Memory management is the act of managing computer memory at the system level. Questions tagged with Memory Management can cover Applications and Operating Systems

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Windows 2008R2 raising low memory events when 50GB of RAM is available

Observed Windows 2008 R2 is generating KernelObjects\LowMemoryCondition events when there is 50GB of RAM available and all processes are using just around 18GB. Not able to find the reason why ...
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31 views

Prevent a closed source chosen process from swapping on Windows [duplicate]

When I run VirtualBox If I don't use VirtualBox for some time and then I come back to using it the virtual machine runs very slowly, obliviously all subsequent operation go enough fast. How I can ...
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2answers
3k views

Where are Page tables stored

My question is "where are the page tables stored: in physical memory (RAM) or as some data structure in User space". PS: What I have understood so far: A process memory layout has few segments ( ...
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2answers
768 views

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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0answers
89 views

ReadyBoost : How a Software Component Helps Boost the System Performance by Exploiting Flash Memory as a Cache?

One of the nice feature of windows 7 for low memory system is ReadyBoost, a software component that uses flash memory as a cache to actually speed up the the performance(Ref-Wikipedia). But If we ...
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394 views

99% used memory, but 70% of unused allocated memory and 97% swap available: what can I do?

In a server with 48GB of RAM, when I run top, I see that less than 500 MB are free (1%), whereas when I sum up the column of % of memory used by each process, it is around 30%. Since only the 2.7% of ...
0
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1answer
116 views

Is CPU cache (L1 - Ln) equal to TLB

If we are talking about CPU cache. Is Ln synonym for saying 'TLB (translation lookaside buffer) of type Ln' or does Ln include also somethin else than just TLB?
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2answers
477 views

Sources of Linux memory usage not in /proc/meminfo

I’m running a Linux server that shows weird patterns in memory usage that I’m trying to investigate. During normal operation, around 200MB of memory are used for applications according to munin, but ...
9
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1answer
2k views

Which files are cached by linux?

I understand that linux uses unused RAM to keep some files cached. But I wonder, which files it actually caches! If you take a look at free : Gesamt Belegt Frei Gemeinsam Puffer Cached Speicher: ...
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1answer
88 views

memory mapping to physical ram (hardware)

When the memory management unit translates a logical address to a physical address using the translation table, how does the physical address get mapped to that address in ram. What I mean to say, is ...
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0answers
131 views

Windows 8.1 Waiting Lock Pool Tag FLwl - High Memory Usage

I am running Windows 8.1 with 8gb of ram and have lately been experiencing crashing issues with windows explorer when RAM utilization is over ~73%. I have run poolmon.exe to see if there are any ...
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409 views

PCI Express BAR memory mapping basic understanding

I am trying to understand how PCI Express works so i can write a windows driver that can read and write to a custom PCI Express device with no on-board memory. I understand that the Base Address ...
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1answer
981 views

Windows - How can I flush modified memory?

This is a follow up on my previous question, here: Windows modified memory without a pagefile - Super User I have no pagefile and a lot of modified memory according to resource monitor (Win 7 x64). ...
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1answer
265 views

Windows modified memory without a pagefile

How does Windows' modified memory work without a pagefile? The physical memory is modified and then...? I'm running Windows 7 with 16GB of RAM and no pagefile. I have about 2.5GB of modified memory, ...
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2answers
592 views

High Disk Usage while cleaning out “modified memory” on Windows 8

I am looking at the resource monitor tool of Windows 8. After closing a VMWare-VM, the "modified memory" jumps from 16 MB to 2GB. It slowly goes back down to 16 MB. While going back down, the disk ...
13
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1answer
826 views

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 ...
2
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1answer
4k views

Limit memory allocation for process

I am running Windows Server 2008 R2, and I would like to limit the allocated RAM memory space for a specific process, I have installed "Windows System Resource Manager" but I can only view the ...
0
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1answer
119 views

How is HDDM (not RAM!) accessed, modified and addressed in modern computers? [closed]

Warning: yeah, I know that article of Wikipedia. It's just too difficult for me! I hope that there is some person who could explain it more simply... Background: I designed a 6-bit computer. It has ...
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0answers
36 views

What is the name of the range of cells that are actually loaded into memory in Excel?

I keep thinking it's called Visible Range but I doubt that's actually it. Basically I'm trying to find out what the cells that are selected when you press CTRL+Left Arrow is called.
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1answer
442 views

Find out the sum of memory hogging process

As I'm always without memory on my PC I'd like to find out once for ever which is the most memory hogging program. The problem is that opening the task manager (I'm on Windows 7) doesn't seem to help. ...
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2answers
3k views

How to activate swap on Linux? “swapon -a” doesn't seem to work?

My computer has quite some memory (6GB) which is enough for most of what I do. A while back I was messing with my swap, turning it on and off with sudo swapon -a and sudo swapoff -a. In then end I ...
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3answers
1k views

Windows 8 and memory consumption [closed]

My current system should have enough memory (4GB), but it's the lower average right now and if I want to run multiple applications at once - which is needed - memory is getting scarce. In addition to ...
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1answer
304 views

Memory usage classification under Darwin (Mac OS X 10.8)

on Mac OS X using Memory Clean, I can behold this memory usage stats chart: While the meaning of active and free seems to be clear, what do "wired" and "inactive" memory refer to?
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1answer
402 views

Python - Releasing/replacing a string variable, how does it get handled? [closed]

Say i store a password in plain text in a variable called passWd as a string. How does python release this variable once i discard of it (for instance, with del passWd or passWd= 'new random data')? ...
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2answers
49 views

8 or 12 gb when dealing with mat

I had a huge problem with my computer BSODying all the time and all the times it seemed to be a memory problem. I have 16 gb RAM (4*4) and checked each of my modules individually with memtest86 and ...
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0answers
97 views

SQL Server Continues to Swap RAM After Using a Virtual Machine

I have a dev computer running Windows Server 2008 R2 Enterprise and SQL Server 2008 R2 Enterprise, with 8GB of RAM. As I write code and use the database, SQL Server will use more-and-more RAM (which ...
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0answers
622 views

Random freezing caused by khugepaged?

I have a fairly beefy Arch Linux computer, kernel 3.7.7-1-ARCH. However, recently it's been having random freeze ups. Never common, but it'd freeze for a good 15 seconds where no program is responsive....
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1answer
98 views

Sharing RAM/G5 Desktop/iMac [closed]

I have a Mac G5 Desktop with 14GB of RAM installed which I sometimes use as a start up disk. I have a 27" iMac 2.8GHz Core i5 with only 4GB of RAM installed. Is there anyway I can access/utilise the ...
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1answer
55 views

When Should I Upgrade My AWS MySQL Server?

We have a server system that currently consists of 1 Apache server that is attached to a load balancer and one MySQL server that is by itself. Both servers are AWS Micro Instances. Everything is ...
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1answer
518 views

How does FileStream appends physically works?

I was dealing with a prepending problem and suddenly leads me to think about this question.... Maybe not only related to FileStream, I want to know how we actually appends binary into a file ...
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0answers
906 views

Kernel OOM killer been called when plenty of memory left while using malloc

The program is a memory exerciser that request multiple chunks of 512MB to malloc. For some reason the node 0 is been memory exhausted while the others are not been called. MemExerciser cpuset=/ ...
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2answers
936 views

Empty/dump modified memory to pagefile in windows

I use process hacker to clear out a few gigs of ram before loading large files such as 2GB stack traces so that everything does not freeze up for an hour as stuff gets swapped back and forth. However ...
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1answer
85 views

Windows7 issue in mutli- tasking and memory

I seeming some problem in my windows OS recently, let me first say my system configuration. processor - Intel(R) Core(TM)2 Quad CPU Q8400 @ 2.66 GHz Installed memory (RAM) - 4.00 GB (3.00 GB usable) ...
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1answer
6k views

Windows Word says, “There is insufficient memory or disk space. Close extra windows and save your work”

While pasting an image in a Microsoft Word Document, I got this error message: I was only having Microsoft Word, Windows Paint, Google Chrome and Windows Explorer open at that point of time - ...
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2answers
5k views

What is Paging in memory management?

I was just reading Operating System Principles by Silberschatz et al when I came across paging in memory management.I'm slightly confused about it. It states that Physical Memory(I assume it's RAM) is ...
4
votes
2answers
407 views

About memory cache of Linux

I'm running a python script to do some statistics and the actually memory which used is low,about 10%.And no other process cost more memory.However,when i use free -m and it shows that almost 95% ...
4
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1answer
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Why does limiting my virtual memory to 512MB with ulimit -v crash the JVM?

I am trying to enforce maximum memory a program can consume on a Unix system. I thought ulimit -v should do the trick. Here is a sample Java program I have written for testing : import java.util.*; ...
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0answers
82 views

Forcing suspended jobs to swap all memory in Ubuntu

Is is possible to suspend a job and force all of its memory to swap? I've got six jobs running, and they're competing with each other for resources. So much gets wasted on system swapping that they ...
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1answer
979 views

Is there an easy fix to this copy/paste into Excel error?

When I attempt to paste a large spreadsheet (from a DB, ~90,000 rows) into Excel, I keep getting this error: Microsoft Excel is waiting for another application to complete an OLE action I ...
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1answer
1k views

How can I configure Firefox to assume I have less memory?

Firefox has a few different settings that automatically get tuned based on the system ram. This is all great if you're running nothing besides Firefox, but when you're running half a dozen apps at the ...
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vote
1answer
1k views

High RAM usage by Windows 7

I am running 64-bit Windows on an 2.2GHz 2nd generation i7 and 8GB of RAM. When I first boot up, the RAM usage is 25-30%, which is reasonable, but after about two to four hours, it may go up to 70-80%...
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1answer
784 views

Windows server 2008 CPU load balancing

I have a Windows server 2008 CPU and Active Directory installed. Some how with lot of users and compiling process and many things, the CPU load rise too much and makes the server goes slow. What is ...
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1answer
18k views

Swaping, Paging, Segmentation, and Virtual memory on x86 PM architecture

Well, this may seem a common or already asked question but after searching various books, online tutorials and even here on SU, I am still puzzled at how these four beasts work together on a x86 ...
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1answer
152 views

Mozilla Firefox is eating up my machine memory even when there's only one tab

Check out this video link; it proves that Mozilla Firefox continuously increases the size of memory consumed every moment.. What's the matter?
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1answer
287 views

Limit the number of inboxes loaded in Thunderbird to save memory? [closed]

I have 3 email accounts I use in Thunderbird, however I only use one of them on a regular basis. Is it possible to selectively load accounts in Thunderbird to save memory? Here is the ...
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votes
4answers
32k views

How could I limit or even disable file cache on Windows Server 2008R2?

There is a machine, with a very fast RAID array, and a fast internet connection. But, it only got 8gb of mem, which runs out really quick, when the upload goes up. Any ideas how could I disable, or ...
2
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1answer
494 views

Java: compile and run hanging at command prompt

I'm having an issue that I'm hoping someone can help with. I'm working on netbook running WinXP Pro SP3, 1.6GHz & 1GB of RAM. I've got a relatively simple java program that I'm able to ...
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1answer
178 views

What resource am I lacking? Causes notepad to be missing menu, or programs to not open

At this point when a notepad window is like that with no menu, I can't open another notepad either. After closing one or a few cmd prompts. Or after closing an add/remove programs window, or a ...
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3answers
3k views

Is it possible to make the OOM killer intervent earlier?

I try to tweak my development system to maximal reliability. I disabled swap, because for GUI usage it mostly renders the machine unresponsive in such a way not useable anymore. Nevertheless, if ...
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2answers
4k views

“Empty Working Set” option in RAMMap

What does this option basically do? Does it free the unused memory? If so, how does it affect the performance? In what cases will I use it?