Linux divides its physical RAM (random access memory) into chucks of memory called pages. Swapping is the process whereby a page of memory is copied to the preconfigured space on the hard disk, called swap space, to free up that page of memory. The combined sizes of the physical memory(RAM) and the ...

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4
votes
2answers
94 views

Swap being used when RAM is almost half free

Today I noticed that I found the following thing: As you can see the RAM is almost half-free and the usage of swap space is very high. From my textbook knowledge, I used to think that Linux OS ...
2
votes
1answer
31 views

How do you know when server memory needs to be increased?

I have a VPS running a few websites for clients. Running free -h shows the following: ~$ free -h total used free shared buffers cached Mem: 994M ...
0
votes
0answers
9 views

Using instance storage for swap on Redhat 5 running in AWS?

I'm running a Redhat 5.11 server in AWS. I can configure swap to use instance storage (/dev/sdc), but every time the server restarts I have to reconfigure the swap. Adding an entry to fstab doesn't ...
1
vote
0answers
23 views

Ubuntu 14.04 using 100% SWAP with more than 40GB free memory [migrated]

I'm a bit at a loss trying to figure out why this would be the case. Can anyone provide some helpful ideas on troubleshooting this? free -m total used free shared ...
0
votes
1answer
24 views

Trouble with SWAP on AWS

I created an AWS m3.large instance. It comes with a single 32GB SSD. During the creation process, I added a second drive for the system. I picked the second drive for the system: xvda1 and the ...
1
vote
3answers
81 views

Best way to disable swap in linux

I am running a custom compiled 3.18.9 kernel and I am wondering about the best way to disable swap on the system. I also use init if it makes a difference. Is it enough to comment or remove the swap ...
1
vote
0answers
47 views

(mysqld), uid 88 inumber 281675 on /: filesystem full

I created a swap file that was a little to big. So I deleted it. The swap file is gone, but the free space is never reallocated. I have rebooted, fdisk is no help, not sure where to go from here. The ...
1
vote
1answer
38 views

Forcing a user to use swap space after certain memory usage (using limits.conf?)

I have a backend app that is being used internally by developers hosted on our server, however, the app unfortunately requires the use of Passenger and Ruby, both of which are very memory-hungry. I ...
0
votes
0answers
75 views

Docker memory swap account broken in ubuntu 14.04.2

I'm using ubuntu 14.04.2 . I saw that recently swap support was broken, maybe with a recent kernel upgrade? On a fresh install: cat /etc/default/grub: ...
1
vote
0answers
51 views

How to copy locked swap files in ESXi?

Based on this question : How to disable swap files in ESXi?. The main answer states that it is possible to extract data from the swap files (for exemple using strings) so I tried to make a simple ...
-3
votes
1answer
47 views

Does swap on 32-bit OS with 4 GB make sense? [closed]

Does having swap space makes sense if I have a 32 bit OS (Linux) and 4 GB RAM already? As it would have to be addressable with a 32 bit address, which are already all "used up" by the RAM, would ...
0
votes
0answers
104 views

understand FreeBSD vmstat output about meory

My Dell PowerEdge server has 24GB memory and 6GB swap. It has some VirtualBox vms (virtual machines), one vm is assigned 10GB memory and no swap. Right now the vm is slow, the vm's vmstat output is: ...
0
votes
1answer
60 views

Get rid of \040(deleted) swap

By mistake one of our admin on a production machine, deleted the swap file from the system. Without swapping it off. Now we are getting this. /swapfile3\040(deleted) file ...
0
votes
1answer
93 views

Solaris: how to list swap space per process?

On Solaris, how can I find out how much swap space a given process is occupying? Or even better, how can I list all running processes sorted by swap space usage? I'm asking this particulary for ...
0
votes
3answers
113 views

Why wouldn't I want to enable swap?

I recently had an issue where a rogue process caused some ec2 instances to run out of memory and crash. It probably shouldn't have been an issue, except I was using t2.small instances which are pretty ...
1
vote
0answers
43 views

make linux kernel read swap back into memory [closed]

Occasionally, I run a script that uses the majority of the 16GB of physical memory on my workstation. The kernel then swaps out the rest to swap partitions on multiple disks. After the script is ...
1
vote
1answer
75 views

How do I increase the swap size on a xen guest machine using xm?

I'm attempting to increase the amount of swap on a xen guest machine. At first I thought it'd be similar to increasing the hard drive space, which I do like this: cd /srv/xen/domains/$host/ xm ...
1
vote
1answer
69 views

Swap 99% but regular memory fine

I have a 1GB VPS server. I setup 1GB of swap ram too a few weeks ago and quite often it's hitting 99% whilst the regular memory is usually 40% - 60%. Most of my sites on the server run fine and fast. ...
0
votes
1answer
140 views

how to swap VM disks in azure?

I've have recreated a virtual machine in azure, when I did it azure assigned an OS disk to the VM which is normal and obvious, and I have a disk from my previous virtual machine. for now I got two ...
1
vote
1answer
543 views

Ubuntu Server 14.04LTS Swappiness for server with 16GB memory

(don't worry I'm not asking what my setting should be, asking for the theory behind some conflicting advice I've read) My application is one that is lightweight and not under much load, but needs to ...
0
votes
1answer
75 views

Run app only in swap [closed]

I've a very low priority level program who consume large of memory. I need to free RAM for other programs. My objective is to kill -STOP <pid> this process and ```kill -CONT when i need it. But ...
-1
votes
1answer
78 views

Swapfile on SSD and Memory Speed Comparison [closed]

I'm running Ubuntu on Digitalocean's instance that using ssd as their disk, and I'm using swapfile to help memory does the job. What I wanna know is, how can we compare speed between ram and the ...
1
vote
0answers
47 views

Why is my server using swap even though there is lots of RAM available? [duplicate]

My server has 24 cores, 16 GB RAM, and 8 SSDs on raid 0 (I think). I've noticed it is now using a low of swap space, even though there is plenty of RAM available. load average: 2.70, 2.54, 2.50 Mem: ...
0
votes
1answer
220 views

How to enable swap with salt stack?

How can I create and enable permanent 1GB swap file with salt stack that will work after reboot? salt.states.mount.swap does not allow to define swap size. Furthermore I need to define swappiness. ...
0
votes
2answers
116 views

plenty of ram but still swapping

this is graph of my server ram you can see in graph that every time I restart mysqld, swap becomes zero. But increases over time. If i put innodb buffer pool in large size swap rises faster and if I ...
5
votes
1answer
445 views

BIND 9.10 constantly killed on FreeBSD 10.0 with out of swap space

In one of our slave DNS servers BIND, version bind910-9.10.0P2_3, constantly get killed with the following message in /var/log/messages: Jul 30 01:00:10 cinnabar kernel: pid 602 (named), uid 53, was ...
5
votes
3answers
4k views

How to increase swap space on a live server [duplicate]

On Ubuntu 14.04, the swap file has to be increased as the memory and swap usage are reaching 100% usage. On a live production server, can the swap be increased with minimal disruption to the service? ...
2
votes
2answers
237 views

Swap memory exhausting server even site has small visitors

I have CentOs 6.5 running on a 32bit VPS host. It is running only php-fpm, nginx, and mysql. I have a site that gets on average 20 visitors per day, but I am recently getting this message from my ...
-1
votes
1answer
3k views

puppet logical conditions- “onlyif” and “unless” not working

I have written the following code and this works fine if swap is not in place, but once swap is created and if the script is executed again, it leads to error. I tried adding conditions using onlyif ...
0
votes
0answers
245 views

swapoff running forever on LVM volume

I'm currently trying to resize my swapspace on a Proxmox VE server with LVM volumes, as I'm running out of space for LVM snapshots and the swapspace is fairly oversized: root@rb-srv-gus:~# free -m ...
0
votes
1answer
198 views

lvresize: command not found - RedHat

No search results on google for this. So i am really confused now. I am trying to increase the swap space and lvresize says command not found. Please Help !! using RedHat 64bit
-3
votes
1answer
161 views

Improve LAMP performance Ubuntu 12.0.4 [closed]

cpu 1.3% mem 476/490MB swap 347/511mb tasks: 43, 29 thr; 1 running load average: 0.10 0.08 0.06 via htop:<br> /usr/sbin/apache2 -k start (listed 8x @ 8.1% mem each) /usr/sbin/mysqld (listed ...
2
votes
0answers
191 views

Linux (Debian 7 x64) swapping activity despite lots of free memory

Yes, I have reduced vm.swappiness a lot: % sysctl -a | grep swap vm.swappiness = 1 Memory is mostly free: % cat /proc/meminfo | head MemTotal: 8070592 kB MemFree: 2619580 kB ...
1
vote
2answers
81 views

Why is my server swapping at all?

Munin shows ram that is doing nothing most of the time. But swapping still happens. Quite regularly actually, bogging down the hdd. Or am I seeing the ram graph in the wrong way? How would I go ...
-1
votes
3answers
104 views

Linux makes cache for swap. what for?

It looks like joke: swapfile on "ramdysk" in 64bits system? I look into file: /proc/meminfo and made some investigation. Look for line: SwapCached: nnnnn kB . One is what I don't understand. ...
0
votes
3answers
1k views

Is there any reason to NOT have a swap file on CentOS (DigitalOcean)

I'm running a site on DigitalOcean with CentOS 6.5. As has been noted elsewhere, DigitalOcean servers are by default configured without any sort of swap, and I'm wondering if I should add one. I ...
0
votes
1answer
191 views

Debian 6 - Linux 2.6.32-5-amd64 - Samba server with 32GB swap - how should i reuse it?

today i have the mission to tuning a Debian samba file server, previously i never ever touched it. RAM = 16GB SWAP = 32GB first of i ran a parted -l and a free -h and i saw one 3TB hdd: /dev/sda ...
2
votes
1answer
221 views

My Ubuntu VPS is not using available swap, even if OOM. What to do?

I recently added 1 GB of swap to my Ubuntu virtual private server to prevent MySQL crashes on RAM overloading. I followed this tutorial. I use htop to monitor resources. When I use loadimpact to test ...
1
vote
1answer
343 views

Server failure in minutes due to high httpd-apache use (attack or bug)

In the last week suddenly I get errors for my server. I try to access my website I get 503 errors. When I check top and other things I see these: 60-65 httpd (apache) processes. (Normally I have ...
3
votes
2answers
302 views

How can I keep important VMs in memory without disabling swap?

VM Host -> Xenon E5-2440 w/ 48G mem... Everything runs CentOS6.5 (2.6.32-431) I have 4 guest VMs running each w/ 2G of memory. Their disk images are local files. The host machine is also running a ...
0
votes
1answer
139 views

OpenVZ vSwap Host Configuration

I wish to allocate vSwap memory to my OpenVZ containers. Where does OpenVz get the vSwap memory from? If the host were to run out of physical RAM, would the host start to use its own normal swap ...
0
votes
2answers
958 views

KVM under CentOS, swap exhausted, physical memory available

I've had a test CentOS KVM host running for about a week now with 3 CentOS guests. There's 12GB physical RAM with about 7.5GB actually allocated to VMs. These VMs aren't even being used yet as the ...
0
votes
2answers
73 views

Linux swap, linear write/read

i'm puzzled if linux writes and reads on swap sequentially . Now i'm analizyng pressure on swap partition and it's strange that utilisation is near 90% (util column in iostat ) but throughput is ...
0
votes
1answer
285 views

Why the system information message when accessing an Ubuntu server doesn't match free -m?

Each time I SSH into my AWS Ubuntu servers I see a system information message, showing load, memory usage and packages available to install, like this: Welcome to Ubuntu 12.04.3 LTS (GNU/Linux ...
0
votes
1answer
158 views

Transfer used ram to swap and free more physical ram

I have a vps with 256m physical ram and 512m swap space, I am trying to use a software that need more than 256m and less than 512m ram, so it uses swap. The problem is at some moment of the ...
10
votes
2answers
9k views

How to find what is using linux swap or what is in the swap?

I have virtual linux (Fedora 17) server with 28GB RAM and 2GB swap. The server is running mysql db that is set up to use most of the RAM. After some time running the server starts to use swap to swap ...
9
votes
2answers
5k views

Ubuntu Server hanging on adding swap

A fresh install of Ubuntu Server is refusing to boot and hanging on "Adding 524284k swap on /dev/mapper/test--vg-swap_1. Priority:-1 extents:1 across:524284k I can get around this by dropping onto ...
0
votes
1answer
103 views

SWAP reducing SSD write speed?

My SolusVM graphs have been showing 8Gb Swap usage even though the RAM is never over 50% used. Is it possible that virtual machines going into swap will reduce the IO of the SSD?
8
votes
1answer
1k views

Background discard on swap partitions on Linux + SSD

Problem I want to enable background TRIM operations on a swap partition within a SSD disk on Linux. According to several articles, e.g. this one, the kernel detects this configuration and ...
0
votes
2answers
472 views

Moving a process to and from swap [closed]

I've got serveral processes (game servers) on my linux server that use up 50MB of RAM. They are not constantly being used, and I'd like to be able to run more instances than my RAM capacity allows. I ...