Try Gnome or KDE system monitor tool. For example, the GNOME System Monitor shows you what programs are running and how much processor time, memory (including paging/swap space size), and disk space are being used.
This page showed you how to check for swap space size and utilization in Linux. If you see a large percentage of the swap space utilization, then it is time to add more physical RAM to the Linux system. Another option is to increase swap space by adding a swap file on Linux. Please see the following resources for more info:
Download Memory Info Swap Check Apk
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Linux memory management is an essential aspect of every System Administrator to improve the performance of a Linux system. It is always a good practice to monitor swap space usage in Linux to ensure that your system operates relative to its memory demands.
Swap space is a restricted amount of physical memory that is allocated for use by the operating system when available memory has been fully utilized. It is memory management that involves swapping sections of memory to and from physical storage.
From the output above, you can see that the last line provides information about the system swap space. More usage and examples of free commands can be found at: 10 free Commands to Check Memory Usage in Linux.
These are easy methods one can use and follow to monitor swap space usage in Linux and hope this article was helpful. In case you need help or want to add any information relating to memory management in Linux systems, please post a comment. Stay connected to Tecmint.
Edit: I did it with configurable memory allocation.I understand it is not good idea, as most OS manage memory for us, but my application was an ETL framework (intended to be used on server, but was also being used on desktop as a plugin for Adobe indesign). So, I was running in to issue of because instead of using swap, windows would return bad alloc and other applications start to fail. And as I was taught to avoid crashes and so, was just trying to degrade gracefully.
Compared to the /proc/meminfo file, the free command provides less information. However, it is easier to understand. The key figure being the available value as it displays how much memory is still available for running new applications.
Aside from providing you with essential memory information, the top command provides a limited interactive interface. It is possible to manipulate and configure operations by using command-line options.
This guide provided several options to check memory usage on your Linux system. We learned that a single command provides an abundance of valuable data for future analysis. Learning to interpret the information correctly is critical.
the windows memory check is currently not very precise with the
respect to the handling of the page
file. My initial assumption
that the page file works similar to Linux swap space was completely
wrong.
the windows memory check is currently not very precise with the
respect to the handling of the page file. My initial assumption
that the page file works similar to Linux swap space was completely
wrong.
Am 05.10.2010 01:50, schrieb Anton Rothenbacher:
> Greetings all, say could someone explain what counter is used by
> check_mk when it is displaying the "swap" usage from the windows memory
> check?
> Sometimes I'm seeing a negative value for swap file usage - that is the
> main thing I'm not really understanding.
Am 05.10.2010 01:50, schrieb Anton Rothenbacher:
> Greetings all, say could someone explain what counter is used by
> check_mk when it is displaying the "swap" usage from the windows memory
> check?
> Sometimes I'm seeing a negative value for swap file usage - that is the
> main thing I'm not really understanding.
I have one VM that has been flagged for the "VM memory swap" alert since installing Hyper9. Yet the guest has more memory than it has every needed, such that it is also flagged for the "VM memory rightsize" because it is only using ~3% average mem. vSphere Client corroborates the low mem usage, so I'm puzzled why Hyper9 is seeing ~26% mem swap.
The Installer should create a swap partition automatically. And also note that, You may never need a swap partition, unless you use "Hibernation" feature or use many more applications at a time. You can check these interesting question about swap size
If you run out of physical memory, you use virtual memory, which stores the data in memory on disk. Reading from disk is several orders of magnitude slower than reading from memory, so this slows everything way down. (Exchanging data between real memory and virtual memory is "swapping". The space on disk is "swap space".)
Each time we need that memory it needs to be swapped back into memory (swapping some other piece out). There are extremely intelligent algorithms to minimize the delay, but still sometimes we have to wait.
On windows, if you look at the task manager, you can show the column page faults. This shows the number of time, an application asks for a piece of memory that was on the disk and needs to be swapped. Lots of page faults = slow application.
If you don't want to use swap, then don't use a swap partition (comment out the line in /etc/fstab), but that will prevent to start new process and will make malloc fail if you run out of physical memory. That's not a good idea in general... not very safe and not even very useful, as the OS will keep the hot pages in memory and will swap to disk those that are not being used recently.
Another solution could be to hack your the database so it locks the pages into memory (I know that can be done, but I couldn't tell you now exactly how), but anyway, it's likey that your database will use it's own swapping and caching mechanisms.
I have found a partly answer. A Swap Memory is a space in the Hard Disk of your computer that Operating Systems will use to put the info that is actually on the RAM to free it for another application. This should be done when the system needs memory for a new process and there is none, so we can see that if our system has plenty of RAM it will maybe need no SWAP memory.
To find out where Swap space (or virtual memory) you can go to Task Manger (CTRL+ALT+DEL) and turn on from VIEW -> COLUMNS -> VIRTUAL MEMORY. Now just calculate the difference between memory usage and virtual memory.Also here is an instruction how to see it if you are running Vista: _5067693_increase-swap-space.html
In both Linux and Windows, there are dedicated RAM memory space. If RAM has an insufficient amount of memory to hold a process, it borrows some amount of memory from the secondary storage. In this way, the RAM finds sufficient space to hold a new process within it. Hence, the borrowed space from the hard disk is called Swap Memory.A swap file is a system file that creates temporary storage space on an SSD or HDD when the system runs low on memory.
If you do not want your processes to use swap-memory, just disable swap memory altogether. Unfortunately, if you ever run out of memory, the Linux kernel will kill some of your running processes in order to free up some memory for use.
I have a laptop with 768Mb of RAM that does not use swap memory. It is good enough for my needs. I have a server with 256Mb of RAM and does not use swap memory. It is running 8 virtual servers using OpenVZ virtualisation, without problems either.
Download: ../code/check_memory_parallel/memory_parallel.hHere is a program to test our functions. This time, for simplicity, we allocate only one vector on each process. Then we print out the memory information.
Since around the time of the kernel 5.0 upgrade (yes, I know, it's been quite a while), I've been noticing the following chain of events occurring frequently: a small amount of memory is moved to swap (8K or so) during a RAM usage spike, then that amount slowly increases over time, and before I know it I'm 200M, or 500M, or 900M into swap. (I have RAM/swap usage indicators in my status bar, so I pay a lot of attention to this.) Recently, I've walked away from my machine a few times and returned to find my swap usage at 1.9G (I have 8G of RAM and an 8G swap partition). It's gotten so bad that I wrote a bash script to run basically 'swapoff -a && swapon -a', because I was sick of retyping it.
Currently, my best guess regarding the cause is that the combination of used memory + buffers + cache fills the RAM (my RAM usage is normally quite high), and the kernel solves this by moving things into swap. I don't want it to do that. I want to tell the kernel "only use swap space as an absolute last resort, right before you engage the OOM killer; you can throw out all the caches first if that will help." (Not sure if there's a way to do that, just want to make it clear what I'm trying to do here.) I'm willing to take minor performance penalties (because I know the kernel is probably smarter at managing memory for maximum efficiency) to accomplish this.
And I've tried. To start, I set 'sysctl vm/swappiness=0' (yes, in /etc/sysctl.d, so it's preserved across reboots). It made no difference whatsoever. I searched around to try to find any other sysctls I could tune, but the few things I found went beyond my comfort zone (my knowledge of how the kernel handles memory is limited). I tried making a few changes based on things I saw on Stack Exchange, but I didn't notice any difference and I reverted them quickly. ('sysctl vm/vfs_cache_pressure' shows 100, in case that helps -- I saw it mentioned in some of the results.) The problem has persisted; if anything, it seems to have gotten worse following recent kernel releases. 2351a5e196
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