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Martin Hope
Steve Bennett
Asked: 2012-01-23 22:07:23 +0800 CST
  • 7

I've recently had an experience of writing a shell script which crashed a server (and damaged a partition) by consuming all resources. It was hooked up to a cron job, and it seems it took longer to run than the interval between executions, over time snowballing out of control.

Now, I've since modified it to record its running state, and to not run more than once simultaneously. My question is: are there other, simple ways to safeguard a script against causing harm? Is there a standard list of things a script should do to behave properly, not consume too many resources, to fail gracefully, alert the right people, etc?

Basically: what other pitfalls should I avoid?

scripting bash resources process
Martin Hope
jayarjo
Asked: 2011-04-10 10:43:35 +0800 CST
  • 17

I have server which runs liquidsoap+icecast bundle and simple website (httpd+mysqld). Nothing special. Visitors around 2000+ per day, with around 50 being online simultaneously on average.

Server has 8GB RAM. As the time goes by, amount of free memory constantly decreases, although nothing new is started on server and there are no new users. At some point it starts to swap, load on server goes up and it becomes unresponsive. Usually what I do is just restart the server...

What can be done to detect what exactly leaks memory? I use top to monitor usage of resources, but as far as I see it shows nothing helpful:

enter image description here

Is there any way to find out what uses that much memory? or what starts to swap to disk heavily? Any way to free up memory without rebooting the server?

linux resources top memory-usage memory-leak
Martin Hope
Alex
Asked: 2009-09-04 03:55:29 +0800 CST
  • 5

How to find out what process is using CPU to what extent in Ubuntu? I'd like to have real-time data as well as recorded history. Both console and GUI apps would be great.

The situation is that my system seems to be really overloaded right now and I don't know why for sure. I've spent some time killing processes and watching if performance improves. And I suspect that JS Scripts running in Mozilla are causing problems. All in all a nice tool for taking a look at CPU usage would come in handy.

central-processing-unit linux ubuntu monitoring resources
Martin Hope
Luke Quinane
Asked: 2009-05-22 15:35:44 +0800 CST
  • 4

Where is the best place to find out information about blue screen of death 'STOP' and other error codes? Technet has a list but it doesn't seem to have the STOP code that I've seen:

STOP 0x000000F4 (0x0000000000000003, 0xFFFFFA8070EFFC10,
                 0xFFFFFA8070EFFE48, 0xFFFFF800002108530)

I'm really after general resources on BSODs. Also is there any information on what the other values are?

bsod resources