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

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DIMM rank interleaving mechanism

I read this about rank interleaving: http://frankdenneman.nl/2015/02/20/memory-deep-dive/ Interleaving is continued from interleaving across the channels to interleaving across the ranks in a ...
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1answer
125 views

Total ram usage more than sum of ram usages

Top reports that the system is using 93% (7.2GB) of the total 7.6GB RAM. However, the sum of all running processes as calculated below is 2.2GB! What is wrong? Could be something to do with the fact ...
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55 views

Nginx + php5fpm benchmark (with AB) and performance increase

I have a Webserver in a Debian wheezy VPS with 8gb SSD, 2Gb RAM with a Dual Core Intel processor. Web service is Nginx (2 worker_processes), with php5-fpm + mysql. I'm currently doing some website ...
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1answer
65 views

what are correctable errors in DIMM and what causes them? How to avoid them?

I could see some correctable errors in DIMM. What are these correctable errors in DIMM and what causes them? How to avoid them?
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2answers
177 views

PHP OPcache is resetting cache automatically

I started using the built-in PHP OPcache of PHP 5.6 and am facing a problem now. I set it up to use up to 1 GB of RAM, which is highly enough for my websites but it never get get it to use the full 1 ...
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3answers
543 views

Diagnosing “File” tag memory leak in poolmon.exe on 2008R1SP2

We have a memory leak plaguing many of our 2008R1SP2 file servers. The "File" non paged memory tag in poolmon.exe will leak until shared folders are no longer available, and then RDP goes down with it ...
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0answers
186 views

Limit amount of allocateable memory for process

I've got a windows service written in C#, that does some heavy work (irrelevant for the question) running on a remote machine (Windows Server 2008). Every now an then a client application contacts ...
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15 views

AWS Tomcat server memory is too high [duplicate]

My application is running on REDHAT 6.0 on Tomcat 8. Sometimes memory usage is 100% when my application is used by 30 users at a time Server Configuration Details Machine ec-2 M3 Medium on AWS RAM :...
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1answer
133 views

nodejs with nginx proxy , memory usage

I use nginx proxy to nodejs app (express) , I found the memory usage is bigger than other php app, I'm new to nodejs please help me review does these config and stat normal or something wrong? # ps ...
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1answer
43 views

When setting apache MaxClients, account only for Apache RAM or PHP too?

Advice I've found on the internet recommends calculating your Apache MaxClients based on how much RAM your average Apache process takes up. Just glancing at top, for my site that seems to be around ...
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1answer
35 views

Installing new memory purchase 1 set of 6x4GB or 2 sets of 3x4GB?

I have a server that is old and has a maximum per stick limitation of 4GB (240pin) per stick of memory. There are 6 slots. (This question is not specific to: 6 sticks or the maximum memory per stick ...
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20 views

Server Recommendation for static pages only, Apache Nginix Ram [duplicate]

I have a question about setting up a new server that will be have millions of hits per day. There will probably be a max of 3 million a day with spikes up to 10 million. All the files will be static ...
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0answers
23 views

Calculate CPU cores and RAM needed [duplicate]

In case you have a Linux cloud server and it's obvious that it's not using all resources assigned to it, is there a magical formula to calculate how many CPU cores and how much RAM I really need ...
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2answers
340 views

free reports bogus amount of swap used

The swap used reported by free is very high. [root@rhel6 ~]# free -m total used free shared buffers cached Mem: 9892 9537 354 0 ...
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0answers
31 views

fix high dentry_cache usage

I am having the same issue as described here: how to find out what is causing huge dentry_cache usage? I am having to open a new question as I cannot comment yet, sorry about that. My question is ...
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0answers
309 views

Node.js Server with PM2 Crashing with error ENOMEM - but no memory leak

I have an EC2 instance running a node.js server (Express based). After deploying in a new environment, my service had started crashing almost instantly with spawn ENOMEM Errors like this one: ...
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1answer
99 views

SBS 2011 Exchange 2010 Store.exe DB using 20GB with only 13 users? [closed]

I have read up all the information there is about the store.exe (exchange db) utilising tonnes of memory, but I haven't found any reference guide as to how much of it is actually worth using per user. ...
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76 views

Xackup Backup Type for Xen Server 6.5

I'm running the Xackup trial and started backing up a few linux and windows VM's. I selected disk and memory state as the type of backup. Everything ran fine and backed up ok. When I went to edit ...
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45 views

NAUbackup features + Snapshots

Does anybody know whether or not NAUbackup captures the memory of a vm, along with the disk, when it takes a snapshot? I'm running xenserver 6.5 on three blade servers and I setup NAUbackup to backup ...
2
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1answer
94 views

What memory settings aside from page file size are significant for debugging performance issues on Windows Server 2008

While debugging a problem with slow hg cloning from Windows clients, I found that hg clone performance could be significantly improved (10x faster) on EC2 2012 virtual instances by reducing the ...
0
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1answer
118 views

Dell PowerEdge R710, Dual Xeon E5630, RAM upgrade: 12 x 2GB 1Rx8 UDIMMs won't POST

I'm upgrading a Dell R710 from single CPU to dual CPU with Xeon E5630 processors harvested from multiple R710 systems and combining into one. I have 18 2GB UDIMMs to play with, all from Dell ...
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0answers
106 views

bash: fork: Cannot allocate memory Apache

I have a server that is not a virtual machine, and has plenty of RAM (32GB) and its using less than 6, but I constantly get this error when running some programs. root@DAL1-727]# free -m bash: fork: ...
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44 views

Acquire XEN guest memory image over network

I am trying to dump a memory image from a XEN guest (Ubuntu 12.04 x64 - domU) in order to analyze it on dom0 (Ubuntu server 12.04 x64) with volatility and find some information about the guest virtual ...
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0answers
60 views

The difference in performance of different memory mount in dell poweredge R430

There are 3 servers R430 (S1, S2, S3). All of them have 2 procesors and 8*8GB of ram in slots A1-A4 and B1-B4. There is a need of extending memory. I've read dell recomendations (http://www.dell.com/...
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1answer
51 views

Is it bad to use swap with SSD when running a server out of memory?

I have DigitalOcean VPS, which has 2GB of memory. I'm soon running or am about to run out of it. How big is the performance hit if I use big swap? DO use SSD has harddrives, and I'm not the one who ...
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1answer
117 views

How to allocate more resources to Node.JS process?

I'm not a (very good) back-end developer so understanding processes and memory are a little about my pay grade. I'm currently building an app using the MEAN stack. I have a separate Express server ...
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1answer
121 views

Redis memory usage impact on performance

While performing health checks of a Redis 2.8.19 setup running on an 30GB Ubuntu Server 14.04 LTS, I noticed that Linux memory usage was split as follows: Used memory : 10GB Cached Memory : 10GB ...
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2answers
237 views

How to find out if slot or memory bar is broken

Today my Dell T7400 suddenly started to beep at startup. I figured out is likely to be a memory issue. I have used all eight (RAM ) slots (8x2GB). By removing / adding bar by bar I was able to ...
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1answer
175 views

RamMap shows millions of processes that Task manager doesn't

I have a server 2008 box with 32GB RAM on and i have been investigating why it runs out of memory every 150 ish days. Task manager shows that we are running at 99% memory usage but all the processes ...
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1answer
100 views

Is there a way to make /tmp mounted as tmpfs to use only swap? [closed]

I have a swap of 64 GB SSD. So is there a way to make /tmp mounted as tmpfs to use swap alone and not use RAM?
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1answer
918 views

Create a block device in RAM

One of my day-to-day tasks is to create a bootable image of a USB pendrive with our software on it. The image must consist of two partitions, first one formatted with FAT32 and second with EXT3. On ...
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194 views

Strange memory usage behavior in JBoss machine with Linux

I´m having a strange memory trouble with a Linux box with two JBoss instances and one Tomcat instance. All was working fine until last 20/jul. After that, the memory available (total used - buffers - ...
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462 views

Can't change memory_limit on PHP 5.5.9 on Ubuntu 14.04

I'm running PHP on Nginx using fpm. The reported memory_limit is 128M and i cannot change it for the life of me. PHPInfo: Server API: FPM/FastCGI Config file: /etc/php5/fpm/php.ini Memory ...
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2answers
411 views

w3wp/asp.net High memory usage - Is this problematic?

We have a asp.net (.net 4.0) webapplication that is installed in several environments. In most environments, the memory usage is somewhere around 1GB. However, we have one environment where the memory ...
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52 views

How to monitor MongoDB cursors

I have a MongoDB cluster with 1 PRIMARY and 2 SECONDARY servers. In the last couple of days the number of open cursors has risen from 10-20 a sec to more than 2K and keep rising. I'm getting a lot of ...
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228 views

What does it mean when memtester reports errors only in the arithmetic tests?

I know I have memory errors on this server so I took it offline (it doesn't have ECC RAM unfortunately ...). I also don't have physical access so I'm using the inferior memtester (versus something ...
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2answers
544 views

Can one root server handle over 50M requests per month? [duplicate]

I am running a LAMP Application installed on one server, happily serving about 1M PI per month. Now I am looking into a potential partnership where my app might serve around 50-80M requests per month. ...
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47 views

OOM Killer not triggering?

I'm working in an environment which has just been upgraded to Amazon Linux 2015.03 from Debian 6, quite a big jump. On the new platform a server instance has locked up a few times due to running out ...
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2answers
138 views

KVM host won't use memory for caching

I have a KVM host (Linux 3.14.32) running 8 virtual machines. They are overprovisioned (memory allocated for them is greater than available physical memory on the host). However they consume only ...
3
votes
1answer
44 views

slurm AllocMem always 0

When running jobs with --mem or --mem-per-cpu the AllocMem stays 0 when the job is running. # scontrol -V slurm 2.6.5 # sbatch --mem=2500 tmp.sh Submitted batch job 25 # squeue JOBID ...
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72 views

Windows equivalent of Linux vmstat pswpin and pgfault?

Is there a way to query Windows for the total number of pages swaped in / out and total amount of page faults? (values found in /proc/vmstat on Linux) I could only find ...
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2answers
813 views

Troubleshooting a Redis Stall

We have several redis instances running on a server. There are also multiple web tier servers connecting to those instance that experience a stall at the same time. We had packet captures going at ...
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1answer
209 views

G-Wan uses all available memory

I've installed the latest at the moment g-wan web server (4.3.14 x64) on a KVM VPS with Ubuntu 14.04.02 x64 server edition provided by Vultr ( 1GB RAM, 1 CPU core and 2GB swap ). The VPS setup is ...
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1answer
345 views

I shouldn't use both RDIMMs and LR-DIMMs on the same motherboard, right?

I tried to use on the same motherboard at the same time: Three LR-DIMM memory sticks, Four RDIMM memory sticks. The server refused to start; when I use either three LR-DIMM sticks or four RDIMM ...
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23 views

SSD vs RAM - Optimal ratio for different data sets / databases [duplicate]

I am looking for an advice or even better some studies / benchmarks to read for different scenarios (data sets) when it comes to the best ratio between actual RAM and SSDs. I know that fitting the ...
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296 views

vSphere | VMs are balooning and swapping | sched.mem.max paratmetar does not exist

I have two VMs in ESXi5.5 environment that are swapping memory. After a long research I found out the below two articles where it is explained that one must compare the values of memsize and sched.mem....
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1answer
49 views

C891FW-E-K9 Memory upgrade

I have a C891FW-E-K9 ISR with ios c800-universalk9-mz.SPA.154-3.M-2. From what I can gather, the memory requirements for that image is 512MB but from "show version" my router seems to only have 384MB ...
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199 views

Java out of memory exception when running as a non root user

I'm attempting to run apache kafka on a small basically stock digital ocean server running centos 6.6. I'm not positive if this issue is kafka specific or not. When I run kafka as the root user ...
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82 views

How many SSDs are needed to assure redundancy? [closed]

If we consider, hypothetically, that a server farm is being designed to have 100TB of storage using solid state drives (SSD), each with 250GB each. My question is how many SSD are needed to ensure ...
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1answer
40 views

Expand linux memory to disk [closed]

I know you can create RAM Disks but is there a way to turn disk space from say a USB drive to RAM? I have a small router based device with SSH and I would like to install a side app on it. The ...