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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 CENTOS

ocf_heartbeat_delay

OCF_HEARTBEAT_DELAY(7)						OCF resource agents					    OCF_HEARTBEAT_DELAY(7)

NAME

       ocf_heartbeat_Delay - Waits for a defined timespan

SYNOPSIS

       Delay [start | stop | status | monitor | meta-data | validate-all]

DESCRIPTION

       This script is a test resource for introducing delay.

SUPPORTED PARAMETERS

       startdelay
	   How long in seconds to delay on start operation.

	   (optional, integer, default 30)

       stopdelay
	   How long in seconds to delay on stop operation. Defaults to "startdelay" if unspecified.

	   (optional, integer, default 30)

       mondelay
	   How long in seconds to delay on monitor operation. Defaults to "startdelay" if unspecified.

	   (optional, integer, default 30)

SUPPORTED ACTIONS

       This resource agent supports the following actions (operations):

       start
	   Starts the resource. Suggested minimum timeout: 30.

       stop
	   Stops the resource. Suggested minimum timeout: 30.

       status
	   Performs a status check. Suggested minimum timeout: 30. Suggested interval: 10.

       monitor
	   Performs a detailed status check. Suggested minimum timeout: 30. Suggested interval: 10.

       meta-data
	   Retrieves resource agent metadata (internal use only). Suggested minimum timeout: 5.

       validate-all
	   Performs a validation of the resource configuration. Suggested minimum timeout: 5.

EXAMPLE

       The following is an example configuration for a Delay resource using the crm(8) shell:

	   primitive p_Delay ocf:heartbeat:Delay 
	     op monitor depth="0" timeout="30" interval="10"

SEE ALSO

       http://www.linux-ha.org/wiki/Delay_(resource_agent)

AUTHOR

       Linux-HA contributors (see the resource agent source for information about individual authors)

resource-agents UNKNOWN 					    06/09/2014						    OCF_HEARTBEAT_DELAY(7)
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