Swap space is a virtual memory of RAM. It is used when the amount of RAM is full. Swap space can be a dedicated swap partition, a swap file, or a combination of swap partitions and swap files.

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Windows obstinately shrinking the pagefile

I admit I have rather small free space available on my C:\ drive (only 3-4 GiBs usually, with a 4 GiB pagefile being around), but what really annoys me is this: Windows sometimes does an operation(1) ...
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2k views

Why does swapon take ages when enabeling a swap file?

I've created a swap file with dd if=/dev/zero of=swap.img bs=1024k count=4k mkswap swap.img swapon swap.img While this works, the swapon command takes ages (approx 10min) to finish. Enabling the ...
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378 views

Should I use the openSUSE installer to encrypt /swap until ecryptfs is updated to work with systemd?

I recently installed openSUSE 12.3. I didn't use any partition encryption in the installer. Immediately after the install was complete, I installed ecryptfs-utils and ran ecryptfs-migrate-user -u ...
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1answer
2k views

How can I get Linux to not thrash and just kill processes?

Firefox (and flash) tends to chew up memory at random times, causing my computer to thrash, and it drives me crazy waiting for the oom_killer to kick in and kill processes,[1] while I can't do ...
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1answer
312 views

Protected with Linux Per-Directory Encryption (no swap)?

I have been using full-disk encryption for some time on Linux with good success, but the additional layer of complexity that it adds is something I'd like to avoid, e.g. backup/system restore ...
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204 views

Filesystem of swap space

What is the name of the filesystem used for swap space?
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397 views

Debian extremely slow resume after hibernate

I have a very irritating issue with my Debian 8: resume after hibernate takes from 5 to 10 minutes. During resume time system shows me picture on a display but not respond, cursor are not moving, ...
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243 views

OpenWRT and USB write cycle limit

Background (feel free to skip) I am currently usin OpenWRT at home. I have an external HDD connected to router's USB port for the network shared storage. Actual transfer speed from the HDD to the ...
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497 views

Should the CPU usage go up to 100% when swap happens on Linux

I had been running a demo system on Linux with the following kernel: 2.6.32-400.1.1.el5uek #1 SMP Mon Jun 25 20:25:08 EDT 2012 x86_64 x86_64 x86_64 GNU/Linux And as soon as swap happens, the CPU ...
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973 views

My Ubuntu laptop swap cache to disk freeze my system

My laptop is Thinkpad x220, 4G ram, harddisk is 7200rpm, installed with Ubuntu 12.04, using Unity desktop. When I open eclipse and chrome, they eat about 2G memory. Here is the free -m result: ...
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Moving the OS X swap file to a faster drive

I have a new Mac Mini that's running the latest version of Snow Leopard. The internal drive is a bit of a slouch. I'd like to move the swap file (or whatever it's called is OS X) to my faster external ...
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Is it possible to mount a swap partition into a directory?

I want to have a look inside the swap partition of an external linux drive. How can I mount it as a regular file system directory? I tried mounting it via mount -o loop,offset=35556433920 -t ...
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330 views

Why is my system swapping if there is free RAM available?

I have a KVM host running several virtual machines. The hardware is comprised of 24 cores w/ 40G of ram. This is the output of the free command: total used free ...
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3answers
1k views

What is the meaning of pri=42

When mounting a swap partition on Linux, what does the mount option pri=42 mean? fstab: /dev/hda1 swap swap pri=42 0 0
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1answer
51 views

Does dual boot linux need two swap partitions?

My harddrive is partitioned as follows. I used GParted to gather this info. /dev/sda1 ---- ext4 ---- Ubuntu /dev/sda2 ---- extended ---> /dev/sda5 ---- ext4 ---- Kali ---> /dev/sda6 ---- linux-...
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3answers
163 views

How to increase swap memory in Windows? [duplicate]

I bought a new system with 4 GB of RAM. I don't know how do I check how much swap memory I have allocated. I know that we can increase RAM physically. I want to increase swap memory on windows. How ...
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5answers
4k views

Linux - Move partition from back of disk to the front for performance

Hard drives have faster performance at the beginning of the platter (see zone bit recording). According to an answer to "What is the purpose of multiple swap files?", you should put your swap ...
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How can I find out the size of a swap partition?

What are the sizes of the following swap partitions? root@pc:~# swapon -s -v Filename Type Size Used Priority /dev/sda5 ...
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3k views

Why using swap file over a SMB/NFS mounted filesystem is not possible in Linux?

I'd like to use another machine's unused RAM as swapspace for my primary Linux installation. I was just curious about performance of network ramdisks compared to local (slow) mechanical hard disks. ...
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1k views

How to create Swap in Fedora?

I am new about swap and filesystem. Now I encounter a problem: 2G ext4 disk /dev/sda7 # Want to be used as swap in fedora 24G ext4 disk /dev/sda8 # My fedora is built on it without Swap As ...
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4k views

Changing Linux swap partition

I want to change the swap partition to another partition. Is there a gui that can make this process easier so I don't have to do things like manually editing files?
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670 views

When is swap memory useful? Why do we need to set it to twice the amount of RAM? [duplicate]

I know that memory will be swapped whenever RAM usage is high. And I read that we need to set swap to be twice of the amount of RAM. But why? How will it shift from RAM to swap? If we do not have swap ...
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906 views

Will increasing swap partition size increase the memory that can be used by a program?

I have a program that requires a lot of memory. So much that the malloc fails as the system goes out of memory. I don't care if the overhead for swapping pages in and out of the disk is too high - I ...
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2answers
3k views

Why won't Ubuntu use swap?

I'm running 32-bit Ubuntu 10.04 on a 4-core AMD Phenom machine with 4GB of RAM. With normal use (a dozen or so Chrome tabs, 1 VirtualBox machine, 2 or 3 instances of QtCreator, ) the memory will ...
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86 views

Should a Linux Swap partition be on the RAID?

When setting up a new system, if I am planning on mirroring two hard drives, what should I do with the SWAP area? I can think of three things I can do... Do a mirror of the SWAP partition Stripe it ...
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250 views

What does the messsage "Adding *k swap on …' mean?

I have the following message in the syslog on some machines: Adding 8385920k swap on /dev/sda3. Priority:-112957 extents:1 across:8385920k What does it mean? Is it a problem? And why is this ...
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392 views

What type of data is stored in the swap partition?

When a page fault occurs, the system must fetch the page from disk. Does this mean that there is a page table stored on the hard drive for every running process (to fetch the page from)? If yes, ...
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3answers
3k views

How to stop swap process in OS X?

How would I prevent OS X even looking for a swap file? I killed the swap file on my MBP. This is dead easy: just change the default swap file location so the system can't find it (goto /System/...
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754 views

Mount: unknown filesystem type 'swap'

I'm running vanilla Debian Jessie and I need to enable swap file. It works fine when I use swapon /var/swap.img but I'm unable to make it mount with fstab at boot time. The following entry in fstab: ...
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51 views

Is it possible to manually send programs to virtual memory in windows?

If you have many open programs and your machine is going too high on memory/cpu utilization you might want to close a program without loosing its state (sending it to virtual memory) and then resume ...
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1answer
55 views

how to check how much memory processes take?

As we know in Linux machines, we have RAM memory and swap memory. My first question is: What is the reason that the swap memory is increasing – because high level of using the RAM memory or ...
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993 views

What is swap and how to disable it on Ubuntu/Linux

I've read it many a times online that swappiness should be decreased or disabled. Is it so, what does it do? I have 2GB of Ram, should I disable swappiness?
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How do i increase my swap partition size in Ubuntu?

I had a 2 GB RAM before. So When i installed Ubuntu i just gave 2 GB for Swap partition. Now I Had increased my RAM capacity to 4 GB . How can i increase my Swap capacity to run my OS smoothly? Please ...
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34 views

How can I change the amount of data copied back into RAM when resuming in Linux?

Normally when I shut down my computer I hibernate. On the next boot I then resume. My problem is, that it seems that Linux just copies the least amount of data that is needed back into ram, because ...
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How to activate swap on Linux? “swapon -a” doesn't seem to work?

My computer has quite some memory (6GB) which is enough for most of what I do. A while back I was messing with my swap, turning it on and off with sudo swapon -a and sudo swapoff -a. In then end I ...
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181 views

Swap and Root: same partition

I have 3 partitions, and I can't delete any of them. (Recovery, SYSTEM, C:), and I need to install GNU/Linux. How can I have swap and root on the same partition?
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925 views

Mount /tmp on swap in Linux

I have seen this before ... the /tmp directory mounted on swap space. I am aware something similar can be done using tmpfs, but I don't think that what was being used. I too would like to mount /tmp ...
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1answer
658 views

Replace 60GB solid state drive with a higher capacity one [duplicate]

Possible Duplicate: Move smaller hard drive to partition on a larger hard drive restore a smaller hard drive 320GB image to a larger harddrive 1TB I have a 60 GB solid state hard drive on my ...
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1answer
64 views

Additional swap created on a new partition gets removed on reboot

I have created a new swap volume using logical volume management tool on RHEL. Suppose the volume is /dev/rootvg/swap2 I did mkswamp /dev/rootvg/swap2 and then swapon /dev/rootvg/swap2 when listing ...
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Linux Virtual Memory/Swap isn't being used

I think my virtual memory is not configured correctly on my MintLinux machine. I opened up a new IDE, IntelliJ IDEA, and my whole system appeared to freeze. I tried to TTL to the console but that did ...
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4answers
293 views

SSDNow100VS2 Page File (Windows 7) [duplicate]

Possible Duplicates: How to control RAM / swap usage Should I keep my swap file on an SSD drive? I just put an SSDNow100VS2 into my laptop, with Windows 7 Ultimate 64, and 4GB of ram. I'm a ...
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3answers
799 views

Memory and SWAP in Ubuntu

When I go to the system monitor in Ubuntu, about 75% of the Memory is used and 45% of Swap is used. Why is the Swap used even when Memory is available? Doesn't Linux move data from Swap to Memory?
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815 views

linux swap disk priority

Let's say you have two swap disks, set up like this: swap1: priority = -1 swap2: priority = -2 Is this going to be any different from the following setup? swap1: priority = 47 swap2: priority = 10
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2k views

Memory percentage in top (linux)

Just wondering (1) is the memory percentage in top for a process is relative to memory or relative to memory+swap? (2) if it is the former, how can I get the latter? Vice versa. (3) To determine ...
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1answer
100 views

How to create swapfile on ssd disk with btrfs

I have SSD with btrfs, I tried creating a swapfile like: dd if=/dev/zero of=swapfile01 bs=1M count=10240 mkswap swapfile01 chmod 600 swapfile01 swapon swapfile01 In dmesg I see [238434.731654] ...
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43 views

Linux swapping too much

My Linux (Mint 17.2) computer has 4 GB of RAM and 8 GB of swap partition. I have swappiness set to 10 instead of default 60 and it works perfectly, sadly only for some time from start up. When I ...
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35 views

Swap operations and boot are much slower in Windows than in Mac OS

I have a MacBook Pro 15" Late 2011, where I have installed Windows 7 and Mac OS Lion in dual boot. I have disabled Windows Pagefile because I have installed 16 GB RAM. I cannot figure out why ...
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38 views

Empty swapfile after using dd

According to many tutorials available on the internet (like for example this one https://www.digitalocean.com/community/tutorials/how-to-add-swap-on-ubuntu-14-04 ), to generate a swapfile, i need to ...
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29 views

Bind Solaris 10 swap file

I have created an Oracle swap file to enhance my swap space. I have to do this for a Oracle Client installation. After creating swap file i Run the swap command to specify the additional swap space ...
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2k views

why do i get swapping even if i set vm.swappiness to 0?

I have a couple centos 6.5 x64 servers with 64GB ram running lots of kvm vps's. some of these servers have no swap usage at all and some do. I've set swappiness to zero. However some still swap even ...