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

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31
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5answers
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How to understand the memory usage and load average in linux server

I am using a linux server which has 128GB of memory and 24 cores. I use top to see how much it is used. Its output is pasted at the end of the post. Here are two questions: (1) I see that each of the ...
47
votes
3answers
38k views

Meaning of the buffers/cache line in the output of free

Why does my server show total used free shared buffers cached Mem: 12286456 11715372 571084 0 81912 6545228 -/+ buffers/cache: 5088232 7198224 ...
14
votes
1answer
9k views

How to interpret output from Linux 'top' command?

Following a discussion made HERE about how PHP-FPM consuming memory, I just found a problem in reading the memory in top command. Here is a screenshot of my top just after restarting PHP-FPM. ...
6
votes
2answers
1k views

SQL Server memory constantly going up, from 1GB RAM used to 7GB in a week

I have a ~45GB database that increases rapidly (~1GB every week). So it's doing a lot of inserts; the web app doesn't have many users so reads are low right now. But I'm noticing that the RAM sql ...
165
votes
14answers
61k views

Any benefit or detriment from removing a pagefile on an 8GB RAM machine?

I'm running Windows 7 on a dual core, x64 AMD with 8GB RAM. Do I even need a pagefile? Will removing it help or hurt performance? Would it make a difference if this is a server or a desktop? Does ...
34
votes
3answers
18k views

In Linux, what is the difference between “buffers” and “cache” reported by the free command?

This is an old question that I've seen from time to time. My understanding of it is rather limited (having read about the differences a long time ago, but the factoid(s) involved never really stuck). ...
19
votes
4answers
16k views

What is ECC ram and why is it better?

I've seen a dicussion about ECC ram use on servers. Why is it better?
7
votes
10answers
5k views

How big should the swap partition be?

for some years, I've read that it's a good idea to create a swap partition having the double space of my RAM. does it still apply today? or this isn't needed anymore? I have a server with 8 GiB of ...
7
votes
2answers
8k views

Running out of memory running fsck on large filesystems

I look after an old Debian linux box (running etch) with only 512 MB of RAM, but a lot of external storage attached. One ext3 filesystem is 2.7 TB in size, and fsck can't check it, because it runs ...
13
votes
1answer
4k views

deleting linux cached ram

I have a webserver that has 8GB of ram and is running a pretty intensive php site (1 site) that does file manipulation, graphing, emailing, forums, you name it. The environment is far from static ...
4
votes
6answers
1k views

linux eats all memory, seems like it is not for specific application [duplicate]

The system is not overloaded and there is no huge process that eats memory (RAM) but still it has only 20-40 MB free. Who is taking RAM and should I avoid it? (how?)
5
votes
4answers
523 views

Memory Usage in LINUX

I have a debian system. It has 8GB memory. When I do top it shows 7.9 GB memory used and rest free. I add up the memory usage of all the programs running from top and they hardly sum up to around 50 ...
25
votes
9answers
24k views

How to reduce memory usage on a Unix webserver

I'm currently using a Joyent Accelerator to host my webapps, and it's working fine, however I need to reduce costs so I'm downgrading my current plan and that imposes some new memory limits (256M rss, ...
16
votes
4answers
10k views

How can I determine the cause of an apparent memory leak in my Apache/PHP based web app?

About once a week, but sometimes even a couple of times a day after running fine for days, my EC2 instances become unresponsive. Munin's memory graphs tell a pretty straightforward story: memory ...
22
votes
3answers
15k views

Turn off the Linux OOM killer by default?

The OOM killer on Linux wreaks havoc with various applications every so often, and it appears that not much is really done on the kernel development side to improve this. Would it not be better, as a ...
13
votes
13answers
8k views

Simple tool to graph memory usage?

Is there a script that will show memory usage as a graph, for example as a pie-chart, with each process being being a separate slice? I'm not looking for something like Munin to graph memory usage ...
8
votes
5answers
12k views

32-bit Windows Server address > 4GB RAM - How?

This is news to me. I was always under the impression that 32-bit OS could only address 2^32 i.e. 4GB of RAM. Period. But what's this - ...
5
votes
3answers
8k views

Windows Server 2008 x64, Large File Transfers, and Memory Usage

I'm following up on this: http://serverfault.com/questions/37605/copying-large-file-to-remote-server-causes-it-to-run-out-of-physical-memory But figured I'd post this separately. I have a 64-bit ...
3
votes
1answer
9k views

SBS 2011 - Is Store.exe High Memory Usage Normal?

We have a SBS 2011 server with 16GB memory that runs Exchange, WSUS and File Sharing for approx 20 users. The server also gives 2GB memory to a virtual machine running in Hyper-V so 14GB left for the ...
4
votes
2answers
25k views

What is the difference between RDIMM vs UDIMM

I don't quite understand the differences between the two besides the obvious price differences. What does each offer over the other?
4
votes
1answer
20k views

HP DL160 G6 memory PC3-10600R vs PC3-10600E

I am using a HP DL 160 G6 server that according to specs takes PC3 Registered or Unbuffered. When I combine the two types of memory below the system will not POST. When I use just the first type of ...
13
votes
6answers
26k views

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 ...
14
votes
4answers
46k views

DIMMs: Single vs. Double vs. Quad Rank

What difference does the 'Rank' of DIMMs make to server memory? For example, when looking at server configurations I see the following being offered for the same server: 2GB (1x2GB) Single Rank ...
10
votes
2answers
3k views

How is memory usage reported in Linux?

Using ps, I can see the size, the vsize (same as top's VIRT?), and the rss (same as top's RES?). (One more I see in top is SHR.) Could someone summarize for me what these different fields mean?
10
votes
6answers
30k views

Weird memory usage in Windows Server 2008 R2

I hope someone can help. We've got a Windows Server 2008 R2 machine with 16GB of RAM that keeps getting all its available memory eaten by something. Nothing in Task Manager or Resource Monitor reveals ...
19
votes
7answers
10k views

Windows Server 2008 R2 Metafile RAM Usage

I have a server which runs Windows Server 2008 R2 x64 with 4GB of RAM which hosts around 2-3 million files, the majority of which are image files. Over a course of a week, I have noticed that ...
1
vote
3answers
2k views

How to find out if my Windows Server 2003 needs more memory?

What's the best way to find out if my server needs more memory? I suppose I should use Perfmon, but which counters? Thanks.
20
votes
4answers
2k views

Can MySQL effectively take advantage of 64 GB RAM?

We have been running into a problem where querying a table that has approximately 50 million rows, and has an index size of 4 GB (table size of about 6 GB) results in the database server swapping ...
13
votes
3answers
16k views

page allocation failure - am I running out of memory?

Lately I've noticing entries like this one in the kern.log of one of my servers: Feb 16 00:24:05 aramis kernel: swapper: page allocation failure. order:0, mode:0x20 This is what I'd like to know: ...
2
votes
1answer
194 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. ...
6
votes
3answers
2k views

e2fsck on large filesystem fails with Error : Memory Allocation Failed

I'm trying to use e2fsck on a large raid array that is 2TB large and uses GPT for partitioning (because of size). There is only 1GB of ram installed on the system and I do not have the ability to add ...
5
votes
5answers
2k views

Free / Cached / Available memory on Linux

I have read that linux uses free memory for caching, to make system faster. However, both Nagios and Paessler PRTG monitoring system show me that my memory usage is critical. I could change Nagios ...
2
votes
2answers
347 views

MySQL not using specified RAM anymore

A few days ago I got a new machine setup running CentOS 5.6 (64bit), with 12GB ddr3 ram, 4x SAS 15k rpm drives in RAID10. On this machine I'm running MySQL Server version: ...
1
vote
4answers
515 views

Should Swap be used like this?

I have a server with Dual Nehalem Quad Core Xeon 5520 and 12GB DDR3 RAM. The server's average memory usage is only around 10-15%, yet the Swap used shows 10%+. Is this normal, or could something be ...
5
votes
4answers
921 views

Why is my server using so much memory?

I haven't even set up my website on my dedicated server so I'm the only one using it at the moment. And yet this is what I see in my sys info: Full Size I just got a bunch of security softwares ...
4
votes
3answers
1k views

Do I need SWAP on my server?

I have a particular server : 50GB SSD for the OS (CentOS) , 128GB of RAM and 320GB SSD for MySQL. I'm wondering if I really need SWAP? I often read that 2GB is good even with lots of RAM. This ...
3
votes
1answer
815 views

Total RAM % from perfmon Windows Server 2008 R2

I am trying to find a good way to get available RAM percentage from perfmon. I can get Available Mbytes but I can't find any way to get the total installed memory on the server or what is in use via ...
3
votes
2answers
715 views

Unexplained cache RAM drops on Linux machine

I run a CentOS 5.7 64 machine with 24gb ram and running kernel 2.6.18-274.12.1.el5. This machine runs only Nginx, php-fpm and Xcache as extra applications. Since about 3 weeks my memory behavior on ...
3
votes
7answers
5k views

Copying large file to remote server causes it to run out of physical memory

I have a strange issue that appears to have started recently. When I copy a large file (Approx 6GB) from my laptop to one of our older fileservers the server runs out of memory after a few seconds. ...
1
vote
0answers
152 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 ...
0
votes
3answers
98 views

Please help me select a webserver configuration

I have a website, which has grown from 10 visits per day, to 100 per day in couple of months, and now to about 800 unique visits per day. So far, I have been using a VPS with 512MB RAM, and shared ...
0
votes
2answers
261 views

free memory in Linux [duplicate]

Possible Duplicate: Meaning of the buffers/cache line in the output of free I did free -tm on my system, and I got the output below. Is the free buffers/cache part of the used memory? And ...
0
votes
5answers
173 views

Centos /dev/sda1 partition memory issue

We have a problem with /dev/sda1 partition memory issue. It takes about one week to be filled in 99% without reason. To fix it we just need to reboot server and memory usage back to about 35%. Total ...
34
votes
2answers
1k views

vSphere education - What are the downsides of configuring VMs with *too* much RAM?

VMware memory management seems to be a tricky balancing act. With cluster RAM, Resource Pools, VMware's management techniques (TPS, ballooning, host swapping), in-guest RAM utilization, swapping, ...
8
votes
5answers
21k 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?
8
votes
2answers
9k views

Best Mysql cache settings for 8gb RAM dedicated mysql server using only Innodb (5gb database)

I'm a pretty big noob when it comes to setting up mysql for performance. And honestly I'm not worried about the fine tuning to squeeze every last bit of performance out of mysql, but I do know that ...
11
votes
5answers
1k views

Linux with 256GB of mem / 48 Cores - Machine starts thrashing/choking with tons of memory left

Machine: Dell r815, CentOS 5.4, 256GB of RAM, 4 x 12 Cores. We have an application that has a 275GB file. It does an in place sort on 20GB of data at a time i.e. it swaps bits around and replaces ...
8
votes
11answers
9k views

Linux server is only using 60% of memory, then swapping

I've got a Linux server that's running our bacula backup system. The machine is grinding like mad because it's going heavy in to swap. The problem is, it's only using 60% of its physical memory! ...
6
votes
4answers
23k views

ECC chipkill errors: which DIMM?

We often get DIMMs in our servers going bad with the following errors in syslog: May 7 09:15:31 nolcgi303 kernel: EDAC k8 MC0: general bus error: participating processor(local node response), ...
12
votes
3answers
2k views

Can you determine which Apache modules have been used and can be removed?

I, like many people, have a relatively out-of-the-box Apache installation with a lot of default "LoadModule" lines. Since the beginning, I've installed a lot of software, and to be honest, I don't ...