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

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Sar: Free memory statistics (including buffers, cache)

The free commands gives the amount of free memory in two forms: completely free memory (the Mem line) and disposable memory used for caches and buffers (the -/+ buffers/cache line): -bash-3.2$ free ...
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Virtual Server Memory not a power/multiple of 2

In the old times (before virtualization), memory came in powers/multiples of 2, because that is the way memory is manufactured. Nowadays that we create virtual servers that don't have real physical ...
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Can my mysql server be fully tweaked? [closed]

I'm on a quadcore CENTOS 5.9 i686 standard running WHM 11.36.0. It's a dedicated LAMP server with lots of websites, most of which are using databases. I'm monitoring the server using Munin and notice ...
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Postgres using only 500 MB of RAM of the available 4 GB

We recently moved to running postgres server on it's own VM and tracked the memory usage of the VM. Here is what I found: That the postgres is only using 500 MB of the available memory on the VM. ...
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will a 100GB database with large tables on MSSQL 2008 server run on a 3GB RAM system? [duplicate]

This will be only for testing and developing. I have a 100 GB DB I am working on and need a sanbox envorinment. The only hardware I have is a desktop with 3GB and 32bit. I am able to install SQL 2008 ...
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Solaris memory allocation

I have solaris system that installed 12 GB RAM. All running process consume about %65 memory. I start to application that tshark (wireshark command line alternative). Tshark complete parse a ...
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Slow Memcached: Average 10ms memcached `get`

We're using Newrelic to measure our Python/Django application performance. Newrelic is reporting that across our system "Memcached" is taking an average of 12ms to respond to commands. Drilling down ...
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Proliant server ML 370 G4 RAM upgraade

can we use ECC non-registered RAM 667MHz on HP Proliant ML 370 G4?
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Choosing linux server for mysql - memory clock speed [duplicate]

I have a Linux Mysql server cluster where master and slaves are overloaded by a combination of read/write i/o and by SELECT queries load. We purchased FusionIO cards to replace the hard drives. My ...
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68 views

Xen domU sees 35MB less than assigned

I am using ubuntu precise 12.04 and I am booting a paravirtualized ubuntu 12.04 domU, all being 64 bits. The VM has memory=1024 assigned and xentop at the host correctly shows 1024MB, but htop in the ...
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CentOS 6: strange page allocation failure messages [duplicate]

I set up a new Server with CentOS 6.4 final as successor for an old mysql server and I'm facing some problems with it. From time to time mysql connections are being disconnected. Furthermore the ...
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827 views

1GB VPS - Apache Worker MPM - FCGID - Max concurrent connections - RAM CAP

I have spent a week or two researching and setting up my server to run Apache with the Worker MPM and FCID. I am trying to optimize it to allow for the most concurrent connections possible. It has ...
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763 views

Very high RAM buffers usage following instance resize/reboot

Yesterday afternoon, we resized one of our Linode instances (CentOS 5.7, 64-bit) from a 4GB instance to 12GB. Immediately following that reboot, I noticed that memory usage for buffers was insanely ...
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502 views

Increase kmemsize size of non-swappable kernel memory

I'm getting an error about not enough resources on a VPS running CentOS The exact error has to do with non-swappable memory. Here are the stats Current Use 29.35 Soft Limit 30 Hard Limit 33 Units MB ...
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56 views

how to map virtual memory to physical memory [closed]

Is there a way to map virtual memory to physical memory. I need to be able to do this in order to write a memory diagnostic program. The linux version is 2.6.36.4
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Oracle 10g on RHEL - All memory gets eaten up nightly at 20.15

Okay, to start things off, I'm brand new to Oracle DB. Much experience with Microsoft products (boo) and Ubuntu linux, but RHEL and Oracle are very new to me. The environment ... Oracle DB 10g ...
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About huge page and translation Lookaside Buffer

they confuse me. huge page: the way to manage physical memory of OS kernel, it is split huge page by kernel for reduce the index number in page table. I get it from : ...
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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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Do we have a memory leaking application?

I am not sure how to interpret the memory usage of our servers on which WebSphere MQ (WMQ) is running. The main question is: Is WMQ using more and more memory over time (is it leaking memory) or is ...
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855 views

Linux Kernel (/proc/meminfo) Not Reporting All Memory

I have two machines that are identical in every way (hardware, distribution, application workload, /proc/sys/vm settings, etc), except for the the kernel version. One is 2.6.33 and the other is 3.1.0. ...
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Changing memory allocator to Jemalloc Centos 6

After reading this blog post about the impact of memory allocators like jemalloc on highly threaded applications, I wanted to test things on a larger scale on some of our cluster of servers. We run ...
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Cent OS: How do I turn off or reduce memory overcommitment, and is it safe to do it?

From time to time "my" server stalls because it runs out of both memory and swap space. (it keeps responding to ping but nothing more than that, not even ssh). I'm told linux does memory ...
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Get full physical Ram memory with bash

I know some of you might find my question stupid but i need to know how much ram is installed on a centos box Yes i know it can easily be done by using the command awk '/MemTotal/{print $2}' ...
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htdocs in RAM disk?

I was wondering the other day why wouldn't one place all the htdocs related files in a RAM disk. It seems to me, that this would greatly improve the time it takes for the disk to lookup and read ...
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PowerEdge 2800 RAM Upgrade FAIL

I have been trying to upgrade the RAM on my Dell PowerEdge 2800 unsuccessfully, likely because I do not know enough about RAM. The RAM I got a hold of is labeled 2GB 2RX4 PC2-5300P-555-12-xx. When ...
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How to find out who used all RAM (UPDATED)?

Sometimes I find that 100% of my small Debian machine's RAM is used, but I can't figure out how to find this leak: top show that all memory is used, but I can't find any process that consumed this ...
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Lots of unused memory on EL6 compared to EL5

On our el6 servers there is a quantity of unused memory while on el5 servers there was no such problem. We need to get more aggressive caching on el6 as it used to be in el5. Munin graphs on el6: ...
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What is using the memory when e2fsck is running? [duplicate]

I am having trouble running e2fsck due to memory limitations, as detailed in this question. In the course of investigating that, I came upon something that may be of more general interest, so I will ...
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421 views

e2fsck on a low-memory machine: can I get more out of scratch_files or swap?

I am running CentOS 6 on a 32-bit machine with 1 GB of RAM. I have a 1TB external HDD that I am trying to run e2fsck on. It runs for about an hour and a half and then fails with Error storing ...
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67 views

How to Compare better Memory utilization between two machines [closed]

i am having two kvm hosts with same h/w and os,only difference is one host is tuned to use huge pages. How can i compare which is performing better I am planning to use some application that is more ...
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My Mac Pro (tower) running Windows 7 Ultimate says 1.99GB RAM usable? [closed]

I own a Mac Pro (Tower) with 32GB RAM that I bought about four months ago. I installed Windows 7 Ultimate and it says only 1.99GB of RAM out of 32GB's is usable? ...
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Server with high consumption of physical memory; swap is not being used [duplicate]

Please, I need a help. I have a Linux that has the following scenario of RAM memory consumption: root@cpro15623 [~]# free -m total used free shared buffers cached ...
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pages_sharing and pages_shared difference in ksm

Can some one please help me understand this. i am running kvm hosts with 5 vms on it. These are ksm driver statistics each page is 4KB cat /sys/kernel/mm/ksm/pages_shared 162221 cat ...
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server busy threshold? [closed]

i have a server with 512MB RAM running mysql and apache service. I have joomla site inside my server. I want to ask, is there a brief threshold limit of RAM when the server will be stated as busy? ...
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How much space is in a Solaris /tmp filesystem?

On Solaris, the /tmp filesystem is a filesystem of type "tmpfs". It's implemented in the kernel by allocated space from the virtual memory pool. That means allocation interacts with the available RAM ...
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T410 Memory upgrade Mixing Size&Clock

We have a Dell T410 server using : A4/B4 - A1/A1 - 2GB/2GB 1066mhz A2/A2 - 2GB/2GB 1066mhz A3/A3 - I have 2x4GB 1333mkz for upgrade to 16GB. But : A4/B4 - A1/A1 - 2GB/2GB 1066mhz A2/A2 - ...
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how to know if the server runs out of RAM before crashing down

I have a server that keeps on crashing. I know there are several causes for a server to crashes down. But if the cause is that the system is running out of RAM before it crash down; how should I ...
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Finding the file/script that invoked a process

I do have a high CPU utilization PhP Process. This process in turn seem to invoke mysql and both processes together are using all the CPU cores and RAM using ps aux | grep php , i could get the ...
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How to retrieve memory type (rdimm or udimm)?

i've some DELL servers, some have registered dimm memory, others have unbuffered dimm. Do you know any way to programaticaly get this info ? wmi class win32_physicalmemory doesnt seem to help on this ...
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Memory pegged by unknown process [duplicate]

I have some strange output from the top command on my web server. Output is ordered by %MEM: top - 13:57:43 up 13 days, 21:58, 1 user, load average: 0.00, 0.00, 0.00 Tasks: 118 total, 1 running, ...
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Has L2 cache stopped getting faster? [closed]

I was reading this question which references L2 cache hits as taking about 10ns: Are networks now faster than disks? However I distinctly remember there being 10ns cache ICs for the 486 generation. A ...
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186 views

/proc/XXX/smaps does not exist

I am trying to debug what is going on on an ubuntu server. I tried to use my good old friend smem but it does not display anything, even if run as root. strace shows the culprit: ...
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318 views

Monitoring memory of AIX 5.3 LPARs

I'm currently administrating an IBM Power 740 server via an HMC. We have four LPARs running, two VIOS LPARs, one application LPAR and one database LPAR. We have implemented lpar2rrd to monitor CPU ...
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3k views

MariaDB / MySQL using a lot of threads / memory

I've been setting up a new VPS and wanted to try out MariaDB. I'm using MariaDB 10.0.1, which as far as I understand it is the equivalent of MySQL 5.6. Has the thread handling of threads changed ...
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716 views

How Can I Maximize Apache Performance on my Server - Need Calculations Please [closed]

I have a Sun T5140 server with 8GB of memory and two 4-core T-Series CPU's (128 max threads). This server is a dedicated web server. Based on the premise that I'm willing to allocate 1/2 of the ...
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Will uploading a 1.4gb video to my server and letting users watch it fill my servers RAM/Virtual Memory and crash the server? [closed]

I'm a bit unclear how the the RAM is used in this particular instance, so I'm wondering if when a user watches a video on my server, does it go from the filesystem, "out through the pipes" and onto my ...
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MS SQL Express - Memory limitation vs. web application [duplicate]

I have web application that will be similar to forums. I plan to have few thousands+ users on this application, and i wonder if i can use MS SQL Express - here is the list of it's limitations: ...
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508 views

How to know which application is consuming the ram?

I have the following process list and memory consumption (reported thru process explorer) on a 2008 R2 server with SQL, TFS and some other tools: As you can see the system is consuming 3.6 Gb but ...
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169 views

sizing memory for virtual ETL server - is paging recommended?

I am working on the sizing for a virtual server to be used for Business Intelligence ETL processing. We have an existing server from which I can observe the expected trend on the planned one - almost ...
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X7DWN+ 14GB Memory Fitted - 10GB Detected by BIOS

We have a Supermicro X7DWN+ motherboard with two Xeon L5420 CPU's installed. There is a total of 14GB memory installed, however the BIOS is only seeing 10GB. The memory has been tested in another ...