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Swap 95%+ , but a lot of free ram memory

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http://serverfault.com – I am running centos 5.8 with cpanel. Lately I am getting reports that my swap is full , but there is a lot of free memory to use. top - 10:33:43 up 133 days, 17:00, 1 user, load average: 0.05, 0.03, 0.05 Tasks: 170 total, 1 running, 169 sleeping, 0 stopped, 0 zombie Cpu(s): 2.1%us, 0.5%sy, 0.0%ni, 97.2%id, 0.0%wa, 0.0%hi, 0.2%si, 0.0%st Mem: 24726100k total, 8255368k used, 16470732k free, 599560k buffers Swap: 1046520k total, 984740k used, 61780k free, 3641828k cached How do I solve this? The unused ram memory should be used instead of the swap. Or shoul (HowTos)

grtyyu's picture
Submitted by grtyyu on 04/08/2012

Stories similar to Swap 95%+ , but a lot of free ram memory

The following three outputs were taken essentially simultaneously:

top:

top - 02:54:36 up 2 days, 13:50, 3 users, load average: 0.05, 0.05, 0.09 Tasks: 181 total, 1 running, 179 sleeping, 0 stopped, 1 zombie %Cpu(s): 2.5 us, 0.8 sy, 0.0 ni, 96.6 id, 0.1 wa, 0.0 hi, 0.0 si, 0.0 st KiB Mem: 16158632 total, 11234480 used, 4924152 free, 844 buffers KiB Swap: 16777212 total,

can anyone tell me where the memory is gone: (no, this time neither buffers nor cache)

# free total used free shared buffers cached Mem: 3928200 3868560 59640 0 2888 92924 -/+ buffers/cache: 3772748 155452 Swap: 4192956 226352 3966604

top, sorted by memory, descending:

top - 13:42:06 up 1 day, 3:47, 2 u

I've read a number of top memory use questions but I don't think they answer this.

Here's the most significant part of a top run:

top - 01:11:41 up 4 days, 1:06, 3 users, load average: 0.00, 0.03, 0.26 Tasks: 86 total, 1 running, 84 sleeping, 0 stopped, 1 zombie Cpu(s): 0.4%us, 0.4%sy, 0.0%ni, 99.2%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 1022816k total, 986704k used, 361

Can you help me understand what is taking memory on my linux box?

When I run free command I see the following picture (14GB are used, 10GB are free):

total used free shared buffers cached Mem: 24724636 14428580 10296056 0 699100 7763272 -/+ buffers/cache: 5966208 18758428 Swap: 26836984 20776 26816208

But when I run t

I've noticed high memory usage on the server. Details:

OS: CentOS 6.3 - x86_64

Web server: Nginx with PHP-FPM

The server is generating PDF documents so the traffic is minimum.

top:

# top -b -n 1 -a top - 10:04:51 up 21 days, 18:57, 1 user, load average: 0.00, 0.00, 0.00 Tasks: 92 total, 1 running, 91 sleeping, 0 stopped, 0 zombie Cpu(s): 0.3%us, 0.2%sy, 0.0%ni, 99.6%id, 0.0%wa,

I have a desktop running Ubuntu Quantal using OpenStack Folsom on an Intel i5 with 32 GB RAM and 2 GB swap. I'm running 7 VMs each sized like a EC2 m1.small, so 1.7 GB RAM each.

on my linux system I get these stats from top:

Tasks: 155 total, 1 running, 153 sleeping, 0 stopped, 1 zombie Cpu(s): 1.5%us, 0.3%sy, 0.0%ni, 97.4%id, 0.7%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 8177180k total, 2025504k used, 6151676k free, 44176k buffers Swap: 7999996k total, 495300k used, 7504696k free, 637612k cached

There it shows me that my system is using 495Mb of swap.

A few days ago my linux apache server ran out of memory. The server is a xen guest. The server killed all my processes except ssh.

A minute before it ran out of memory, a script of mine saved the output of various commands.

Sometimes I find that 100% of my small Debian machine's RAM is used, but I can't figure out how to find this leak: top show that all memory is used, but I can't find any process that consumed this memory in process listing (processes sorted by field 'n' - %MEM):

top - 12:50:41 up 8 days, 1:13, 1 user, load average: 0.06, 0.15, 1.63 Tasks: 101 total, 1 running, 100 sleeping, 0 stopped, 0