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

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find out which memory pages are owned by kernel

I can obtain a wonderful memory map of all processes with the Linux command pmap $(ps -A | awk '{print $1}'|grep -v PID) | sort | grep \^0 It looks like ... 00007fd6dbf45000 4K rw--- ...
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MySQL memory usage - Periodically need to run FLUSH TABLES or memory usage keeps growing with large-pages turned on

After switching our rather memory + physical core rich database server to large-pages, we have noticed a small issue. The memory usage almost looks like there is some sort of memory leak. But ...
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1k views

Unusually high dentry cache usage

Problem A CentOS machine with kernel 2.6.32 and 128 GB physical RAM ran into trouble a few days ago. The responsible system administrator tells me that the PHP-FPM application was not responding to ...
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61 views

IBM Server sees half of the original RAM

We have a IBM XSeries 206M server. There are 2 2GB IBM RAM's which are suitable with the server. Normally we expect that server should see 4GB of RAM. But It works with 2 GB only. So we thought that ...
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130 views

Our RAM usage is high, including -/+ buffer/cache, but top has no answers

We are running CentOS 6 with a PHP web application. After we pushed a new version live it seems we have a memory issue, however top does not show any high usage instances. I have looked around and ...
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Determining Correct Memory For ProLiant ML115

I'm upgrading the memory on a HP ProLiant ML115 server for a client so I went out onsite today to figure out what kind of memory he needed. I figured I would make note of the model number and look up ...
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152 views

Why can't I malloc as much memory as `free` reports as being free?

The following C program allocates slices of 10MB of memory until it is killed by the Out of Memory killer. #include <stdio.h> #include <stdlib.h> #include <string.h> #include ...
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61 views

How can used physical memory exceed sum of 'resident' memory reported by processes?

Given the output of top shown below (which shows all processes currently active): how is it possible that this virtual server reports ~500M physical memory as used (used - cached, verified by free), ...
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285 views

MySQL crash when I increase max_heap_table_size value

I have a MySQL instance running on an Ubuntu 12.04 server, equipped with 120 GB RAM. There are several PHP scripts running on it, which sometimes set new mysql parameters. One of these scripts uses ...
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204 views

How can free physical memory decrease while 'Res' memory used by processes is constant?

I observe the following behavior that I cannot explain: the amount of free physical memory reported by a server increases, while the 'Res' memory reported by the most memory-hungry processes (web ...
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IBM SystemX 3400 M3 - 4GB DIMMS along with 8GB DIMMS

We have an IBM SystemX 3400M3 server with 4 X 4 GB Dimms and 1 CPU. We asked our hardware vendor for an upgrade - 2nd CPU , additional Harddisks , additional RAM. He delivered us IBM RAMs ( 3 x 8GB ...
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206 views

Apache 2.2 - how to reduce memory footprint

On my server with Ubuntu 12.04 LTS server i have Apache 2.2.22. Serverspecs: Quad-Core AMD Opteron(tm) Processor 1381, 4 cores 4 GB Ram 2x500 Harddisk in Raid 1 I have magento 1.7 running on ...
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76 views

Are there any disadvantages to unusual RAM amounts for virtual machines?

This is going to seem like a silly question, but many many years ago I somehow got it into my head, perhaps from reading an article or speaking to people 'in the know' that a computer should not be ...
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954 views

Why does my SQL Server use AWE memory? and why is this not visible in RAMMap?

We have a Windows Server 2008 R2 (64-bit) 8GB server where, according to Sysinternals RAMMap, 2GB of memory is allocated using AWE. As far as I understood, this means that these pages stay in ...
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271 views

IIS Memory management & thresholds with potential leaks

We're running some X64 Win Server 2012 webservers (So IIS 8). We're noticing that the free memory on the boxes is constantly sitting at 5-10% free. We actually run quite a lot of applications on ...
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48 views

Exchange store.exe memory spiking bewteen midnight and 6AM

I have a windows server 2003 R2 64bits SP2 with Exchange Server 2007 installed. The server has 12GB of ram and during the night, always between 12PM and 6AM, the memory usage spikes to 100% with ...
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58 views

Red Hat Enterprise Linux 4 - free -m shows high memory used in second line but no process actually uses memory

I have a Red Hat Enterprise Linux. I understand that top can show high memory usage, which is fine. free -m shows below output: $ free -m total used free shared ...
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How can I use huge pages and libhugetlbfs on a Debian EC2 PVM instance?

On my local machine (i7 9200) running Debian Wheezy amd64 I can get some significant speedups on some "big data"/HPC type stuff by: Following the instructions here to reserve some RAM for huge pages ...
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250 views

High Memory 64bit server, not using all ram

I have several high memory linux servers running centos 64bit, and after 10-20 days of uptime I have noticed on all of these servers they dont actually use all the ram available to then (they all have ...
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164 views

Linux Kernel lowmem usage

I am debugging an issue where we are running out of kernel low memory and I am trying to identify who is using the kernel low memory thats contributing to the problem. Following is the meminfo ...
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185 views

What are Linux shared memory 'segments' vs. 'pages'?

The Linux kernel docs say: shmall: This parameter sets the total amount of shared memory pages that can be used system wide. Hence, SHMALL should always be at least ...
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102 views

Trading Engine running on RHEL 5.x [closed]

Before asking question quick background about myself working at one of trading company this is my 1st job as sysadmin I have finish my RHCE no experience how production server work. In our company ...
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119 views

Why the system information message when accessing an Ubuntu server doesn't match free -m?

Each time I SSH into my AWS Ubuntu servers I see a system information message, showing load, memory usage and packages available to install, like this: Welcome to Ubuntu 12.04.3 LTS (GNU/Linux ...
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90 views

Transfer used ram to swap and free more physical ram

I have a vps with 256m physical ram and 512m swap space, I am trying to use a software that need more than 256m and less than 512m ram, so it uses swap. The problem is at some moment of the ...
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357 views

How much free memory should I have on my webserver? [duplicate]

I have a webserver that's currently hosting two Wordpress sites and some java-based collaboration software. The server has 2G of memory and is currently using about 1.8G of the available memory. ...
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Drop caches in Linux

I have an embedded Geode-based application server with 512MB RAM and I'm about to try to maximize free memory during applications workload, which uses MySQL database 5.5 with InnoDB quite ...
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How to find what is using linux swap or what is in the swap?

I have virtual linux (Fedora 17) server with 28GB RAM and 2GB swap. The server is running mysql db that is set up to use most of the RAM. After some time running the server starts to use swap to swap ...
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53 views

How Do I Know the Memory Used by Apps [closed]

Is it possible to know the memory used by any apps running on my linux server? I'm using the following command to know how much memory used by php-fpm. ps -ylC php5-fpm --sort:rss | awk '!/RSS/ { ...
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160 views

What is the difference between memtest86 and memtester?

Memtest86+ - http://www.memtest.org Memtester - http://pyropus.ca/software/memtester/ I am looking at above memory test tools. What is the difference between these two? (In what aspect should it ...
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80 views

What amount of physical RAM would a typical “commodity class” server have, as of late 2013? [closed]

I'm trying to spec out servers for my company's infrastructure group to build. They tell me anything more than 2GB is too much, which I find ridiculous considering cheap DRAM is about 15 bucks a dimm ...
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981 views

Why am I missing 4GB of RAM on Windows Server 2008 R2 64bit?

I noticed today that a server was very low on memory. It physically has 8GB installed and runs Windows 2008 R2 Standard 64bit. It also hosts 2 virtual machines using HyperV. Server is Dell ...
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Can more memory than I need slow down my server?

We're about to install a memory intensive application and will purchase a server for it. The server will have at least 4 CPUs, with multiple cores. While the application is memory intensive, the ...
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45 views

Vmstat indicates memory is disappearing

I wanted to profile the memory usage of a script. Here's the output before it was running: procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- r b swpd free buff ...
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285 views

Xen dom0 reports incorrect amount of RAM with dom0_mem set

I've done a fair bit of searching about this, but have found nothing that answers my question. I have a system with 6GB of RAM which acts as a Xen server. For reference, it runs Ubuntu 12.04. I've ...
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220 views

DDR3 10600 memory running at 533mhz

I bought a second-hand HP ProLiant DL160 G6 a year ago with 48GB configured in it. I discovered checking with cpu-z and doublechecked with speccy the memory runs at only 533Mhz. I checked the ...
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61 views

Understanding Memory Usage and Numbers in Linux

I have a web server running Apache that has some interesting numbers for memory usage. Looking at top I have the following memory information Mem: 11679976k total, 10917568k used, 762408k free, ...
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578 views

Large virtual memory size of ElasticSearch JVM

I am running a JVM to support ElasticSearch. I am still working on sizing and tuning, so I left the JVM's max heap size at ElasticSearch's default of 1GB. After putting data in the database, I find ...
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IBM rack server memory configuration for mixing 1R and 2R RAM

I am currently documenting the specifications to purchase IBM x3650 M4 server. I am going for two Quad core Intel Xeon E5-2609, 2.4 GHz, 10 MB cache and 16GB PC3L-10600 CL9 ECC DDR3 1333MHz LP RDIMM. ...
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78 views

Classic ASP apps on IIS shuts down when memory usage goes over 90%

I've got an issue where all classic ASP apps on IIS shut down, when the crowded server exceeds 90% memory usage. This is because ASP apps cannot create new sessions any longer. The ASP.NET apps are ...
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193 views

Xen VPS not reflecting the RAM upgrade using xm mem-set

I'm trying to upgrade RAM on a Xen VM without reboot. Although it looks working from the host node, the VM isn't picking up the upgraded memory. Upgrading from 756 MB to 1024 MB. Below are the ...
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163 views

How to find L1, L1i, L1d cache from dmidecode output?

How to find L1 , L1d, L1i cache from dmidecode output ? (NOTE: dmidecode file is from different server for which I do not have access, So I can not run lscpu command to find the same) ...
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373 views

HP Proliant DL320 G5 Memory Registered or Unregistered?

I have an old HP Proliant DL320 G5 with 2x 1GB of RAM. I would like to swap out the old ram and install 4x 2GB of RAM to bring it to the max capacity. The manual calls for PC2-5300 unbuffered modules. ...
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69 views

ASP.NET not seeing RAM Upgrade?

For several years we've hosted an ASP.NET 4.5 application on the same VM as a SQL Server 2008R2 database in 4GB of RAM. Performance was good. Our application is a catalog and we use .NET memory cache ...
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44 views

Postfix mysteriously stops running

My server has been experiencing this problem once every couple months: Application becomes unavailable to users Application log filled 100% disk space with an error message that it cannot connect to ...
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1answer
74 views

MySQL CPU High Usage

I got a problem with CPU usage on my VPS, mysqld use 100% CPU and my site go down, i have a small package, 512MB Ram, wich 300 is free, and my site has 1000-1500 unique visitors, and 50.000 views / ...
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124 views

Top not accurately showing memory usage [duplicate]

Top is not showing my memory usage accurately or is my VPS provider doing something strange? As you see in the picture bellow it uses 90%+ of the memory, but when you look at what processes that is ...
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Windows app not allowing debugging

I'll start by saying, I am not sure if this should go in StackOverflow or ServerFault. I posted it in StackOverflow earlier, but its been getting votes to close the question, so I assume it should be ...
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148 views

How do I configure Linux to use less memory for caching?

I have a follow up question to 377448, but not enough rep to comment there. Before I get dinged for asking the same dumb question, let me say I've been reading a lot of similar posts and answers ...
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324 views

slow website load and high memory usage

my site has been slowed down last couple of days ... some image doesn't show up ... i got 408 Request Time-out: Server timeout waiting for the HTTP request from the client couple of times which ...
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262 views

Apache MaxMemFree won't work?

I have apache MaxMemFree 150 set in httpd.conf. However, when I use htop/top to look at the apache process, it still eat 648M shown below. Did I miss anything? 16514 apache 20 0 1157M 648M ...