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

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91 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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164 views

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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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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253 views

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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47 views

Sun Fire V40z, big gap between memory reported by dmidecode and what the Linux kernel sees

I'm looking after a V40z (a loaner), running RHEL 4.8 (no, I can't update it, it's a loaner) that according to dmidecode has 8 DIMMs of 2048M each, which makes for 16GB RAM as far as I'm concerned. ...
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247 views

Track memory usage of a job on SGE

I'm looking for some guidance in how to precisely figure out how much RAM my job is using on my cluster. My job is not multi-threaded and runs on a single cpu. When I run my job and run "top" I can ...
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785 views

How to measure dcachesize usage (and reduce it)

I have a VPS running CentOS 5.7 (Final), 32-bit. Right after boot, when I run # cat /proc/user_beancounters I see that my dcachesize usage is at about 4100000, while my VPS is set up with a limit of ...
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982 views

Process Managment memory-leak in Windows Server x64?

After clean install and boot of OS Windows x64 I launched cmd.exe (any other exe) and closed it. Then I launch rammap.exe (http://technet.microsoft.com/en-us/sysinternals/ff700229.aspx). On the 2nd ...
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32 views

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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37 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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68 views

Amazon ec2 - Error occurred during initialization of VM Could not reserve enough space for object heap

I don't have any experience of working with servers, so please explain your answer in detail or provide a link to support your answer. I want to restart server and executing command for that gives ...
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59 views

Server hangs when copying files, importing db etc

I'm running centos with Plesk ( kernel kernel.x86_64 0:2.6.32-431.11.2.el6). We upgraded to 48GB. Currently we are experiencing strange problem. Whenever we try to copy some file, import database, ...
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40 views

Monitoring and reporting on page faults to determine memory issues

I'm in the process of configuring a performance monitor(s) against all servers in my domain. I'm using WhatsUp Gold 16.2 to send an alert when we reach certain thresholds. I recently read an article ...
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36 views

Hardware configuration for head nodes (HDDs, memory, processor, redundancy)

I'm designing a head node whose primary function is to submit jobs to the Torque/Maui scheduler and secondary function is to run test jobs. Unfortunately, most hardware selection guides for clusters ...
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44 views

How to use kexec to do a live upgrade of hotswap ram on a CentOS vm image?

Just as the question states, is there a way and what's the best method todo a live ram upgrade with kexec?
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57 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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30 views

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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84 views

High CPU load by system during slow memory allocation to a process

I encounter an issue on one of my server (centOS 6.4 with kernel 2.6.32-220.7.1.el6.x86_64). Let me explain it : when I run 4 processes (let's call them p4), I saw that memory allocated to them ...
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156 views

How to read the address of the XSDT table, as provided by `acpidump`?

I want to access Physical memory in BSD. acpidump -t XSDT > xsdt_dump.asl it is giving: /* RSD PTR: OEM=ALASKA, ACPI_Rev=2.0x (2) XSDT=0x9aae8070, length=36, cksum=164 */ /* XSDT: ...
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435 views

udisks-daemon eating up all my memory

I'm operating a little storage server on debian, over the past months I've noticed the process udisks-daemon eating up almost all available memory. Is this just really aggressive caching or a memory ...
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116 views

Limiting memory usage and mimimizing swap thrashing on Unix / Linux

I have a few machines that I machine that I use for running large numbers of jobs where I try to limit the number of jobs so as not to exceed the available RAM of the machine. Occasionally I ...
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399 views

High load average, low CPU and IO (Centos 5.7)

A Drupal 7 site with CiviCRM, after running smoothly for a year on a 1&1 VPS suddenly became unresponsive. Now pages eventually load, but can take more than a minute. Looking at resource use in ...
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151 views

Should I consolidate multiple identical VMs into BSD jails?

We run a number of Openfire XMPP/Jabber servers. Due to the way Openfire works, we cannot easily run multiple Openfire instances on one server, so I have 5 identical VMware ESXi VMs, each with CentOS, ...
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174 views

what is the default size of jvm heap when using maven to create jvm?

I am using the server started by the following command. mvn jetty:run i want to stop the server, but i failed to run mvn jetty:stop, even faild to run java -version, why? [mirror@home wpse]$ mvn ...
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159 views

Mounting shared memory in XCP/ XEN Server,for storing VM

Requirement vm with 2HDD each 1gb OS will be installed on hdd 1 and required data on HDD 2 I want all my VM running on Xen Cloud Platform XCP 1.1 to use /dev/shm of host machine for HDD1. Is ...
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186 views

Set total memory limit with Torque

I run a moderately sized cluster and I am having a queue problem. For example I have a node with 128GB of memory and a program that I set the amount of memory per core. So for example if I set memory ...
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48 views

Acceptable memory limits on a VOIP, MySQL and HTTP server

I'm currently running a Mandriva(Linux) server with fairly low memory (1GB). At the moment the specs are looking like this(it currently is used for VoIP(sip), MySQL and HTTP): freememory total ...
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37 views

Are memory and thread managers on Windows Server 2008 R2 and Windows 7 Home/Prof/Ultimate same?

I was asking one question on DBA site, and I got a reply, that implies, that Windows Server 2008 R2 and Windows 7 Home/Prof/Ultimate have different memory and thread managers. Is this correct?
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133 views

Linux FOG Server Memory

I'm a computer tech at my high school, and our technologically-superior head just got fired. He just set up a Linux FOG server before he left, and we have to re-image all the computers in the school ...
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190 views

Tracking huge buffer usage under Linux

I'v a Linux server running under Debian Lenny with 4Go of RAM. It doesn't run a large number of stuffs: Postfix/spamassassin (daemon mode) Bind9 KVM (one guest - 1Go of RAM for it) Every day at ...
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289 views

strange memory usage pattern on windows server 2008 on login through remote desktop

I'm running Windows Server 2008 Datacenter Service Pack 2 on a VM Ware instance with 10Gb ram allocated. I'm not running IIS or SQL Server. Under 'normal' conditions, the machine uses ~5.5Gb of ...
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379 views

sql server using all the memory on the box and throwing timeouts on pedestrian queries

I have max memory set. But at least 1 time a day the Sql Server hits over 95% of the ram in the box, and page faults for more. In the meantime the website is throwing very obscure timeouts on simple ...
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34 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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20 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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9 views

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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30 views

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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11 views

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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23 views

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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20 views

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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113 views

Docker memory leak?

I'm running Docker 0.9.0 uname -a Linux 3.11.0-18-generic #32-Ubuntu SMP Tue Feb 18 21:11:14 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux I have 40 containers running at once. Each container is fairly ...
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0answers
16 views

Cluster Manager Ignoring Config File

I have just setup my first cluster manually (not using the auto install) and it all works great. I have 1 SQL node, 2 data nodes and 1 management node (all on separate machines). I intend to port ...
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27 views

Why would Memory\Available Bytes go down, even when Virtual Memory used is constant?

I have a long-running application that continually loops through video files. It runs for some hours, and then a message box appears along the lines of "The system is running low on memory...". I've ...
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74 views

How can i get Windows XP 64bit pro to recognise memory?

Looking for some help. We have a computer running Windows XP Pro 64bit SP2 (supported till April lol). It is dealing with lots of video feeds in our organisation and it only had 4gig of ram. So in my ...
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15 views

RApache memory usage

I have a server with ubuntu 12.04 and it is installed Apache, PHP5, MySQL, and Apache module called RApache. I am working with grid data is processed dynamically. Each time the user makes a request ...
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58 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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107 views

Disabling locked page allocations in SQL Server 2012

Locked page allocations are enabled in my instance of SQL server 2012 even though I have no accounts with the "lock pages in memory" user right. This article by Microsoft - ...
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268 views

MySQL (MariaDB) crashes frequently

I recently migrated an old server running MySQL to a new VPS running MariaDB 5.5. I don't have too much running on the server (just a few PHP sites) and free memory seems to be OK, but the DB keeps ...
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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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22 views

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 ...