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26
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3answers
2k views

Why is Linux reporting “free” memory strangely?

This is a canonical question about how Unix operating systems report memory usage. Similar Questions: Server refuses to use swap partition Memory Usage in LINUX I have production ...
55
votes
3answers
49k 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 ...
1
vote
3answers
1k views

High Memory Usage on Linux Server

I have a LAMP server with following configuration. CPU : Intel(R) Xeon(R) CPU RAM : 32 GB HDD : 80 GB Running on virtual environment. All the things in the server are running smoothly. But I ...
12
votes
11answers
14k views

A monitoring tool that captures processes' memory usage/cpu usage, etc over time

I am looking for a way to diagnose issues, such as swap death, where a balooning memory process fills up swap and kills the whole machine (such as apache). I'm already using cacti and I can set up ...
13
votes
6answers
35k 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 ...
6
votes
5answers
3k 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 ...
3
votes
2answers
799 views

SQL 2008 Memory Usage

I have a SQL Server 2008 (ver 10.0.1600) running on a Windows Server 2008 R2 Enterprise server with 8 GB of physical ram. If I open Task Manager I can see on 'Physical Memory' section of 'Performance' ...
2
votes
2answers
1k views

ec2 memory usage

I set up a site on amazon ec2 free tier, which comes with 613MB memory with no swap. I see server uses almost 100% of memory all the time. My site is running wordpress with wp super disk cache turned ...
2
votes
4answers
2k views

Linux high memory usage (top total mismatch)

I havea poor mans vps - 256MB dedicated RAM. I have installed LAMP. No website is currently UP on the server yet. The memory usage is still 225MB (only 31 MB free). I have measured using top and ...
1
vote
3answers
321 views

Server Load Check

Is it possible to trace which file or process or database query is effecting the load on a VPS? I am using Centos with 512 MB Guarantee Memory and 1 GB burst Memory, I am running 3 wordpress sites ...
8
votes
2answers
3k views

Is it possible to list the files that are cached?

Here the output of free -m: total used free shared buffers cached Mem: 7188 6894 294 0 249 5945 -/+ buffers/cache: ...
7
votes
1answer
5k views

Apache memory usage optimization

Apache is using too much of my server memory causing it to crash. I have 4GB of RAM in the server. I'm trying to fine tune Apache settings in order to improve it's performance but I'm quite new at ...
6
votes
1answer
4k views

Linux not freeing large disk cache when memory demand goes up

Running Ubuntu on a 2.6.31-302 x86-64 kernel. The overall problem is that I have memory in the 'cached' category that keeps on going up and will not be freed or used even when our application needs ...
10
votes
1answer
2k views

How large is my ZFS dedupe table at the moment?

I have read a lot of information about planning RAM requirements forZFS deduplication. I've just upgraded my file server's RAM to support some very limited dedupe on ZFS zvols which I cannot use ...
4
votes
2answers
8k views

Apache heavy load VIRT vs RES memory

I have a Debian 5 server, which gets a lot of traffic. Right now the server has 4 GB of RAM and no swap memory. I see in top that Apache processes consume roughly 180 MB virtual memory (VIRT) each, ...
2
votes
3answers
2k views

Finding Average size of single Apache process for setting MaxClients

i tried pmap pgrep apache2 |grep total on ubuntu 10.4 running Apache and the o/p was like this: total 47768K total 48048K total 48048K total 48048K total 48048K total 48048K ...
1
vote
3answers
5k views

What is the maximum memory a process (MySQL) can consume on a 32-bit OS?

I have MySQL running on a 32-bit RHEL box. The server itself has 4GB total memory with 2GB allocated to MySQL. I would like to know the max amount of memory I can put in the box and how much of that ...
0
votes
3answers
2k views

Linux Top shows 99% Memory in Use - Is it normal? [duplicate]

Possible Duplicate: Linux high memory usage (top total mismatch) High Memory Usage on Linux Server CentOS 5.7 dedicated server. No memory intensive processes running. 12GB RAM installed. ...
0
votes
1answer
717 views

memory difference on top and htop

I got a new VPS as my database server. I installed only mysql and started. After some time(even after shutting down mysql service), I see only %3-4 of the memory used in htop but according to top I ...
5
votes
5answers
12k views

How can I monitor memory usage for a windows-based JVM and trigger an alert if it gets too high?

I have an app that runs as a JVM in Windows 2008. I'd like to monitor it's memory usage and be sent an email if/when memory usage reaches a specific threshold. Is there a free utility or method for ...
3
votes
3answers
6k views

What's using all my memory?

SOLUTION: There's a lot of stuff to read in this thread, so i'll just summarize here to help. The problem is the VMWare ESX balloon driver which "inflates" the amount of memory "in use" that ...
2
votes
1answer
2k views

How to free PHP-FPM memory?

There are several discussions complaining high memory usage of PHP-FPM, without any practical approach to overcome. As I explored the problem with numerous tests, the problem is related to the age of ...
2
votes
4answers
122 views

Is this a good behaviour? [duplicate]

My centos 5.7 is running Magento. 4GB RAM and 4 Cores. Nginx + spwan-fcgi + memcached (Best performance if you ask me). Now i'm a little bit concerned about the Memory usage. [root@adikastyle ...
1
vote
4answers
1k views

How to reduce the memory usage of mediawiki?

I have a VPS running apache that keeps running out of memory at Dreamhost. Dreamhost says that the problem is the wordpress configuration, but I think that's their stock answer. I've looked and the ...
1
vote
4answers
912 views

Fresh Debian Squeeze (6) Installation - Very High Ram Usage

We've got a new server provisioned, and are experiencing high ram usage, without information on the usage in either htop / top nor in a python memory script found ...
1
vote
2answers
1k views

Viewing SQL's cache RAM usage?

I hope this has a really simple solution, but I have a feeling it won't. I've not been able to find any information on this anywhere else, which isn't a good start! Basically we're running SQL Server ...