Re: [PLUG] Troubleshooting mem-suck

[Rich Freeman <r-plug@thefreemanclan.net>]

On Dec 4, 2011 12:51 PM, "Paul Walker" <starsinmypockets@gmail.com> wrote:
>
> Hmm.. I'm experiencing a lot of latency on my server. running `top` shows really high memory usage, but I'm unable to determine from the line items what process(es) are responsible for the suck... Does this make sense to any of you? 
>
> Tasks:  88 total,   1 running,  87 sleeping,   0 stopped,   0 zombie
> Cpu(s):  0.0%us,  0.0%sy,  0.0%ni,100.0%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
> Mem:    768848k total,   651552k used,   117296k free,     9340k buffers
> Swap:   524284k total,    23976k used,   500308k free,   428872k cached
>

This suggests that you only have 769M of RAM, of which 117+9+429M is available for use. Only 23M is swapped - probably because is hasn't been touched much.

Doesn't really seem RAM-constrained to me (well, not until you try to run a desktop app written in the last decade, anyway).

Try using atop if you have accounting enabled in your kernel. It shows you ten second slices and everything happening in them. That picks up stuff that runs for 10ms and dies. Plus it gives a lot more IO info.

Rich

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