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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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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How can I swap colors with GIMP?

I have made an image with three colors: RGB I want to swap each channel to a specific color. Is there a way to do that efficiently with GIMP? Example: I would like: Blue: #434343 Red: #EEEEEE ...
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When memory is swapped to disk, and later RAM is freed, does the memory get swapped back into RAM?

I'm guessing the answer depends on the OS. In this case, it is VMware ESXi. I created a low memory condition by migrating several VM's to a host that has memory over-committed. Once page sharing and ...
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What is the exact difference between the parameters (pgpgin, pswpin) and (pswpout, pgpgout) in /proc/vmstat?

Please note that this question is specific to linux only. And by swap space, I mean the dedicated swap partition. I did google a bit on this, and found these definitions: Paging refers to writing ...
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Moving Swapfile in Mac OS X Lion

I had previously consulted this thread when using snow leopard to move all swap to an SSD: Moving the swapfiles to a dedicated partition in Snow Leopard The information appears to be out of date at ...
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1answer
241 views

I have a Linux swap partition but how do I set it up permanently?

I have a laptop with 2GB RAM and not the funds to buy more RAM. Ever since I installed 64-BIT Mint (MATE desktop), I am using more than 1GB RAM compared to between 170 - 500MB when I was in 32-BIT ...
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1answer
27 views

Why does my swap partition not appear in GParted (runnning Linux Mint in VMWare)?

I'm running Linux Mint 17 in VMWare. htop reports that I have a swap of size 8187MB: http://postimg.org/image/a54es37wd/ I'd like to increase this but GParted doesn't show any swap partition: ...
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How can I find out processes are using swap space?

I have a linux server top reports about 9GB of swap used: But I cannot figure where's it use swap, some google results said that top - O commad follow by p will show swap usage by process. But as ...
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14 views

Network Card swap— not working

I took the network card out of my Acer Aspire 5920, and put it into my Compaq Presario CQ50. I downloaded and installed drivers for Windows Vista which is the OS for the Compaq, (but the Acer was ...
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Reduce “Metafile” memory usage?

My work computer (Windows 7 64-bit) spends a lot of time swapping memory when I switch between programs. This surprises me since I have 4 GB of RAM, and the programs I use aren't particularly RAM ...
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4answers
663 views

Force swapping of certain stopped processes

When I'm playing minecraft, my computer often has to swap because Google Chrome takes much RAM, too. So, I'd like to manually swap out Google Chrome. I know that I can temporarily stop all its ...
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1answer
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Agilent/HP 3070 Series III - HP-UX 10.20

I am attempting to solve a problem where I am unable to compile a file which is attempting to generate a file within the swap larger then whats allowed or free. I assume this to be the case because ...
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1answer
27 views

Pick which swap partition to use for Suspend to Disk

Is there anyway in Linux to pick which swap partition to use for Suspend to Disk? I have a setup with 2 swap partitions, one on an SSD and one on a HDD. I want the swap partition on the HDD to be used ...
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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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Linux Has Become Very Slow Dealing With Large Data

Last year I bought a computer, for around $1,800, so it is relatively high-end. When I first got it I was particularly pleased at how quick it dealt with large MySQL queries, imports and exports. But ...
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1answer
53 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 ...
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25 views

Does zswap compress pages, that written to swap device?

Does zswap compress pages, that written to swap device? Is it eligible to reduce swap IO?
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2answers
131 views

Increase Performance by utilizing RAM instead of swap (Windows 8) [duplicate]

My computer is pretty fast, but I feel it may be getting slowed down by putting things in swap which would do better in RAM. I have 16 GB of ram, and even in conditions where only around 3 GB is used, ...
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What's wrong with disabling the Windows page file?

People say that you always need a page file, and that it will increase performance, but my Windows 7 is set to run without a page file. I simply don't understand why people say this - I have 6 GiB of ...
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1answer
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I want to increase the swappiness in my windows 7

as I have 60% RAM usage every time. I have already increased Virtual Memory (Increased Swap Size) but want to increase swappiness too. see my RAM usage:
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5answers
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How to disable Mac OS X from using swap when there still is “Inactive” memory?

A common phenomena in my day to day usage (and several other's according to various posts throughout the internet) of OS X, the system seems to become slow whenever there is no more "Free" memory ...
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1answer
60 views

Move swap partition

How can I move swap (sda5) partition in my Debian 7 from main SSD disk to second HDD? lsblk output NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sdb 8:16 0 931.5G 0 disk ├─sdb1 8:17 0 ...
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What file system is swap on Linux

In Linux you can choose things like ext3 and reiserfs for partitions. For the swap partition, you just choose "swap." What file system is this, actually? Can you just create an ext3 partition and make ...
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2answers
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Can I use Nand flash as a swap memory in Embedded Linux?

I have 128 MB of Ram in one of my products, which was sufficient when we released first version of the product. But now we added some extra features in it, So this much Ram may cause a problem of OOM. ...
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OS-X how do I figure out is my swap file is enabled?

This may be a strange case, but I used to enable and disable my swap file depending on which apps I wanted to run. (I found that disabling the swap file when I would run Parallels made a difference. ...
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What happens when linux OS out of RAM and no swap

What happens when linux OS is out of RAM and no swap is available?
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2answers
359 views

Too Much Swapping, even though RAM is ~75% Empty

I have a VPS with 9GB RAM, 300GB HDD, 3 GB Swap, 7 Cores. The OS is CentOS 5.7 Final. I have postgres9.0 running on my machine, with proper tuning done (at least by book/wiki of PostgreSQL). What ...
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2answers
81 views

how much swap space is too much on x64 and will cause problems?

Apart from using up too much disk space, how much swap space can you allocate before it will degrade performance or cause problems on an x64 OS? What differences are there between the x64 OSes? I'm ...
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64 views

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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3answers
3k views

Swapon failed: Invalid argument on a Linux system with Btrfs filesystem

What's wrong with this sequence of operation, running on a Debian Squeeze system with a Btrfs filesystem? $ dd if=/dev/zero of=swapfile2 bs=1024 count=524288 $ sudo mkswap swapfile2 $ sudo chown ...
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678 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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1answer
624 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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Windows page file

I'm working on some CGI and am running out of RAM as well as page file space. However I have a second drive with a little extra space I could use for swapping. I have one question: If the swap space ...
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Is it possible to hint Windows to bring a process completely out of swap

Is it possible to hint the Windows virtual-memory-manager to bring a particular process out of swap? The situation I often find myself in is normally using about 50% of my RAM for all the normal ...
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What's using my swap (Ubuntu)?

I have an Ubuntu 8.04 server which is running a database and a bunch of Java application servers. Its memory configuration and usage is: total used free shared buffers ...
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1answer
292 views

Swap performance testing

I understand the general concept of swap memory, but I need to somehow build a program that forces the use of swap memory for performance testing and I don't know where to even begin. Basically, I am ...
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1answer
263 views

On Centos 6.3, why do several swap measuring methods return different results?

I have a production system running centos 6.3 with 96 Gb RAM and swap of 2 Gb. The intention is that there is enough RAM on the box so that no processes should get swapped. Over the last week or so ...
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1answer
1k views

What is the difference between swap entries in fstab?

I've been looking around and seen two different things ways to declare swap in fstab. I've seen something like the line below: UUID=UUID-HERE none swap sw 0 0 and UUID=UUID-HERE none swap swap 0 ...
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How can I make my computer use more RAM?

I'm running Windows 7 64-bit with 8GB of RAM. The problem is, I very rarely use all of it. I do some video editing from time to time and it definitely comes in handy then, but for everyday use, I'm ...
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3answers
5k views

Tuning Windows 7 for use in a VM

I'm running Windows 7 in a VirtualBox Virtual Machine, and would like to make it run in a more streamlined fashion. I'll be using the install primarily for testing web apps, and have no need for it ...
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153 views

What happens when zRam is overcommitted?

I can put whatever number I want when I set the size of a zRam block device. echo $A_BAJILLION_BYTES > /sys/block/zram0/disksize mkswap /dev/zram0 swapon -p 9001 /dev/zram0 How much is too much? ...
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Is my swap space being over used in OS X in /private/var/swap?

I'm using Disk Inventory X to look at whats taking up the most disk space on my HD. I understand that private/var/vm/ is where the OS stores items when it goes into hibernate. I have 8GB of ram, but ...
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1answer
139 views

Use swap only for hibernation

I have a swap partition /dev/sda1. It is 2GB in size and i only want to use it for hibernating. My system has 4GB of RAM. When I am low on RAM the kernel starts swapping and I can't even switch to a ...
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1answer
4k views

Where does VIM (gvim/macvim) keep swap files for unsaved/unnamed buffers?

Where does VIM (gvim/macvim) keep swap files for unsaved/unnamed buffers? (If it does so at all). Background: Throughout a semi intense seminar I was taking notes in an unnamed/unsaved MacVim buffer ...
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1answer
25 views

How to get data shown out of workspace or directly from application?

I'm a new user, because until this moment I used to handle with everything by myself. My problem is complex so I think I chose the right section. Because of some reason I had to use another web ...
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1answer
49 views

GRUB recreate a partition before booting a certain OS

I am having a problem of managing the swap areas on my hard drive. Side story: Due to having only a few GiBs free on my C:\ partition, Windows regularly shrinks the pagefile (even though it ...
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132 views

How to verify TRIM/discard on encrypted swap?

I am using an encrypted swap partition via ecryptfs-setup-swap on my Ubuntu 13.04 computer using a SSD. I have manually set up trim for my ext4 root partition (simply by adding the "discard" option ...
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2answers
584 views

Sharing RAM resources between 2 or more computers

I know there was a somewhat similar question before: How to share CPU or RAM? But, let me just specify it a little more... When Microsoft Windows requires more RAM capacity than available it uses a ...
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1answer
124 views

Grub rescue after windows install

Disaster, Please, Help ASAP. I had a dual boot on my pc with windows xp and lubuntu linux. Then recently i had some windows errors and decided to install windows 8 instead of xp. So after i ...
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1answer
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increase desktop responsiveness on linux while swapping

All GNU/Linux distributions I tested so far have the problem that whenever the ram gets filled and the system begins swapping, the whole desktop and graphical user interface becomes unresponsive as ...