Swap space is an area of the hard disk that serves as an overflow when the computer memory is full. The memory used by inactive applications is partially written out to disk to make room for other applications and for the disk cache for active files.

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8G RAM and SSD - how big should the swap be?

I have a computer with 8G RAM and a 128G SSD. I don't plan hibernating. What swap size would you recommend? Would you change any swappiness? In the nearest future I'll compile programs (or even ...
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What happens when a tmpfs volume is full and swap is full? Is Linux's OOM-killer involved? [duplicate]

I understand that if a persistent / disk-based volume is full, files need to be explicitly deleted to free up space before more can be added. Further, I understand that if memory is exhausted, the ...
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206 views

Luks Partition Mounting After Removing From fstab

I have 3 encrypted partitions, one for /, one for /home, and one for swap. It seemed silly to me to type in my password 3 times, so I replaced the swap partition with a swap file on the encrypted ...
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2k views

Log from oom killer

I'm running a virtual machine at a provider where you pay for everything you use (CPU, memory, disk IO, bandwidth, etc). Currently my machine has 512MB ram and 1GB swap area. The kernel version is ...
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677 views

Java process, swap (/proc Solaris10) memory highly utilized

How can I analyze high swap memory utilization of Solaris 10 for Java processes?
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483 views

Is there an in-memory compressed swap facility (like Compcache) for FreeBSD?

Is there anything like CompCache for FreeBSD?
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131 views

How safe is it to increase tmpfs to more than physical memory?

My server has 2GB RAM and 120GB SSD, plus some RAID arrays for storage. OS is Debian 8 (Linux 3.16). I have a MySQL intense application that has tmpdir = /run/mysqld, which is a tmpfs configured by ...
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42 views

How to prevent swapping on Mac OS X?

I am inclined to run Tails through a virtual machine so that I could chain two VPNs. One running through the host Mac osx and one more running from inside the virtual machine that's running Tails. ...
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62 views

FreeBSD shared swap partition with Linux

What must I do, to run these commands before Arch Linux calls swapon -a? mkswap /dev/sdaX swapon /dev/sdaX Just in case it matters, /dev/sdaX was created in FreeBSD 10.1 environment, as soon as ...
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zram swap instability

I use Mint 13 Maya with mainline kernel 3.6.3 for Ubuntu Quantal on my Asus P53E Notebook. I use zram swap that comes with the package zram-config. I've noticed that using it the system to hangs at ...
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Out of Swap - What happens?

On my debian VM machine with 512MB RAM and 348MB Swap, what will happen if i open a 1GB file in an editor and get out of memory? Will it crash the system? Or if not, how will linux handle this? ...
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How to change swap partition from primary to logical?

I was installing Mint on dual boot with Win8 and I accidentally created primary swap partition. Is there any way I can change the partition type from primary to logical? Or do I have to delete those ...
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627 views

Can't add swap file on solaris

I'm trying to add a swap file on Solaris 10. I have already created a 2GB file swap.file. Then, I add a swap file with the command: swap -a /swap.file which shows an error: /swap.file: size is ...
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KVM and swap problem

So I have a problem, I'm managing a server and the swap partition is way too small at the moment. The machine runs KVM with about 24 VM's on it. The problem is that some of them are rather inactive so ...
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1answer
62 views

swapon command is not listing the lvm name

I am facing issues with swapon -s command. It is displaying some other filename instead of my lvm name which i have given ( swap is LVM partition ) swapon -s command is not listing my LVM Name for my ...
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Process Monitoring on Solaris

$ prstat -t NPROC USERNAME SWAP RSS MEMORY TIME CPU 164 oracle 5446M 5445M 8.3% 13:47:50 1.6% 52 root 576M 728M 1.1% 42:29:50 1.0% 1 noaccess 300M 273M 0.4% 0:20:54 0.0% ...
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Can linux systems on multiple virtual machines share the same swap partition? [duplicate]

I'm trying to save some disk space between multiple systems and re-using the same swap partition (which seems to be fine). I'm now getting into multiple virtual machines and am thinking of a ...
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2answers
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Is it a bad idea to not have a swap partition on an embedded linux setup?

I have a small embedded linux kernel and file system created via buildroot that is installed onto a compact flash drive running on an x86 board. I am using an initramfs (due to power loss concerns) ...
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Does mkswap check that a partition is a swap partition before formatting it?

I checked the man page for mkswap and was left confused whether mkswap tests whether a partition is of type 82 before formatting it. Background: I am using Ubuntu 11.04, and I had just set up my swap ...
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How does mkswap work? What is in the swap header it creates?

I am looking at mkswap and trying to understand how exactly it works. From what I understand, it sets up Swap space on a partition by creating a swap header. How large is this swap header? Is it one ...
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2answers
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Diagnose high swap usage on AIX

Which would be the best approach to diagnose high SWAP usage on an IBM AIX 6.3 machine? I've already tried with lsps -a and lslv. But also I'm looking for a strong scenario, like using topas. Any ...
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1answer
373 views

What happens when a tmpfs is full and no swap space is available?

Let's say I have a setup with 16 GB of physical RAM, A tmpfs of max. 8 GB containing a file with 5 GB and A swap sized 4 GB. If I'd try to, e.g., create a copy of the 5 GB file on the tmpfs, what ...
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KVM and Swap space

suppose the following scenario: a host with 2 GiB runs a few guests using KVM. Each guest does usually not need much memory, they are given 256 MiB each and run services that mostly twiddle their ...
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Why my partitions don't show the right capacity on a 4096 byte physical block hard drive?

After reading a lot about why newer 4096 byte physical block hard drives should be partitioned taking care of alignment (Linux on 4KB-sector disks: Practical advice, What is partition alignment and ...
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How to reuse Physical memory in the absence of swapping?

How can I reuse physical memory in the absence of swapping?
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1answer
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Why is my computer sluggish after downloading a lot?

When I download a lot of data (e.g. 3GB) in one go, using a program such as Transmission or Wget, progressively during the downloading, and after it has has finished, the computer always seems ...
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Effects of SWAP failure

A team member has created a swapfile on one of our machines which needed more swap. And he created it on a filesystem on SSD. While our servers are not swapping a lot and probably safe to keep the ...
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Does the debian setup with lvm also encrypt the swap partition?

I'm planning a fresh debian install on my notebook and want to have full disk encryption. But I mainly hibernate, which is why I want my swap to be encrypted as well. During the graphical expert ...
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1answer
328 views

Why does mouse and keyboard freeze when Linux swaps

I have noticed that under Linux, when there is heavy swapping, the mouse cursor freezes, and even CapsLock or Ctrl+Alt+F1 don't work. The system uses the deadline I/O scheduler but this should not ...
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1answer
118 views

Why do I need mkswap if swap space has been created via fdisk?

I created a partition called /dev/sda3 as a swap partition, and changed the ID to 82 (Linux Swap) via fdisk. If this partition was recognized as a swap partition (seen in the output of fdisk -l and ...
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1answer
108 views

Can a VM swap to host main memory.?

While my developer machine has a lot of memory, my vmware VM is 32 bit only and needs some swap space. Can I make it to swap into the host memory? If so, is it possible to use compressed swap space ...
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132 views

Swap separation for multiple distributions [duplicate]

I have 3 Linux distributions on my machine (Ubuntu, Arch and Fedora). I allocated half the RAM size (3GB) as swap for each of them. (I have realized that having 3 distributions is not of much use to ...
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Can I remount as readonly if there's a swap image in use?

When am playing with my Android phone (CyanogenMod 10.1 with kernel 3.0.78), I found this: A script in /etc/init.d/99system.swap.sh It remount /system as rw, and creates an image file in ...
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Dual-booting Windows 7 and Mint 14 with “something else” option

I would like to do a dual boot of Windows 7 and Mint 14 on my Acer netbook which already has Windows 7 Pro 64-bit installed on an 1 TB hard drive. I have already shrunk the Windows 7 partition to ...
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1answer
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Linux as 3rd boot OS

I would like to install another linux kali beside my linux mint and win10. My question is, do I need make 3 partition again for installation, /root /home and swap od I don't need swap because I ...
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1answer
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Zeroing out FreeBSD swap space?

I'd like to zero-fill the partitions/slices in my FreeBSD VMs in order to provide for better compression for archival. For those partitions/slices with file systems the process is no problem for me to ...
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1answer
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Swap suddenly vanished from Debian?

Everything has been going fine for 6 months now until my swap suddenly vanished today. Now that I look into it, I find that my disk partitioning is a bit weird. What happened to it, and what should I ...
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Free up swap space all at once after swap event

I use my Linux box for a lot of computational work, and sometimes a particular computation eats a lot of RAM. When I'm done, I end up with a bunch of swap used and a bunch of free memory, and if I go ...
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Mysql / swap space full

I have MySQL Ver 14.12 Distrib 5.0.45 server running on Multiflex Intel Blade having 8G of RAM & 8 x Intel(R) Xeon(R) CPU E5410 @ 2.33GHz. The problems I am facing are: For the last 3-4 days ...
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Can't delete a swap partition, says that it's mounted while swapon says it's not?

I have a swap partition mounted on /dev/sda6 Linux Mint 17.2/Windows 10 dual boot. Am using HP 2000 notebook PC with 4GB RAM. When I installed Linux Mint I created a swap partition which as it happens ...
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Why adding swap space is the slowest part of the booting process? [closed]

I can see that adding Swap space is the slowest part of the booting process. Why? I actually have ~4GB for swap and 2GB RAM memory. dione@saturno:~$ dmesg | grep -C 4 swap [ 2.179979] input: ...
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Swap on video ram in a VM

I have a very small VM running in a cloud with only 512 MB ram. I read, it is possible to use the video card as swap as descriped here: Graphics cards contain a lot of very fast RAM, typically ...
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279 views

Linux-swap on reboot

I'm wondering what actually happens to a Linux-swap partition reboot. I've been taking a course in computer organization and while installing/partitioning a new drive I became rather curious about ...
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1answer
89 views

specific swap partitions for multiple debian instances in a single computer

I'm trying to setup a computer with three debian instances (wheezy, jessie and sid), I've created / and swap partitions for each debian instance, during the installation I did specify which swap ...
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1answer
2k views

Which processes swaps memory

I can see swap's total, used, free etc. sizes from top command. But I can't figure out which process uses swap, is it possible to find out swap memory by process? I'm running CentOS 6.3.
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How to disable swap file after install or during Kubuntu install?

My computer has more than 64KB of RAM (8GB), if I run out of memory I want things to crash so I know I'm out of RAM so I'll buy some instead of say wandering why my computer is running slowly when I ...
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Swap bash script pins htop's memory usage

I deployed a hack to add swap space to a VPS that otherwise didn't allow me to use swapon to create a file. Prior to adding and executing the script, I followed the steps outlined here. and ...
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RAM size and SWAP size

I want to know why the swap partition have to more double size the RAM Size ? for example if the ram installed in machine 64 G.B , the swap have to be 128 G.B ?
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kswapd0 takes 99% to 100% CPU in RHEL 6.3

I have 5 systems on which I have just installed RHEL6. System configuration is CPU-i7 HDD-500 GB RAM-2 GB Swap- 4 GB I have installed the same software's and all the configuration as per ...
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How low can I go on RAM?

I have some old PCs runnning on my business. And by old I mean PENTIUM-3 800 MHZ and AMD DURON 950 MHZ, with 256MB RAM. They are running my business software today on Windows XP. I want to run Linux ...