Synonym for: RAM - Acronym for: Random Access Memory, a type of computer data storage.

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Automatically Kill/Restart Process(es) When Memory is Critically Low

I have a Debian Wheezy VPS box where am running a couple of Django apps in production. Ideally, would have tried addressed my current memory footprint issues by optimizing the apps, adding more RAM or ...
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RedHat 5.5 server does not show per processor memory utilization [duplicate]

I have been searching all over internet but not finding any leads. I have a system with a memory leak that I am trying to troubleshoot. Unfortunately I am not able to see per processor memory ...
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32 views

High load of RAM but low CPU

I've a dedicated problem.. When I make a load test with ~500 connections, CPU stay low (about 30%) but memory grow up fast ! And I have a 100% used RAM and 50% used SWAP.. An other dedicated with 2x ...
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22 views

Windows 2008 R2 Memory Management [on hold]

How does Windows manage physical and virtual memory? As I understand it, once the system fully utilizes physical memory, it will engage virtual memory. How is virtual memory managed? If physical ...
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43 views

What happens to a random bit error in the cache on an Intel CPU?

I have a system with ECC RAM and a Xeon E3 CPU. My understanding is that ECC circuits on the RAM will detect corruption from random bit errors in the RAM chips. But what happens to random bit errors ...
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39 views

Traffic increase causes VPS to crash due to RAM utilisation

I have a VPS which runs multiple Opencart sites and for the most part performs the task very well. Spec: CPU GenuineIntel, Intel(R) Xeon(R) CPU E5-2665 0 @ 2.40GHz Version Parallels Plesk Panel ...
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72 views

plenty of ram but still swapping

this is graph of my server ram you can see in graph that every time I restart mysqld, swap becomes zero. But increases over time. If i put innodb buffer pool in large size swap rises faster and if I ...
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27 views

vSwap vs Burstable RAM for OpenVZ

What is the big difference between vSwap and Burstable RAM? Does vSwap create and cause I/O by using disk? I know SWAP will use the disk so is vSwap the same as swap just virtualized in the ...
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134 views

How to free linux memory safely to improve server performance

We have a linux virtual server hosted through GoDaddy, and our site has been running slow recently. I poked around the server a bit (I am not a sysadmin and have very limited experience with linux, ...
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854 views

What RAM options do I need to know before buying Server RAM?

This is a proposed Canonical Question about Server Memory. I have to buy a Dell R420 server and there are various combinations (1600 and 1333 MHz RDIMMS and UDIMMS) and Performance Optimized vs. ...
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29 views

(VMware) Will a Linux guest VM swap when RAM usage is high even though Active is not?

We are currently having a discussion in my environment. The assumptions are that “The tools that are designed for a physical infrastructure memory management in Linux such as top, free, vmstat, ...
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58 views

Memory used by unknown processes on OEL6 - without cache and slabcache

I've searched through "Where is my Linux memory?" questions, but I couldn't find a similar scenario for my kind of leak: OEL 6.3 x86_64 Linux with 6GB of RAM without any of my main components ...
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43 views

Out of memory kill on Centos 6

For the last few days I am having regular out of memory problems on my Centos 6 server. Aug 1 03:40:42 myserver xinetd[2304]: START: smtp pid=11222 from=87.109.36.82 Aug 1 03:40:46 myserver ...
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46 views

Apache2 using up all my memory and stalling my wordpress instance (mysql)

Environment Ubuntu 12.04 / 1GB RAM / 40GB DISK / 1 CPU (RACKSPACE) Wordpress 3.9 mysql Ver 14.14 Distrib 5.5.38, for debian-linux-gnu (x86_64) using readline 6.2 Apache2 mod_php5 mod_rewrite When ...
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54 views

Where did my memory go on linux (no cache/slab/shm/ipcs)

This is a headless server with 8GB RAM (kernel 3.12)... even after only a few days, i get low on memory. in fact, this server has OOMed a few days ago... something is losing memory, but i don't know ...
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71 views

Redis server Memory Increased to 22GB and Crashed (OOM)

A redis server v2.8.4 is running on a Ubuntu 14.04 VPS with 8 GB RAM and 16 GB swap space (on SSDs). However htop shows that redis alone is taking up 22.4 G of memory! I do not think the redis ...
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Lots of major page faults in CentOS

We have a fairly complicated PHP script that's generating a lot of minor and major page faults. $> ps -o min_flt,maj_flt,time,cmd,pid 4686 MINFL MAJFL TIME CMD ...
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PHP eats up all the memory

Since this morning one of our webserver's memory getting filled up by php which eventually going to cause the server to start swapping, slow down and become unavailable (an ssh login takes like 5 ...
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32 views

Is memtester a good command line memory test?

I have spent awhile looking for a memory testing tool that works from the command line, and have been unable to find anything besides memtester (http://pyropus.ca/software/memtester/). Eventually ...
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232 views

How to increase swap space on a live server

On Ubuntu 14.04, the swap file has to be increased as the memory and swap usage are reaching 100% usage. On a live production server, can the swap be increased with minimal disruption to the service? ...
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27 views

Interpreting ipmitool ser list memory errors

I'm purchasing some second hand servers, which the seller has given me remote access to. Running ipmitool [..] ser list, they seem clean other than these repeated a few months ago on each: [..] | ...
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What exactly is a “SWAP FILE” when dealing with RAM in a Linux machine? [duplicate]

What is a swap file and what does it do? How do it increase the RAM and are there any downsides? Why use swap file vs. getting more RAM? Does swap file hurt the CPU IOPS? I understand that it some how ...
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49 views

What is using all of my memory on Ubuntu 12.04?

I keep getting alarms from Rackspace telling me that my memory usage is too high, but I can't seem to find the culprit. I ran top SHIFT + M to see top output sorted by memory, and this is what I get ...
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Windows Server 2012 - What type of memory do I have? [duplicate]

My Windows Server is running on 3gb of memory right now, and I would like to upgrade to 16gb. However, I don't know what type of memory to buy. I know that the notches in the physical RAM are ...
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152 views

Growing OS cache in RAM causing high system CPU usage

Long question, so please bare with me: I'm having a weird issue with a server that I've never seen before. On a machine with ~30G of RAM with an application that takes ~10G (spread across hundreds of ...
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63 views

Cisco 7604 router runs out of memory when loading the IOS image, yet runs a different image with similar reqs

I am experiencing an unusual memory issue with a Cisco 7604 router, specifically the memory on the Supervisor Engine (SUP32-GE-3B) and how it pertains to IOS requirements. I was preparing the router ...
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233 views

HP Proliant DL360 G7 All DIMM indicator lights amber

I am currently doing a RAM upgrade on an HP proliant DL360 G7 server. After installing the new RAM (18x 8GB KTH-PL316E/8G) the LED indicator lights for every single DIMM turned amber and the health ...
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26 views

How much RAM size I will require for VPS hosting on basis of my website [duplicate]

My website is currently on Blogger(.com). Now I am planning to purchase VPS hosting from GoDaddy, I have figured out how much disk space and bandwidth I will require but I am unable to decide the RAM ...
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44 views

Startup Memory in Hyper-V dynamic Memory for IIS 7.5

I recently setup a 2012 server core with hyper-v. I then installed server core 2008 R2 as a client. Installed IIS and started hosting an internal website. I started running throughput tests and found ...
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40 views

PowerEdge R210 Memory Upgrade

I have a Dell PowerEdge R210 II running with 2GB of memory. I wanted to upgrade the memory to 10GB as I am running ESXi on the machine. I purchased an ECC RAM (2 x 4GB) which allows me to get the RAM ...
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Tomcat Memory - Setting in setenv.sh not respected

I have Tomcat 7.0.35 on CentOS. I have configured setenv.sh to have the following: export JAVA_OPTS="-Dfile.encoding=UTF-8 -Xms128m -Xmx1024m -XX:PermSize=256m -XX:MaxPermSize=512m" However under ...
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Server setup hardware configuration for performance [duplicate]

We have developed an application using .Net ASP.Net MVC 4, SQL Server 2008 R2. Now we need to host it in a client environment in Sweden. So far we have developed in our local machine and now we are ...
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How can we calculate a processes' contribution to “commit” (/proc/meminfo “Committed_AS”)

We are seeing a "leak" in "commit" over time, and need to track the offending process(es). RSS ("used" memory") isn't leaking, but the commit is, and its causing the kernel to behave very cruelly ...
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lxc - java out of memory issues

I have a set of virtual machines on lxc container that run Ubuntu 14.04. All share same host and some of them are currently experiencing problems with java. Running java -version throws OutOfMemmory ...
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centos + php leak memory, but where?

I have a big php cronjob that run every 20minutes. After each execution the RAM memory used by the virtual server increase and not properly free once the script is terminated! But why? The memory ...
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115 views

CentOS only detecting 50% of ram on IBM Server

I have IBM server with 16 GB RAM installed. Initially it showed 16 GB with free | grep Mem | awk '{print $2}' but now it shows only 8116136 but it must show 16439208 When I do dmidecode ...
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How does vm.overcommit_memory work?

When I use the default settings: vm.overcommit_memory = 0 vm.overcommit_ratio = 50 I can read these values from /proc/meminfo file: CommitLimit: 2609604 kB Committed_AS: 1579976 kB But ...
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xen: domu require more memory than mem-set size

Assume that we have install two guest os in xen, named dom1 and dom2. Now, I start the dom1 and dom2, and both are configured with max-mem=4096M; note that my physical memory is 16GB. While dom1 and ...
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57 views

Unusually high nfs_inode_cache

My server is experiencing a high usage of nfs_inode_cache = 11G , im trying to figure out what's consuming all this , i know already that directories with large numbers of entries and deep directory ...
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2answers
55 views

Unexplained high memory usage [duplicate]

My server started being unable to spawn PHP instances to respond to HTTP requests as there wasn't enough available RAM. Free -m shows a reasonable amount left, but top and PS don't seem to be able to ...
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276 views

Dell R610 memory configuration for all 12 slots

I purchased 12 sticks of RAM on eBay to go into a Dell R610 server. The RAM is ECC REG PC3-12800 DDR3-1600 yet when I occupy all 12 slots with this ram I get the following error on boot: MEMORY ...
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Why does oracle vbox virtual memory differ when VMs do the same thing and are clones of each other?

I am running a large box with 11 instances of 64-bit Ubuntu 14. MemTotal: 50 Gb CPUs: 8 CPUs are pretty much 100% all day long. Memory is at about 60%. Swap not getting hit. Little bewildered by ...
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How should oracle vbox look like in terms of Memory, CPU and Performance? [duplicate]

I've got a need for a ton of VMs to simulate some realistic load testing scenarios. I've got a bunch of different host machines that differ in ram, cpu's, etc. What should my resource manager look ...
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lvresize: command not found - RedHat

No search results on google for this. So i am really confused now. I am trying to increase the swap space and lvresize says command not found. Please Help !! using RedHat 64bit
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TCP Server Memory management: #Connections Vs. #Requests

Given that, there is no theoretical limit to number of concurrent TCP connections a Windows 2008 server can handle. Only thing will happen is, with each connection there will be memory consumption in ...
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Mysql crashing, oom-killer, out of memory, tuning issues?

I just moved all of my websites to a new server with 4GB RAM. Almost immediately, mysql started crashing, and at one point, didn't reboot which caused a major outage (since I didn't notice until ...
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Loading a big database dump into PostgreSQL using cat

I have a pair of very large (~17 GB) database dumps that I want to load into postgresql 9.3. After installing the database packages, learning more or less how to use them, and fiddling around a little ...
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False flag multibit errors on highest populated DIMM socket on second CPU of Sunfire x2200. Faulty CPU or faulty motherboard?

I'm testing 2GB ECC Registered DIMMs in a Sunfire x2200. Recently the system event log (SEL) began logging Multibit Errors on the highest populated DIMM socket on CPU1. With 8 DIMMs on CPU1, the SEL ...
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In a HP server, can low voltage DIMMS and standard voltage DIMMs be mixed?

We are adding RAM to a HP Proliant DL380 G7 and were shipped standard voltage DIMMS. We have pre-installed some low voltage DIMMS. Is it acceptable to mix DIMM voltage in general? Is it advised? A ...
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Why drop caches in Linux?

In our servers we have a habit of dropping caches at midnight. sync; echo 3 > /proc/sys/vm/drop_caches When I run the code it seems to free up lots of RAM, but do I really need to do that. ...