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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how does systemd activate encrypted swap file on alternate partition?

I have 2 partitions: / and /data. My swap file is encrypted at /data/swap. So /etc/crypttab looks like: root_crypt UUID=6666 none luks swap /data/swap /dev/urandom swap And /etc/fstab looks like ...
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Machine freezes once it hits swap space under heavy load

I encountered several crashes of my machine. Meanwhile, I can reproduce it when I start a program that fills up all memory. Once the system starts writing to the swap file, the system freezes and I ...
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31 views

vm.swappines parameter influence on system without swap partition

I run across following definition of vm.swappines: The swappiness parameter controls the tendency of the kernel to move processes out of physical memory and onto the swap disk. So, if I have ...
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Recover from faking /proc/meminfo

So, without really thinking too much, I ran this script: #!/bin/bash SWAP="${1:-512}" NEW="$[SWAP*1024]"; TEMP="${NEW//?/ }"; OLD="${TEMP:1}0" sed "/^Swap\(Total\|Free\):/s,$OLD,$NEW," /proc/meminfo ...
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Real-time monitoring of changes in swap use (per process)

I'm looking for a way to observe which processes in my system are consuming an increasing amount of swap over time. The following function generates a list of swap user per process : sbp(){ grep ...
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Creating a sparse (automatically expanding and contracting) swap file with hole-punching support

I have this crazy idea, and want to know the pitfalls of such an approach (or whether it can even work with no deadlocks.. etc). The goal is to create an automatically expanding and contracting ...
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37 views

Restoring in-memory/swapped page state on resume from hibernation

I'm a big fan of Linux's hibernation support, which works extremely well on all the (admittedly slightly older) hardware I've tried it on. I highly prefer it to full shutdown and power up. There's ...
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31 views

Old Xen Installation Unable to be Formatted

I recently tried to format a disk that had an old Ubuntu 14.04 partition and a Xen Swap Disk partition. I am currently running the Ubuntu Live CD and trying to access my partitions on the drive for ...
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What is kswapd_low_wmark_hit_quickly from /proc/vmstat

What does this parameter mean? # cat /proc/vmstat | grep low kswapd_low_wmark_hit_quickly 2
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65 views

Swap output in last x minutes

Is there any command or script to give o/p as " swap used in last 10 minutes is x" ? I wished to use that out put for my nagios monitoring.. I have used SAR in my below script and is trying to run on ...
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258 views

Ubuntu 14.04 using 100% swap space, with more than 40GB free memory, why?

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 ...
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129 views

Out of Memory with unused memory and swap

I have a strange error on my Raspberry Pi2. System is archlinuxarm. Short after boot (about 30 secs), the system states that it is out of memory, resulting in closing many applications, most time ...
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310 views

Process Being Killed due to low swap

I'm running a python (2.7) script on mac osx yosemite. The script is fairly computationally intensive, certainly bumping up against my machine's RAM limitations. The computer crashes and restarts ...
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342 views

Java process gets killed frequently by OOM - Killer on upgraded hardware

I am running solr on an Ubuntu server along with 4 other java processes. Current index size is 30 GB. My solr process gets killed frequently in few hours. It clearly mentions that its an OOM killer. I ...
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unlimited tmpfs

How to have the advantages of tmpfs and not be limited to its small size? I'm thinking of a shell script that runs as a daemon, monitors RAM and adds more swap files in specified folder, when memory ...
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723 views

full disk encryption (including swap, possibly plausible deniability as well)

I'm looking for a method to encrypt my laptop including the swap partition. I also read trough older similar questions but mostly the answer included just a what not much of a how. (Currently I'm ...
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194 views

Xeon Phi swap from host's tmpfs

I want to use swap on Xeon Phi (mic0) using RAM from the host On the host: # free -m total used free shared buffers cached Mem: 129022 60312 ...
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716 views

Increasing swap space without reinstallation

I'm running Fedora 20, and I forgot to change my swap size allocation during installation. I have 16G of RAM, so I'd like to allocate 32G of swap space. The install created a swap for me, of only ...
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How to ask for a password to mount crypted swap at boot time on Linux Mint 16 with initramfs-tools? [duplicate]

I use encrypted home folders on my notebook, which prevents use of hibernation on standard setup, because - and for a good reason - besides encrypting the home folder with ecryptfs, it reformats the ...
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66 views

HDD indicator blinks when I run out of memory, but I have no swap configured [duplicate]

I'm running Arch Linux, with 8 GB memory and no swap defined. Sometimes it ran out of memory, then my system get a little bit stuck, and I can see the HDD indicator blinking. Then I restart X, which ...
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124 views

Copy of full swap file is empty

I use a swap file (/mnt/swap). The swap works right. I need to get an access to the data stored in. When it's full of data in some part (which I can see typing "free" in terminal), I copy the file to ...
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93 views

Page cache elimination in Linux kernel

Optimizing the page cache space for less memory utilization in some system where systems don't have swap space and external flash drive or hard disk. Is there any possibility that if we can remove or ...
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swap partition and its laws

I remember for choice of swap partition, we should use (swap > 2xRAM) at least.Of course it deprecated , because max of computer's ram is very high. kernel support it. My question: i remember each ...
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Cleaning swap space while running

I have a theoretical question, What would happen if I clean up all the swap space while running, Would the operating system crash because of page faults that would happen in the kernel?
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717 views

How much swap space should I use? [closed]

What rules should I follow to determine how much swap space my linux-based computer should have today?
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584 views

LinuxMint, unable to set swap partitions to equal priority

I only recently realised that you can specify multiple swap partition, spreading them across drives. Well that's great for me as my desktop system often uses swap space and I have three different ...
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Delete a swap partition without user interaction

I have a VM with a swap partition on /dev/sda5. The problem is fdisk is interactive so I cannot use it to delete a partition without user interaction. How do I delete the partition in my ...
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80 views

How to create Swap from already created mount points

I have prepared a CentOS 6.5 with all mount points at formatting time, including swap. Now, when I am trying to run command swapon, it shows 0 0 0. And when I am trying to create it again using ...
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72 views

Linux Swap Space

I have 32GB memory. SSD and NonSSD drives. I installed Linux to NonSSD drive but I prefer SSD for /var directory and I didn't create swap space because there is high memory. I know physical memory ...
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193 views

Swap not mounting

I have just installed SolydX (Debian based) onto a laptop with the following specs: -Toshiba Tecra A4 -800MHz Centrino CPU -nVidia 6600 GPU -512MB RAM After installing Conky to monitor my system, I ...
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Create swap partition after install

I already have parititon contain data under lvm enviroment with centos 5.8 output of fdisk -l root@server [~]# fdisk -l Disk /dev/sda: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, ...
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1k views

What does m represents in VIRT column using TOP command

When we run top command it shows all the processes information. But under VIRT column there is m written against some values what does that m represents, is it MB . If yes then why it is only showing ...
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39 views

Vim saved file not updating on webpage

I am attempting to update an HTML file on my server, but when I do so it doesn't appear to be updating, but rather, serves an old copy instead. I went through the usual process of pressing :w and ...
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35 views

-/+ buffers/cache & Swap

When should the usage of swap get started? or How do I know that my swap is being used? At least some times if not always, considering the default swappiness of 60 Also, why does free offer to omit ...
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666 views

Why and how is swap improving performance, and can I disable it? [closed]

I have a laptop with 8GB of RAM running 4.0.4-2-ARCH. Recently, I installed Android Studio, and bam, my normally pristine system was suddenly stuttering and all out freezing (more than once). Before ...
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1answer
157 views

What is the difference between MAC OS X “Virtual Memory” and Linux/Unix Swap? [duplicate]

I would like to understand the difference of MAC OS X "Virtual Memory" and Linux/Unix Swap. I ask this because I observed that MAC OS X "Virtual Memory" seems to work way more efficient (in desktop ...
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588 views

Opening files of size larger than RAM, no swap used.

I found myself asking this question while doing small experiments and reading upon how memory is managed in Linux. I have a 64-bit Centos 6.5 machine with 512M RAM and 1G SWAP. I created a 1GB file ...
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224 views

Sanity check/cleanup for swap — essentially mkfs.swap

Occasionally I'll have a system crash or be forced to do a cold reboot. Upon rebooting I will get a kernel crash. Get out a rescue disk, rebuild swap, then everything boots fine. The thing is that I ...
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665 views

swappiness and RAM usage

Been going through this topic - http://askubuntu.com/questions/157793/why-is-swap-being-used-even-though-i-have-plenty-of-free-ram. Turned down swappiness to 10 and then to 0 but my installation is ...
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152 views

How to migrate files on Linux from HDD to SSD on a VDS

I upgraded my Dedicated Server and I was having problems finding my SSD. I found out how to MOUNT my SSD. I now have my 100 GB HDD and now 20 GB HDD. [root@server /]# mount /dev/xvdb1 /ssd ...
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799 views

Swap space not used

I recently installed Debian 6.0.6. Here are the machine's states: CPU - AMD XP 3000+ RAM - 1 Gig HDD - IDE 80 Gig I primarily use this machine for developing toy personal projects. When I run ...
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Zram does not start at start-up

I am using pinguyos 11.10. Pinguyos is a variant of Ubuntu 11.10. I have installed zram like this: sudo add-apt-repository ppa:shnatsel/zram sudo apt-get update sudo apt-get install zramswap-enabler ...
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set swap space to 0 on RHEL for testing

I have tried to change the swappiness to 100, and used the malloc() code in order to set the swap to 0 on my rhel system But this not seem to be helpful . The system memory allocation looks like this ...
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swap goes the second drive, how can I return it to normal from command line?

The following is my plan for partition of CentOS 6.7. I have two disks with A for system and files, B totally for backup. But, after installation, I log in using ssh root. Here is what I see: ...
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25 views

Crash with input/out error and swap unmounting [duplicate]

I am looking for hints on this problem. I've searched around, but can't find something exactly similar. I am running Debian 8 stable, updated, very minimal install (i3wm, small number of apps ...
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When hibernating : “PM: Swap header not found”

I've already seen Debian hibernate problem PM: Swap header not found, but the difference is that it's not a file swap but actually a swap partition. I'm on Ubuntu 15.10. My swap partition: $ ...
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Change percentage of time swap space is used

A question was proposed to me in an interesting format. I was asked "How would I set swap space to be used 50% of the time?" I know how to set the swapiness value in a range from 0-100 in ...
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138 views

How to calculate Swap warning/critical dynamically through script?

I have used SAR in my below script and is trying to run on individual servers for my nagios monitoring. Can someone please suggest how i can get the swap warning and swap critical values in my check ...
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55 views

Detect whether a swap partition is in use by a hibernated system

Is there a way to detect whether a swap partition contains the memory of a hibernated system? More specifically: suppose I have a Linux installation and that I hibernate it. This means that all the ...
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Is there anything in RHEL 6.5 that would affect I/O speed for something <24K vs >24K?

Generally, transactions for my app of setting and getting data internally are measured in a couple of millis. However, over 24K in size, that time can jump to just over 100 millis. Is there anything ...