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

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CentOS 99% memory usage

for the past week my CentOS VPS has had 99% memory usage. [root@server ~]# free -m total used free shared buffers cached Mem: 2048 2032 15 ...
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How to decide on VPS good defaults for PHP and Wordpress when it comes to memory?

I have (only) 512MB to spare. The only thing running on my VPS is PHP/MySQL and on top of it Wordpress. No mail server or any other application, just Wordpress and LAMP stack. How to decide how much ...
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628 views

Avoid a crash when a process allocates too much memory?

Similar to this question, we have a computing server with 96GB of RAM that is used to run large jobs in parallel. Occasionally, the total amount of physical RAM is exceeded, which causes the server ...
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10 views

What is Slab, SReclaimable and SUnreclaim? What does Slab solve and how does it behave under load?

I have a server with 32 gigabytes of ram, with htop reporting 29 gigs used, with 4 gigs of swap in use as well. cat /proc/meminfo returns around 13 gigabytes of memory listed as SReclaiable. What ...
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1answer
2k views

Tomcat 6 Default Memory Allocation Settings

Does anyone know or know how to find the default values for the various memory allocation-related parameters (-Xms, -Xms, -XX:PermSize, -XX:MaxPermSize) for Tomcat version 6?
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How much memory does my SQL need?

I have a VM (SQL database server) that I think has more memory then it needs, however I'm not sure what I can reduce it to because I don't understand exactly what "In use", "Available", "Committed" ...
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52 views

HP Proliant ML110 G6 RAM Upgrade Issues

We have an HP Proliant ML110 G6 server running here at work which presently has only 8Gb RAM installed. The RAM presently in the system is Integral IN3T4GEZBIX or in other words PC3-10600 unbuffered, ...
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18 views

Dell PowerEdge C1100 Memory Configuration

I have a Dell PowerEdge C1100 server with 48GB of DRAM (12x4GB modules, two modules per channel). Now I'd like to add some memory. I do not want to buy more 4GB modules, because it will give me a ...
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SQL Server total memory less than target memory, lot of extra memory unallocated [migrated]

The situation is the following: We have a SQL2008r2 server (64bit on 64bit Windows) with SSRS installed on it. The Max Memory is set to 6GB, the server has 12GB total memory. The target server ...
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34 views

xen vm memory missing

I have an Ubuntu server with 320GB of memory. I installed xen 4.4.1 on this machine, and run 2 Debian VMs. One with +-100GB of memory and one with +-200GB. Everything worked fine, until at one point, ...
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47 views

See ECC correction count

I'm curious as to whether or not there's some performance counter that will log the number of ECC corrections required, that could perhaps be tracked as an early indicator of memory failure. I imagine ...
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38 views

How to find faulty memory module from MCE message?

I am trying to understand MCE message to find which memory module is bad on a server. This message appears in /var/log/kern.log in one server that freezes two times today. Apr 13 22:39:22 mbox ...
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1k views

Maximum amount of memory per session with IIS/.NET

I'm troubleshooting some memory issues we're running into with a heavily used ASP.NET site hosted on IIS6. Intermittently we have to manually recycle our application pool (process) to resolve issues ...
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3answers
3k views

How to increase swap space on a live server [duplicate]

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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0answers
35 views

elasticsearch glibc memory corruption

My elastic search clusters keep crashing for no reason. All I can see in the logs is : INFO | jvm 4 | 2015/04/17 19:10:09 | *** glibc detected *** /usr/java/jre1.7.0_04/bin/java: malloc(): ...
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866 views

java 7: should users be aware of changes in heap memory handling?

After installing the latest Java 7 Development Kit (Java SE 7u11) on my Windows 7 Professional 32bit PC with 4Gb RAM, I noticed I can't allocate much memory for Tomcat. Whereas these memory settings ...
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162 views

RabbitMQ keeps messages in memory (memory overflow)

I have RabbitMQ server in cluster (2 nodes). All queues are durable, mirrored and all messagess are set as persistent. I wrote application to synchronize database changes over RabbitMQ queues. In ...
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LXC container shows host's full RAM amount and CPU count

I've been using LXC containers for a few years and have recently expanded the types of applications that run inside of container environments. I'm starting to limit resources at the container level ...
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How to find memory usage of individual Windows services?

Task Manager shows the overall memory usage of svchost.exe. Is there a way to view the memory usage of individual services? Note this is similar to ...
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Proliant DL160 G6 (SE316M1) nehalem (X5550) memory requirement

Currently I stripped the motherboard to the bare minimum: a) 5 fans (fan4 not connected, optional) b) 1 UDIMM 4gb (10600U) c) vga (checked cable) d) 1cpu in slot 1 I get no post, main helath led on ...
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18 views

Systems freezes + Memory issues

I have a Hyper-V 2012 R2 server and increased its RAM to 32GB from 16GB. (for a small business). 1-2 months after the upgrade the system started to freeze seemingly randomly. Whether it was posting ...
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40 views

Possible reasons for extremely low RAM usage on a debian 7 VPS

After a fresh install of a debian VPS, my system shows very low memory being used. I am not sure if this is even a issue. But according to 'free -m' My system is using only 21MB of RAM ...
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3k views

How do I reserve RAM on the Hyper-V 2012 host partition for VMs only?

I have a situation where a Hyper-V 2012 cluster node cannot support 2 VMs when I think it should. Presently, I'm playing around with 96GB RAM, and I want to have 2 47GB VMs running (static RAM). That ...
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917 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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37 views

How to dump process in Windows Server 2008

I want to dump memory of windows process using just command line and without 3rd party tools. Is that possible if we assume that all necessary privileges aquired. Maybe it is possible to do using ...
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High memory usage (compared to wamp) and unresponsive site at times

Lately my site (with 260000 posts, 12000 images, 2,360,987 mysql rows and 450.7 MiB size) is running slow and at times not loading for many mins I installed this Debug bar plugin ...
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998 views

What does `numactl --localalloc` do?

What does numactl --localalloc do? Does it bind program allocation to only the single node that numactl --localalloc was run on? Or does it ensure that whenever the program allocates it's given memory ...
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19 views

Striped Ubuntu box - minimal memory usage

I am currently building applications with Go, and since I can deploy binaries, there is no need to install servers, databases and whatnot. My question is: How much can I squeeze Ubuntu so as to have ...
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2answers
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Confirm a memory leak by tracing “free” and “cached” in top?

I'm trying to confirm that there is a memory leak on my Linux device while in idle state (there should be no continuous memory consumption). I'm not interested in identifying the process that is ...
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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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4answers
2k views

Monitoring memory usage on Linux system

We use WhatsUp Gold to monitor all of our web servers. On our Linux servers (and much to the same degree, our FreeBSD servers) I'm having a little bit of an issue with the memory monitors. We're using ...
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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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What could cause Ruby's free heap slots to rapidly increase?

I'm diagnosing why our Rails servers seem to leak memory. In looking at New Relic today, I noticed that "Free heap slots" of our Ruby VMs seems to jump from almost nothing up to the baseline level of ...
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MSSQL 2008 r2 Express: there is insufficient system memory in resource pool 'internal' to run this query

I'm experiencing this error during the lifecycle of my DotNetNuke Installation. I've change the hosting server and now I've got a Windows Server 2012 with IIS 8 an SQL server 2008 r2 Express running ...
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5answers
37k views

Dump a linux process's memory to file

Is it possible to dump the current memory allocated for a process (by PID) to a file? Or read it somehow?
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2k views

Does Dell Poweredge SC1425 need proprietary memory?

We have a Dell Poweredge SC1425 which we're trying to upgrade to serve as an emergency backup, and having no luck finding memory that works with it. The 2gb that's in there works fine - it's when we ...
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475 views

Microsoft exchange maintenance plan kills the server every night

I believe I have a server with faulty hardware. I think it's the motherboard, because I've tested the RAM, but anyway, I'll explain what happens. My exchange server has 1 Private store (13GB), 1 ...
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3answers
6k views

VMware - persistent “Host memory status” alarm in vSphere

I have a particular VMWare ESX 4.1 host that has a very persistent "Host memory status" alarm. This is running on an HP ProLiant DL360 G7 server. The HP ILO and System Management agents don't know ...
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Non-ECC memory with ZFS: a stupid idea?

I have a new server and am planning to upgrade the paltry 2 GB of memory to the maximum of 16 GB. (Theoretically 8 GB is the limit, but empirically 16 GB has been shown to work.) Some guides advise ...
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1k views

Get maximum memory usage of linux executable

I need a shell script which will retrieve the maximum memory consumption of a linux executable. The executable may spawn child processes using significant amounts of RAM which should be included in ...
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1answer
268 views

What is the Rowhammer DRAM bug and how should I treat it?

DRAM chips are very tightly packed. Research has shown that neighboring bits can be flipped at random. What is the probability of the bug triggering at random in a server-grade DRAM chip with ECC ...
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68 views

Dell Poweredge 2970 - Cheap subsitute/compatible RAM for lab env? [closed]

I'm building a lab environment for virtualized routers, in prep for my next network cert. I have a Dell Poweredge 2970, but it only has 16G of RAM. I need to upgrade the RAM, to the max of 64GB, but ...
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55 views

How measure memory without copy-on-write pages?

How can one measure total RSS memory occupied by a set of (forked) processes, without double-counting shared and copy-on-write pages?
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404 views

order 4 allocation failure disaster

Some environment details first: Hardware: Intel Server Board S2600GZ 2 x Intel Xeon CPU E5-2620 64GB DDR3 RAM Intel RAID Controller RS2BL (LSI SAS2108) with 4TB LVM Volume made of SAS disks ...
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1answer
66 views

Swap 99% but regular memory fine

I have a 1GB VPS server. I setup 1GB of swap ram too a few weeks ago and quite often it's hitting 99% whilst the regular memory is usually 40% - 60%. Most of my sites on the server run fine and fast. ...
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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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1k views

troubleshooting out of memory error messages from mysql

we have a web application (racktables) that's giving us grief on our production box. whenever users try to run a search, it gives the following error: Pdo exception: PDOException SQLSTATE[HY000]: ...
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What is the size of shared memory page?

On Linux, for each process, I can check /proc/PID/statm file. It's numbers contain values of: Total program size, in kilobytes Size of memory portions, in kilobytes ?????? Number of pages that are ...
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12k views

After upgrading to 2008 R2 Enterprise and installing more RAM, Windows can only see 4.00 GB

(I have also posted this on technet but I'm running out of ideas) I've upgraded from Windows Server 2008 R2 Standard to Enterprise in order to make use of more RAM. The server previously had 32GB of ...
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395 views

2U rack hardware, budget but stable, what to buy? [closed]

So, I'm tasked with helping buy motherboard/CPU/ram for a 2U server, that will be brought in luggage to China. The requirements are that the hardware is reliable/stable (read: long lasting) at the ...