Need help for an autorestart script

[thegeek]

Hello all,

We have a few critical processes that need to be up 24/7.

Sometimes these processes hang and I get a call in the middle of the night to connect to the server and restart the process (which is stupid).

I need a monitoring script to check the health of these processes and once it detects a process to be hung or not responding to kill and restart the process.

Is this doable with Autoit?

Any help is appreciated.

Thanks...

[jchd]

It's quite possible i could be done but it depends on a number of factors.

First, do the monitored processes provide a reliable way to determine if they're hung? Something innocuous, like the equivalent of a ping.

EDIT:

Sorry I didn't notice: welcome to the AutoIt forum!

Edited February 15, 2010 by jchd

[NerdFencer]

If there is some reliable way to "ping" the process as mentioned by jchd, you can use "ProcessClose" to terminate it and "ShellExecute" or "Run" to start it back up (Check documentation to see how to call these functions). If these processes need administrative rights, then add "#RequireAdmin" to the top of your script, and use "ShellExecute" not "Run" because "ShellExecute" preserves application rights and "Run" does not.

[JohnOne]

Never used it but perhaps ProcessGetStats() would help you in determining if the process has hung.

[thegeek]

Thanks jchd.

I guess I need to first understand what "hung" means in OS terms.

When the process is hung it is still running according to task manager, but it is not processing what it should.

Thanks again for your help guys...

[NerdFencer]

often times when a process hangs its cpu use drops to near 0 or peaks to maximum for extended periods of time

[JohnOne]

If you use ProcessGetStats() on the process when its running fine (test a few times) then try again when its hung then you will most likely see some noticable differends in 1 or more od the array elements.

Hopefully from that you will be able to have your script check it intermittently and restart it if conditions are met.

[thegeek]

Would you guys happen to have some example scripts to get me started?

[jchd]

I guess I need to first understand what "hung" means in OS terms.

When the process is hung it is still running according to task manager, but it is not processing what it should.

Then this is this buggy process that needs attention, not a doubtful way to possibly catch an undefined internal state, which this "critical 24/7" process should _never_ be allowed to reach.

I'd like my grandfather to wear a heart monitor, calling for rescue in case he gets a heart attack.

Geez, take him to a heart specialist in the first place!

[thegeek]

Thanks to all of you guys.

This is the script that I have so far:

$title = "process_name"
$text = ""
$hWnd = WinGetHandle($title, $text)
If $hWnd == "" Then Exit
$retArr = DllCall("user32.dll", "int", "IsHungAppWindow", "hwnd", $hWnd)
If $retArr[0] Then ProcessClose(WinGetProcess($title, $text))
Exit

Now all I have to do is to create a time loop to check the process every 10 minutes.

What do you guys think?

[jchd]

It's cool that this works for you but nonetheless the mere need to routinely check such abnormal condition reflects a deeper problem which isn't going to fade away if noone cares. Sounds pretty fragile for a mission critical application. I don't mean to blame you since I guess this isn't your responsability.