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I am working on Ubuntu 8.04.3 OS, with this I am getting a problem, Daily my server is down on same time at 4:00 PM
I seems server is down by "kswapd0" process, I am not sure,
As I run top command, I got below out put
I don't know much about servers, but the output above shows clearly that your memory and swap are completely full. And kswapd is the kernel swap daemon, which is probably just trying to deal with the lack of memory.
Well you're load avgs are extremely high, and, as noted, both your RAM and your swap partition are completely full.
You seem to have about 1.7Gb oRAM and 1GB swap (approx). I'd want swap at least as large as RAM on a server.
However, that won't solve your problem, you need look at what those processes are doing; probably start with Apache/PHP.