Questions related to memory usage related to RAM, swap; issues expansion, in Ubuntu.

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100 views

Why are memory statistics in top and htop different?

Whenever I use top and htop commands to see memory stats, they are always different as shown in figures. Which should I trust?
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'mysqld' using a lot of ram in Ubuntu 16.04, is it normal?

I am working on my Django project and recently installed mysql-server on my ubuntu 16.04. It is using a lot of ram approx 800 MB to 1GB, is it normal? Picture attached :
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1answer
39 views

Invisible processes using all of system memory

I have a VPS (Ubuntu 14.04) with 512MB of RAM. This used to be quite enough, but for a while, this has been causing problems -- something is eating up all of that memory, and my debugging has left me ...
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1answer
35 views

How to use available RAM? [on hold]

My computer running Ubuntu 16.04 has 32GB RAM, but even on heavy tasks, rarely over 8GB is consumed. I wonder if is possible to tell Ubuntu to use more RAM to speed up the process. Moreover, after a ...
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1answer
43 views

Ubuntu 16.04 System crash when out of RAM

After upgrading to Ubuntu 16.04 from 15.10. I experienced crashes (system not responding, requiring a power off) every time I was running out of physical memory (using up all the RAM).
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16 views

What is the part which is the subtraction of SHR from VIRT or USED in the output of top?

In the output of top, if I am correct both VIRT and USED are the total space that a process occupies in the physical memory and in swap. (I admit I don't know their differences) Then what is the ...
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2answers
50 views

How to force gcc & ld (make wholly) use less memory?

I have to compile a computer generated source with my sources which is too huge and I've no control over it. Since my memory is not much, I've to force make use less memory. Otherwise, it gets killed ...
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16 views

Swap priority gets set to -1 on each boot

I have a swap partition of size 7.9 GB. When I use the command free, it shows this: NAME TYPE SIZE USED PRIO /dev/sda7 partition 7.9G 0B -1 The swap partition is not being used and ...
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2answers
75 views

Ubuntu Server 14.04 run out of memory

Attach is the screenshot of htop program. The memory usage always increase, but I could not find what program is eating my RAM. Afterwards, only 200MB memory left free :'(. Could you give me some ...
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1answer
105 views

keep memory usage low Ubuntu 16.04 Server guest VM

I have an Host Machine running KVM+QEMU and multiple guests. All Guests are running Ubuntu 16.04 (virtual machine installation). My current problem is, that the host memory consumption (via htop) is ...
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2answers
66 views

Server out of memory - started to kill all processes

Is possible to get know what process consumed all memory or why server start killing all processes? All started about 02:47 Kern.log Syslog.log
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1answer
210 views

What do the changes in `free` output from 14.04 to 16.04 mean?

I noticed that the free command reporting has changed somewhere between Trusty and Xenial. Here is what `free -m' shows on one of my Trusty computers: $ free -m total used ...
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1answer
27 views

Memory issues with recently installed ubuntu

Forgive my inexperience with Linux, but I've attempted to search for my issues but can't find answers. This started when I saw that my PC doesn't give a dual-boot menu on start up and goes directly ...
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0answers
25 views

How can I reserve memory for a specific application? (redis in this case)

I've installed Redis-Server on an Ubuntu Server 14.04 64 bit LTS and assigned 47GB of RAM as am expecting to temporarily hold data in RAM before dumping it eventually to Postgresql. I've noticed that ...
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0answers
495 views

High usage of ram in Ubuntu 16.04

I have a problem since I upgraded from 15.10 to 16.04 some days ago: My ram is almost completely full! I have 8 GB of ram on my system, currently 6,9GB are used (with just firefox open). I've ran a ...
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1answer
451 views

High SHMem memory usage!

I have tried everything I could think of so here I am asking this question here... I have a computer that has 8 GB of RAM. After booting the computer, logging in, not opening any applications and ...
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5answers
1k views

akonadi services and mysqld use too much memory in kubuntu 16.04

I recently installed kubuntu 16.04 on my Dell studio xps 1640 that has 8GB of Memory installed. Everything is working fine but Something is really bothering me. After a fresh boot up, when i check the ...
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1answer
59 views

Memory usage by Java processes

I notices that applications use almost all memory on my ubuntu 14.04 server. Can you look into my htop screen and let me know whether this situation is normal? There are many processes for two ...
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2answers
76 views

Very slow ubuntu Desktop

I have use 2GB With Dual Core Processor Computer, and install ubuntu 12.04, Even though the computer is running very slow, All time Show CPU Uses 100 %, and Memory Uses 100%. So What should i do to ...
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2answers
74 views

Normal RAM usage of the Ubuntu 14.04 LTS (Server Version)? [closed]

my question is how much RAM a Ubuntu 14.04 LTS server normaly uses? when nothing is installed on it?
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0answers
15 views

How to find the first device address of request using blktrace?

I have traces of running an "f2fs" on an usb-drive. I would like to use them as inputs to DiskSim. DiskSim requires the first block number that has been traced. Is there a way I can find that by ...
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1answer
54 views

How to show top ten memory consuming processes with ps?

As stated in the question I want to list the top ten process in my ubuntu which consumes more memory I am using ps aux --sort -rss which sorts based on memory consumption. As the number of processes ...
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2answers
243 views

Out of Memory Issue

I am running Ubuntu 14.04LTS on a Dell PowerEdge R730 with 32 GB of RAM and an Nvidia K80 GPU.. I have a python script that runs for a long time, but really just makes a bunch of relatively short-...
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1answer
260 views

Ubuntu 15.10 - high ram usage

I am writing because I have no idea what going on with my favourite os, Ubuntu 15.10 with the kde desktop. The problem affect ram usage in normal work (chromium/firefox browser with few cards and ...
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1answer
41 views

Abnormal usage for memory

These days, my linux VPS is very slow, for that I've installed htop package using apt-get to see what is happening to my server. When I opened htop, I see that my server is using approximatively 700 ...
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1answer
44 views

Quickly execute commands without running out of memory [closed]

I am writing a .Net application that runs on Mono. It executes and gets the output of several terminal commands every second or so, continuously. However, after several seconds, it will crash ...
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20 views

Workaround for program with memory leak

The caffeine indicator (which keeps my screen from turning off when I'm watching something), over time uses increasing amounts of memory, such that at the moment (having run for a week or so) it's ...
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0answers
52 views

Ubuntu Memory Low

When I SSH in, my memory usage is at57%. It looks like I have very little RAM available but I don't think that was the case before... ubuntu:/etc/projects/myapp$ free -h total ...
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2answers
61 views

Allocate less memory to processes to load a 6.8 GB dataset into R running on 8 GB machine

My idle system (64bit Ubuntu GNOME 15.10) uses around 2.5 GB RAM after restart, i.e. there's no running program launched by me. None of the applications I installed starts on startup. Which system ...
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92 views

Atom is too slow on Xubuntu

When I open Atom on Xubuntu all the application start lagging unlike Sublime text editor. Before I open Atom: After I open Atom:
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12 views

Erase swap memory storage when app load decreased

I have enough RAM for most purposes, but sometimes I inevitably get carried away with the number of apps and tabs I have open, pushing short-term memory storage into swap. I'll then do an inventory ...
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1answer
66 views

monitor memory usage of a single process in Ubuntu

Do you know How to monitor memory usage of a single process? I want to get Memory usage over a given time frame including maximum usage and average usage. Don't tell me use top -p PID, since I ...
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43 views

No keyboard input on login screen

On the screen where I would normally enter my password to unlock my computer I cannot type anything. I've tried switching USB ports for my keyboard and even check to see if the keyboard does work in ...
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3answers
90 views

How to print out memory usage by applications?

There are couple of commands to show memory status such as free, top, htop, etc. I want to know how much memory has occupied by my application. Actually, sometimes my Ubuntu is very slow even after ...
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1answer
88 views

Computer slows down

I am running latest Ubuntu having upgraded (twice now I think). When I boot up, my computer is using 600Mb of memory. I then use 3 instances of Chrome with multiple tabs, Atom and VS Code and run gulp ...
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0answers
43 views

Memory usage between Ubuntu releases

What is the difference in memory usage between LTS Ubuntu releases. I rent a Dreamhost VPS with 300Mb that provides Ubuntu 12.04.5 LTS and I am afraid that if I upgrade I will lose ability to run ...
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0answers
143 views

Can Ubuntu get slow due to chrome using too much of the ram?

I work a lot with the browser (Google Chrome) and I open many tabs. Sometimes my system slows down and I think it should not happen to a brand new mid range good quality laptop. I am just wondering if ...
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1answer
223 views

How do I make Firefox in Lubuntu use less virtual memory?

I have Lubuntu 14.04 installed on an old XP desktop, which has an Intel Celeron 2.00GHz and a SiS 651 graphics chipset. I have upgraded it with as much memory as it will take (2GB DDR), and a 120GB ...
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2answers
102 views

limit eclipse from taking over the RAM

I'm using Eclipse in Ubuntu 14.04 for scientific stuff and my code consumes a lot of RAM. When I run my code in Eclipse, I see in System Monitor that the RAM usage goes up to almost 100% and at the ...
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1answer
43 views

Is there any way to remove space to the `/home` partition and assign to `/` partition?

I am new in ubuntu. I am using Ubuntu 14.04 on dual-boot system with Windows 8.1. I need ubuntu to work with databases that handle large volumes of data. When configuring the system I assign to the ...
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20 views

Memory overflow issue with cpp program

I am facing quite a strange issue nowadays, I am not sure why I never noticed it previously. When I am running a cpp code and if there is some infinite loop or some erroneous thing which is causing a ...
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1answer
75 views

How to check what is VIRT memory usage composed of? Huge value (253G) in VIRT htop column

After upgrading to 15.10 and KDE 5.4.2 some KDE-related processes sometimes have a huge VIRT value in htop, for example: top shows almost the same, 0,247t. Is there any way to see what it's composed ...
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3answers
326 views

How to keep Firefox usable without ever closing tabs manually?

When using Firefox on her computer, my wife opens a new tab when starting a new search, and opens links in a new tab when she may want to use the linking page later. However she never closes tabs, ...
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1answer
270 views

Why is that much memory used while I only have a terminal window open?

I just installed Kubuntu 15.04, installed VLC, Chrome and configured some settings then ran sudo apt-get upgrade to upgrade the system and noticed that 2.6 GB of ram is being used! (and 3.4 GB while ...
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90 views

Set limits on processes ubuntu

I am using my ubuntu to do some programming assignments at college and it keeps hanging. For example, If I have an infinite loop in my C code by mistake, ubuntu freezes. If my C program allocates ...
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1answer
196 views

Firefox is using too much memory and is freezing my machine

I have some 40 machines in our company. They are running Ubuntu 14.04 with 4Gigs of RAM. Very recently I noticed that almost on all machines Firefox browser is using around 1.2 to 1.5 GB of RAM and ...
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1answer
34 views

Can we find out the software components which are currently resident in the memory.

Can we find out the software components which are currently resident in the memory. If yes, how? Any command to find the software components?
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308 views

14.04 - What's with systemd-udevd? Heavy CPU and RAM usage when system idle w/o any application running

I have left my laptop on overnight for charging two video recording devices via USB. Next day I woke up, I found that there was heavy CPU, ram, and swap usage (screencap for reference). In System ...
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1answer
85 views

Can swap be used instead of RAM?

I have an older netbook that I love. It's currently using a relatively recent version of Lubuntu. The hangup is its relatively low amount of onboard RAM: 1GB. This amount also cannot be updated as it ...
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1answer
465 views

“Inactive memory” management on Linux

One of the problems that i face to many times a week on Linux is the inactive memory management. Whenever i copy a a huge file or open a program like Matlab on my Ubuntu i notice that there is a huge ...