linuxnetworkingtraffic
From time to time connection to my server is very slow. This could be that someone is doing large uploads or downloads. Since I have a lot of software on my server I would like to find out, which process is responsible for the traffic.
Is there a simple command which lists processes which are currently doing network communication, sorted by the amout of traffic that was created in the last x seconds?
My system is running Ubuntu.
I'm sure there's a way to better interpret the info coming from your ISA server, but in case everything fails: "In wireshark we trust"
It runs on Windows too: http://www.wireshark.org/download.html
Ah, I see you have mistaken how to calculate free RAM in Linux.
Linux tends to heavily utilize all the RAM by caching stuff. Instead of reading directory listing from the disk every time, it caches the directory entries in RAM. It caches the frequently used files, so they don't need to be loaded from the disk every time. In case some process actually needs the RAM for its use, the cache will be immediately evicted.
So the formula for calculating the actually used RAM is total - (free + buffers + cached), in your case 3988 - (219 + 165 + 1894) or in other words 3988 - 2278. That is 1710 megabytes of RAM in use and 2278 megabytes of RAM for you still to consume.
Don't believe me? See, your server doesn't even have any swap in use. :)
But of course, a machine crash -- if you mean a hard lock up -- is a strange thing. That really should not happen. I suspect a faulty RAM stick which only gets accessed in case of >2 GB of RAM in use.
Best Answer
You could use this post on AskUbuntu
This post explain installing and using iftop.