delay (batching) whilst piping Post 302211393 by spudtheimpaler on Thursday 3rd of July 2008 08:33:38 AM
Old 07-03-2008
Bug
Quote:
Originally Posted by ghostdog74
why do you need to do things in separate scripts? do your processing in the while loop itself. Its just a program design problem.
Because:

the actual 'input' script outputs something like

Quote:
timestamp process_name pid memory_usage cpu_usage
13:00:00 proc1 1000 500M 50%
13:00:00 proc2 1001 500M 10%
13:00:00 proc3 1002 256M 13%
13:00:01 proc1 1000 500M 50%
13:00:01 proc2 1001 500M 10%
13:00:01 proc3 1002 256M 13%
13:00:02 proc1 1000 500M 50%
13:00:02 proc2 1001 500M 10%
13:00:02 proc3 1002 256M 13%
which is primarily for logging purposes. The 'output' script was going to attempt to take the processes as they were output, and display running averages. As there are, in reality, many processes this will monitor and you would only need to actively monitor one t a time, I used a simple grep on it, which is when i noticed the issue.

Can I work around it? Sure. I can log to a file and tail that, for example, but I'm more curious as to why this is happening. This is less of a 'I have a problem and need a workaround' and more of a 'this is unexpected behaviour, does anyone have an explanation?' kind of query.

Cheers,
Mitch.
 

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LEARN ABOUT DEBIAN

pam_faildelay

PAM_FAILDELAY(8)						 Linux-PAM Manual						  PAM_FAILDELAY(8)

NAME

       pam_faildelay - Change the delay on failure per-application

SYNOPSIS

       pam_faildelay.so [debug] [delay=microseconds]

DESCRIPTION

       pam_faildelay is a PAM module that can be used to set the delay on failure per-application.

       If no delay is given, pam_faildelay will use the value of FAIL_DELAY from /etc/login.defs.

OPTIONS

       debug
	   Turns on debugging messages sent to syslog.

       delay=N
	   Set the delay on failure to N microseconds.

MODULE TYPES PROVIDED

       Only the auth module type is provided.

RETURN VALUES

       PAM_IGNORE
	   Delay was successful adjusted.

       PAM_SYSTEM_ERR
	   The specified delay was not valid.

EXAMPLES

       The following example will set the delay on failure to 10 seconds:

	   auth  optional  pam_faildelay.so  delay=10000000

SEE ALSO

       pam_fail_delay(3), pam.conf(5), pam.d(5), pam(7)

AUTHOR

       pam_faildelay was written by Darren Tucker <dtucker@zip.com.au>.

Linux-PAM Manual						    06/04/2011							  PAM_FAILDELAY(8)
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