RAM (random access memory), either RAM hardware or software and operating system use of RAM.

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7
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7k views

Perf samples too long, lowering kernel.perf_event_max_sample rate to

My machine freezes from time to time and I can get it working back by pressing the space key. I have this problem since two weeks now, but it was just once per day max. Now it's starting to be many ...
3
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75 views

How to load entire process memory from swap quickly (linux)?

I run a bunch of CPU-hungry processes in parallel, they normally use a few GB of memory each. From time to time they allocate large amount of memory too (say 150-250GB). Usually at most one of the ...
3
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0answers
75 views

OSX Memory readings from vm_stat and Activity Monitor.app do not agree

I am trying to write a script to monitor memory status. Here is what I have so far: # Memory Usage ramactive=$(vm_stat | grep "Pages active" | while read a b c; do echo "$((${c%?}*4096/1024/1024))"; ...
3
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211 views

DDR3 SDRAM compatibility: clock speed and timings

I want to upgrade my computer’s DDR3 SDRAM, replacing the single module that it currently has with newer ones. I am wondering if I must (or ought to) stick fairly strictly to the DDR3-1333 version ...
3
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0answers
52 views

Making sure linux uses all my hardware correctly

I have a new decent computer coming my way in a week or so, and I have a few worries. I never had to care about installing Linux before as all my hardware was pretty low standard, but now I'll be ...
3
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91 views

Utilizing the full power of my workstation

I am not a gamer. Used to be, 10+ years ago. My workstation is strictly for business: Quickbooks Excel Access General Business QuickBooks is tied to a synchronization engine that is synchronizing, ...
3
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0answers
84 views

Seemingly inconsistent output from `top` re: Swap header vs. SWAP column

How should I interpret this seemingly inconsistent output from top re: swap? Running free confirms that no swap space is in use: $ free -m total used free shared ...
3
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0answers
459 views

What are valid reasons to monitor MemFree or Active as opposed to MemUsable?

How to monitor memory usage for alarming purpose talks about the reasons to use MemUsable as the proper metric for alarming on memory, however I still see a lot of instances of alarming on Active or ...
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92 views

Samba eats RAM?

I don't really know what's going on here at the moment: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1272 root 20 0 3829868 3.312g 1860 D 0.7 93.0 512:39.94 ...
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13 views

meminfo values does not add up

I am investigating a memory issue of in my system. The following is /proc/meminfo: $ cat /proc/meminfo MemTotal: 32869176 kB MemFree: 1495144 kB Buffers: 15052 kB Cached: ...
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100 views

MTRRs do not cover all 16Gb of memory on N3150

Installed 16Gb (2x8) RAM into an Asus N3150i-c (with quad-core intel braswell Celeron N3150 SoC) and having [ 0.000000] WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing 2048MB of ...
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49 views

No POST on new built desktop

I just finished building a desktop again and it will not perform a successful POST. No beeps or video either. Since my goal is a successful POST, i removed all irrelevant hardware already and am only ...
2
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0answers
98 views

Limit the size of the disk driver cache on Linux

I am running some experiments for comparing storage systems under load in Linux. To this end I want to force the file system to access the disk itself without caching too much data on RAM. How can I ...
2
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0answers
52 views

OSx Yosemite - turn on memory compression

So I noticed after manual restart( for some reason mac was freezing ) that my mac has become very slow. I checked at Activity monitor and saw that there was no memory compression at all and the ...
2
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0answers
303 views

Won't boot after inserting new RAM sticks

I bought a new pair of 4gb RAM sticks today. Thinking it'd be easy to install, I powered down, slapped them in and powered on. It wouldn't boot. Fans spin up, a couple of seconds pass then it powers ...
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0answers
140 views

Kernel task memory is not released in Mac OS X 10.10 (Yosemite)

I was working on a large Illustrator project in Mac OS X 10.10 (Yosemite) which takes up 4.5GB+ memory but after I save and quit the application, my kernel task has still 4.8GB in it and not being ...
2
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0answers
85 views

How to increase performance of Adobe Creative Suite 6 via hardware upgrade?

A friend (who doesn't have a SO/SU account) has had a licence of Adobe CS6 for some time. Mostly uses Photoshop and InDesign. He doesn't want to upgrade to Creative Cloud for the reasons such as ...
2
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0answers
121 views

Disable memory compression in Mac OS X for specific application?

Is there any way to disable the memory compression in Mac OS X for a specific application? I read how to disable it in general at Disable compressed memory in Mac OS 10.9 Mavericks? , but in my case ...
2
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0answers
50 views

Backing up software with its licenses

I have a PC which is mostly used for photo and video editing. This PC was starting to get slow and I decided I had to install some more RAM memory in it (6GB in total now). After doing that, I ...
2
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0answers
308 views

Permission to execute denied for every file in /tmp:

When I try to execute any program from the /tmp directory, it shows me /tmp/file_name: Permission denied. The same error is shown when I simply enter /tmp. The file system for /tmp is ramfs. I've ...
2
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0answers
324 views

Memory tests fail with 2 memory modules but work with either module individually. HP laptop with AMD Radeon HD 6520G

I'm getting recent memory test failures in an HP Pavilion g7-1303sa laptop (one month out of warranty :( ). The memory is the factory installed 6GB installed as a 2GG module in the top slot and 4GB in ...
2
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0answers
65 views

RAM Timing: Is CAS Latency in READ command same as WRITE command?

As far as I know and according to wikipedia about CAS Latency: CL is the delay time between the moment a memory controller tells the memory module to access a particular memory column on a RAM ...
2
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211 views

Interpreting memtest results - 0 MHz?

I have tried to install Ubuntu on a laptop width damaged Windows, and it gave me an error. After some checks, the only that give some strange results is memtest86+. I don't know how to interpret ...
2
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0answers
954 views

Macbook Pro very slow despite normal memory and CPU usage

My MBP (OS X Mavericks) with 4G RAM has been slow ever since I bought it last year, but now it's getting ridiculous with the loading symbol showing up each time I open a new tab in Chrome or even ...
2
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0answers
639 views

Not enough memory error with Microsoft Word

Friend's computer (Dell, running Windows 8 64-bit) has been getting a weird error recently; whenever he tries to open a Microsoft Word file from Windows Explorer his computer tells him that there is ...
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0answers
85 views

What controls the RAM voltage value?

Quite simply, is the RAM module responsible for generating its own operating voltage or does it just run at whatever voltage the motherboard is providing? I am imagining that it could either ...
2
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0answers
367 views

Process tree CPU history usage, process tree memory usage (aggregated) on Windows 8.1

This question is general for Windows OS, but I would like to see a software for Windows 8.1, since this is what I use. I'm looking for software, that will take a process tree (e.g. Chrome.exe ...
2
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0answers
472 views

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 ...
2
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0answers
66 views

MemTest86+ bad adresses constant despite swapping sticks, processor/MOBO to blame?

(Sorry for the wall of text, but people seem equally critical of missing details) After about 2 years without trouble, I've been having issues recently with system instability, BSODs, random ...
2
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0answers
175 views

16GB USB flash drive turned to 1GB after writing an ISO image onto it

I have a 16GB flash drive for almost seven years. It was all good before not long ago, when I tried to write a Ubuntu image onto it. I made it many times before and had no issues about. But this time, ...
2
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0answers
733 views

Computer suddenly won't detect half the RAM

I have a System76 wilp9 machine running Ubuntu 14.04 which came with 32GB of RAM installed. When I rebooted it today, it displayed a warning that the memory decreased, and now both the bios and linux ...
2
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0answers
73 views

What is exactly shown by “perf” as page-faults?

I want to count the number of disk accesses during a complete run of my script. My bash script runs 2 other executable files locally and 2 other executable files remotely. something like this (those ...
2
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0answers
256 views

What desktop computer hardware specifications are most important for database heavy applications?

I am purchasing a new personal desktop computer with the hope of improving performance for database-heavy applications (mostly data mining). I will want versatile hardware for all sorts of future ...
2
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0answers
618 views

Sony Vaio VPCEE2E1E memory upgrade issue

I own Sony Vaio laptop VPCEE2E1E and I recently upgraded RAM MEMORY from default 3GB to 4GB after that operation I'm facing serious problem with performance.Windows shows that I have only 1.74GB ...
2
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0answers
2k views

Random BSOD crashes when all RAM slots are occupied

Although I'm a long term user of other StackExchange sites this is my first question on SuperUser, so please let me know if I've neglected any community customs I am experiencing regular BSOD crashes ...
2
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0answers
396 views

Apache memory usage never goes above 5%

I'm deploying an application that uses ImageMagick into VPS server. I tested in on two different OS: Centos6 and Ubuntu Server 12.04. On Centos6, the application is working properly and when ...
2
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0answers
598 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 ...
2
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0answers
70 views

Using the heap command line tool

I am getting a crash while using libgmalloc and I get a complain which says something like Failed to VM allocate XYZ bytes Explicitly trapping into debugger!!! Now I when I encounter this ...
2
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0answers
767 views

Seagate external hard disk does not power down

When my computer is off, this external hard disk remains on, consuming power. It is permanently warm, and inside components are active (perhaps the fan?). I have a UPS for the system so a complete ...
2
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0answers
185 views

Unusual memory usage spike

Ok, on Windows 7 64 bit, I basically use Firefox to browse the web, with a DSL broadband connection.Sometimes while surfing, I see the computer slows to a crawl for a few minutes and then goes all ...
2
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0answers
78 views

How big is PATA throughput on original Macbook Air (Rev A)?

I still have one of the original Macbook Air's that I use sometimes. It's got 2Gb of RAM and whenever it's filling up and starts paging, the whole things becomes barely responsive. I've heard SSD's ...
2
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0answers
215 views

System Memory: Only half is being displayed

Using multiple tools, I have verified that my computer can "see" that 8GB of RAM is installed, but only is using 4GB of ram. I've seen this behavior with: Memtest86+ 4.20: Memory SDP Information ...
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0answers
584 views

How many RAM Hardfaults is too many?

Trying to play BF3, sometimes seemingly randomly, it will start lagging. I assumed despite 4GB of RAM, it might be hitting its max. I just however noticed a lot of RAM Hardfaults. Is this a lot, or ...
2
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0answers
224 views

Asus P4B SDRAM Upgrade

I have to fix a PC for a friend - and - bought RAM because 256 MB SDRAM PC133 is not enough for WinXP. I bought 2x 512 MB SDRAM PC133. If I insert one stick, it doesn't matter which one, the PC won't ...
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43 views

When I run this process, it pushes all others out of RAM. Is there any way to prevent this?

I like to leave my browser, email, and other applications running while I'm gaming. Now that I'm running a 64-bit version of Windows with 16 GB of RAM, I can do this easily, and even switch between a ...
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21 views

How to find processes which uses the most RAM in last X seconds?

Could you please help me to sort this out? I'm trying to write a bash script which will monitor ram usage (not only ram but cpu and network as well) and show me 3 processes which use the most ram in ...
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20 views

Install yesod with stack on a 512 MB-memory server

I'm trying to install yesod in a server running Ubuntu 14.04 with stack, running: stack install yesod-bin cabal-install --install-ghc The problem is, the system runs out of memory and installation ...
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37 views

Overclocking of Ram on laptop

My laptop have an 2GB and 4GB DDR3-1600MHz ram chip running at dual channel. Both Chips is of crucial technology. I have read in many posts that overclocking Ram can increase the performance of ...
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0answers
28 views

What kind of Non-ECC RAM does this board support?

I'm leaning towards a purchase of this CPU/MOBO combo: SUPERMICRO MBD-X9DRL-IF-B Xeon E5-2660 2.2GHz x 2 (if I think I can afford two...) Background I'm trying to figure out what kind of and how ...
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24 views

Software or Hardware?

Hi guys i have a Server 2008 R2 thats a supermicro Duel Xeon 1366 box 12gb DDR3, that i use for file storage and WDS and little Vmware Workstation 12 stuff.. The issue am having its loaded with 2 ...