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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Linux swap slowing my system?

Can swap really slow the system because it uses the hard-disk as a RAM unit ? I have Fedora 24 (Gnome) here with 8 gigabytes of swap and 6 gigabytes of ram , but i am noticing a very bad conditional ...
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swapoff failed: Invalid argument

I recently found that every time I shutdown/reboot my machine, there will be an logged error which says swapoff failed: Invalid argument. Jul 22 21:09:02 Frederick-Kubuntu systemd[1]: Stopping Update ...
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290 views

Is it safe to share a swap partition with more than one Linux OS?

I have one swap partition, and 3 installed Linux OSes. So I'm just wondering, are there any safety risks or potential problems that can come about as a result of having all 3 OSes use this partition? ...
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Cannot Find ~/.profile, Only ~/.profile.swp (OSX)

I am in the process of installing Homebrew, but, when I go to edit ~/.profile, I am finding that only the binary file ~/.profile.swp exists. I have been reading about swap files and trying to better ...
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22 views

OOM kills and swappiness for IoT devices with eMMC and SD storage?

I experience an occasional Out-of-Memory (OOM) kill from the compiler on BeagleBoards, CubieTrucks, etc. They are IoT devices, powered by ARM, generally have 512 MB to 2 GB of RAM, and use 4 or 8 GB ...
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Linux Mint Swap partition

I've recently installed Linux Mint as a secondary OS to my laptop which already had Win 10 installed. I could only add one partition for Linux Mint and install Linux Mint without the swap partition ...
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How to control when and how much Ubuntu uses swap memory?

I am running Ubuntu 14.04 guest virtual box on Windows 7 host. Recently, following instructions here, I created a 7GB swap on my Ubuntu guest which has been running super-slow on 3.6GB RAM with no ...
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157 views

What is faster: Intel's Optane SSD or RAM?

Time ago here was a question about speed comparison between SSD and RAM. So, RAM was much faster. It's ok. But Intel announced huge speed update with Optane SSD's. So, and probably we should try to ...
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Why swap isn't in use ennough on my system

I have Debian GNU/Linux 8.4 (jessie). I have this output of free: olga@olgacomp:~$ free -h total used free shared buffers cached Mem: 2.0G 1.9G ...
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What happens if you just unplug swap drive from running system?

I'm running heavily leaking apps on server which have already swapped out about 60gb of garbage in their over 100 days uptime. At the point when I've run out of swap for the first time (32gb) I ...
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142 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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Swap mounts according to fstab, but with priority other than expected

My /etc/fstab looks like this: UUID=881b584c-9e25-41e6-b3f7-31753ba63188 swap swap defaults 0 0 UUID=d29ab744-5520-42fb-9b61-8eb582a66005 / ext4 ...
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50 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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36 views

How to check Paging Memory on swap for Windows, via command line?

On Windows operating systems, we use the Resource Monitor to check the memory paging for my server. I need to check it via command line so I can put in my standard script to check and create text ...
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10 views

Proc filesystem: Diskstats

Heey i was looking through /proc/diskstats And noticed something "odd" in my eyes. As you guys can see i have a lot of ram devices. Could someone explain why there are so many of them? According to ...
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58 views

Swapping to increase cache?

I am using a server with 128 GB RAM. While running some job I see frequent swap usage. The out put from top top - 05:14:51 up 16:52, 2 users, load average: 3.99, 5.16, 5.37 Tasks: 760 total, 1 ...
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144 views

Is it possible to create a swap file for a Linux guest VM managed by Vagrant?

In my Vagrantfile I have the following provider defined: Excerpt from Vagrantfile: config.vm.provider :virtualbox do |vb| vb.gui = false vb.customize ["modifyvm", :id, "--memory", "4096"] end ...
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What kswapd is doing when there is no swap

The top look like this: KiB Mem : 3989652 total, 30976 free, 1480440 used, 2478236 buff/cache KiB Swap: 0 total, 0 free, 0 used. 2276236 avail Mem PID USER PR NI ...
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Should I use a SSD or HDD for “swap” on an old computer

Introduction Let's imagine some environment where the speed is not a factor. In my case I am using a really old computer for a "server" with a lot of stupid things ( personal lab ). It is more ...
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How to load entire process memory from swap quickly (linux)?

I run a bunch of CPU-hungry processes in parallel, they normally use a few GB of memory each. From time to time they allocate large amount of memory too (say 150-250GB). Usually at most one of the ...
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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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20 views

Monitor Linux per-runtime swap statistics

I've recently upgraded a low-end notebook from HDD to SSD, and, since there's only 700MB of RAM and no option of upgrading, I need to use that SSD as a swap drive, too. Since SSDs have a limited ...
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56 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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33 views

how does a process know it's pages have been swapped out?

Let's assume I have several processes running, a1 and a2. a2 takes so much space that physical pages belonging to a1 start to get swapped out. a1's page table has to be modified to reflect this. how a ...
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866 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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56 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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49 views

How to tweak Windows swapping priority (if there is some?)

Sometimes I open a program that allocates too much memory - i.e. computer has 0.5 gb free ram, and an application requests 1gb. In this case, it will start swapping so it can fulfill the request. ...
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33 views

How to clear swap used on CentOS?

top is showing very high swap used. Which is causing nagios to throw alerts. I've tried running swapoff -a && swapon -a sync; echo 3 > /proc/sys/vm/drop_caches but it doesn't clear the ...
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217 views

How make Fedora load every thing that was in RAM before hibernation into RAM again after wake up?

I use systemctl hibernate to hibernate my (Fedora 22) system. After reboot, It doesn't load everything into memory (Lot of memory stays on the swap) even though I have more then enough RAM for it. ...
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44 views

How to tell how much swap a Windows process actually uses?

In Windows 8.1 x64, I'm running a VBox machine that is configued to use 5200MB RAM. The host OS has 16GB of RAM, however often the other open programs add up and fill up the memory. My theory is that ...
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160 views

How to Logically Swap Fn and CTRL keys in Lenovo E40-80 i5 Laptop?

How to Logically Swap Fn and CTRL keys in Lenovo E40-80 i5 Laptop? As Physical swap is not possible due to key size difference. I have tried the possible methods like looking at BIOS, as suggested by ...
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329 views

Move swapped data to memory on a Mac?

I want to move the swapped content to my RAM. I currently have 6800/16384MB RAM and 241/1024MB of swap used. In Linux one could execute this command to disable and enable the swap to force move the ...
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30 views

is it necessary to create swap partition while installing RHEL?

I'm a newbie to RHEL.I've installed RHEL 7 using VMware .but,during the installation ,it asked me to create Swap partition and i created it worth 2GB. please brief me the reasons.what if the swap ...
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54 views

How to limit swap usage?

I want my computer to automatically hibernate when the UPS switches to the battery, so I need enough free swap space at any moment. But if I activate the swap partition, even right before the ...
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96 views

Permanently increase swap size?

I'm using these commands to increase swap size (on existing swap): dd if=/dev/zero of=/.swapfile bs=1M count=1024 mkswap -v1 /.swapfile swapon /.swapfile It does increase, but after server reboot, ...
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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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44 views

Prevent KDE from swapping

I've realized that my laptop was overheating as a result of lots of I/O, so I searched for the programs who used swap, and I found the following: $ pgrep kwin 13387 $ pgrep plasma-desktop 13424 $ cat ...
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Do I need to worry about over-provisioning? Can swap be used for this purpose if it is not being used?

I am running Linux Mint 17. I'm posting this on Superuser rather than Unix & Linux because this probably isn't a Linux-specific question. I was thinking of buying a SSD but a ~250GB drive will be ...
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91 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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57 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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1k 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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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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2k views

How do I know how much swap is used on Windows 7?

Apparently, as per Commit charge is 100% full but physical memory is just 60% when using no page file and http://brandonlive.com/2010/02/21/measuring-memory-usage-in-windows-7/, the Commit numbers in ...
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55 views

What's the total amount of memory and swap a process is using?

http://windows.microsoft.com/en-us/windows/what-task-manager-memory-columns-mean#1TC=windows-7 If I'm reading correctly, there is no way to see how much swap is used by a process. Is this correct, ...
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77 views

Can a filled up swap partition cause file locking issues on linux

I have a machine at home running elementary OS 0.2 with very little RAM, the swap is always allmost full (I'll upgrade the RAM as soon as I can.) It has an OpenSSH server set up with public key ...
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Is it possible to make a swap space(partition) in windows 8.1 like linux?

I'm using alot of ram on a daily basis and I know you have swap partitions in linux to help this, is it possible to do in windows 8.1 and if so, how? thanks
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110 views

Windows 7 Swapping Threshold

When physical memory jumps to 80%, the RAM starts swapping itself to pagefile. How to increase this 80% threshold to say 90% ? I have 4GB of RAM which means the swapping starts when 3.2GB of RAM is ...
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59 views

Is it a bad idea to make a swap partition on a SSD?

Since it has limited amount of read/write cycles, it seems to be a bad choice but I have no solid reasoning on why or why not to use it other than that.
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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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633 views

Linux server is running out of memory and swap

I guess there is some memory leakage and memory is not being freed. Is there some good ways to find out which process and why is leaking memory? The only temporary solution is to restart server. But ...