expert , alternative for sleep not use memory Post: 302562768

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Top Forums Shell Programming and Scripting expert , alternative for sleep not use memory Post 302562768 by pooyair on Saturday 8th of October 2011 07:06:04 AM

10-08-2011

Registered User

expert , alternative for sleep not use memory

Code:

while sleep 1; do
pgrep Polo || {
                  kill `pidof Polo` >/dev/null 
    
    /var/bin/polo_start.sh start &
    echo `date` R >> /var/log/Check_Polo .log
    }
done
exit 0

well , i use that script as a watchdog in my box (with has just 32 mb memory) which check every second if Polo binary is not running , it would start it. this works functionally right here.
but the problem is , it always use memory for sleep 1 command (since my box has a few memory and this watchdog is always running so it's really important for me to save memory of them ) as in top command always shows:

Code:

Command                                %MEM  
sleep 1                                4.7% 
[pgrep]                                 5 %

i need expert advice , how to change or improvw my script (esp those command) to would not use memory for sleep 1, ... or on the other words use least memory resources. would really appreciate any helps.

P.s : Linux 2.6.23.17_stm23_A21 #1 PREEMPT sh4 GNU/Linux
and pgrep , ... comes from busybox.
Best Regards.

Last edited by pooyair; 10-08-2011 at 08:23 AM..

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LEARN ABOUT NETBSD

acpilid

ACPILID(4)						   BSD Kernel Interfaces Manual 						ACPILID(4)

NAME

     acpilid -- ACPI Lid Switch

SYNOPSIS

     acpilid* at acpi?

DESCRIPTION

     The acpilid driver supports ACPI ``lid switches''.  The powerd(8) daemon can be used to control actions against the events of opening or
     closing the lid.  The script used is /etc/powerd/scripts/lid_switch, and the events are either pressed (the lid was closed) or released (the
     lid was opened).

EXAMPLES

     The following example modifies the mentioned script in order to put the system into (S3) sleep when the lid is closed:

	   ...

	   case "${2}" in
	   pressed)
		   logger -p info "${0}: suspending..."

		   # As in sleep_button, kill some daemons.
		   #
		   /etc/rc.d/dhcpcd stop
		   /etc/rc.d/network stop
		   /etc/rc.d/wpa_supplicant stop

		   # Suspend.
		   #
		   if /sbin/sysctl hw.acpi.sleep.state >/dev/null 2>&1; then
			   /sbin/sysctl -w hw.acpi.sleep.state=3
		   fi

		   # Waking up.
		   #
		   /etc/rc.d/wpa_supplicant start
		   /etc/rc.d/network start
		   /etc/rc.d/dhcpcd start

	   ...

SEE ALSO

     acpi(4), powerd(8), sysmon_pswitch(9)

HISTORY

     The acpilid driver appeared in NetBSD 1.6.

BSD
								  January 9, 2011							       BSD