1
vote
0answers
32 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, ...
0
votes
2answers
49 views

PHP exec “unable to fork” intermittent error on CentOS VPS

Using: PHP 5.5.10 nginx 1.5.10 Centos 6.5 a xen-based 4GB VPS My site uses encrypted paypal buttons. This encryption is done by the following code: $openssl_cmd = "($OPENSSL smime -sign -signer ...
0
votes
2answers
46 views

Centos 6 webserver - best use of spare memory [closed]

Just after any quick easy suggestions about where I should try tweaking my web server to use some of the spare memory and reduce CPU usage. Sorry if I'm a bit vague, but this isn't really my area. I ...
0
votes
1answer
31 views

Total memory consumption in linux machine

i have a question of mem RAM cosumition. The question is that "htop" show me 6GB or RAM used of 32Gb but i can´t find which process are consuming this amount of memory. if i run ps -e -orss=,args= ...
0
votes
1answer
91 views

Worker MPM or Prefork? [closed]

I understand that there is a comparison topic between the two modules here but this is different. I was contacting cPanel support in order to help me freeing up some memory usage on the VPS. They ...
0
votes
1answer
152 views

Linux empty buffer cache command permission denied

I'm using the following commands to flush cache: # sync; echo 3 > /proc/sys/vm/drop_caches # sync; echo 2 > /proc/sys/vm/drop_caches # sync; echo 1 > /proc/sys/vm/drop_caches When I use ...
1
vote
0answers
39 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?
11
votes
4answers
475 views

Unusually high dentry cache usage

Problem A CentOS machine with kernel 2.6.32 and 128 GB physical RAM ran into trouble a few days ago. The responsible system administrator tells me that the PHP-FPM application was not responding to ...
2
votes
1answer
113 views

Our RAM usage is high, including -/+ buffer/cache, but top has no answers

We are running CentOS 6 with a PHP web application. After we pushed a new version live it seems we have a memory issue, however top does not show any high usage instances. I have looked around and ...
3
votes
3answers
172 views

High Memory 64bit server, not using all ram

I have several high memory linux servers running centos 64bit, and after 10-20 days of uptime I have noticed on all of these servers they dont actually use all the ram available to then (they all have ...
0
votes
1answer
74 views

Transfer used ram to swap and free more physical ram

I have a vps with 256m physical ram and 512m swap space, I am trying to use a software that need more than 256m and less than 512m ram, so it uses swap. The problem is at some moment of the ...
-1
votes
1answer
77 views

Top not accurately showing memory usage [duplicate]

Top is not showing my memory usage accurately or is my VPS provider doing something strange? As you see in the picture bellow it uses 90%+ of the memory, but when you look at what processes that is ...
0
votes
3answers
704 views

How To Reduce php-fpm RAM Usage in CentOS 6.4?

I've installed LEMP stack on my server. My server have 1GB of RAM with no load. I've installed php-fpm and it looks like it's using most of the RAM of my server. I've used the below command to get ...
0
votes
2answers
99 views

How to determine if you need to upgrade memory?

My CentOS server's munin graph shows high swap, but the amount of apps memory seems low. Does this still mean I need to upgrade my memory? What is causing all that swap? Is it because of the ...
2
votes
1answer
166 views

Centos 6.4 install only showing 160G of 192G installed ram, dmesg shows all 16x16G sticks

Any ideas why? Same sever with ubuntu 12.04 shows 192G properly. With centos 6.4 (64 bit): with Ubuntu 12.04 (64 bit): I put the mem=193447M in the kernel section of /boot/grub/grub.conf to no ...
2
votes
3answers
2k views

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 ...
4
votes
1answer
312 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 ...
0
votes
1answer
270 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 ...
6
votes
3answers
1k views

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 ...
-1
votes
1answer
295 views

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}' ...
1
vote
2answers
335 views

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: ...
1
vote
1answer
262 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 ...
1
vote
2answers
1k views

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 ...
1
vote
1answer
2k 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 ...
-1
votes
1answer
135 views

A brand new VPS with high system overhead for RAM. Should I worry? [duplicate]

Possible Duplicate: Why is Linux reporting “free” memory strangely? I recently bought a cloud VPS (CentOS 5.8 x64) with 1024MB RAM from one of the hosting providers. It's managed and has ...
0
votes
3answers
1k 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
2answers
857 views

how to drop_caches in OpenVZ centos6 container

I have tried sudo sh -c 'echo 3 > /proc/sys/vm/drop_caches' sudo echo 3 > /proc/sys/vm/drop_caches echo 3 > /proc/sys/vm/drop_caches echo 3 | sudo tee /proc/sys/vm/drop_caches and a ...
2
votes
1answer
510 views

Low-traffic WordPress website on Apache keeps crashing server [closed]

I have recently moved my low-moderate traffic (1000 UAUs, 5000 pageviews on a busy day) website from shared hosting to a Centos 6 64-bit VPS with Apache and cPanel running on 4 quad-core processor ...
2
votes
5answers
483 views

What should I do with all my free ram? [closed]

I have a weird kind of problem. I host a small webshop, it´s nothing big perhaps 20 visitors per day and a few orders per week. I will probably expand it a bit but I doubt it will grow very large. ...
0
votes
2answers
265 views

My VPS is Out of RAM how much to I need more? [closed]

I have VPS server with 1.25GB ram and 0.51GB cache trying to up an e-commerce website with 200k items, db now is about 2gb anything is now works terrible slow now because of lack memory mysql queries ...
1
vote
0answers
355 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 ...
0
votes
2answers
716 views

CentOS Out of memory kill. Apache is hogging something

I have a 1GB RAM Linode on a CentOS LAMP running Drupal Aegir with just 3 Open Atrium sites, and about 10-20 concurrent users. At random times, it pukes an Out of Memory kill. I can't figure out ...
5
votes
3answers
2k views

Clear / Flush cached memory

I have a small VPS with 6GB RAM hosting a couple of websites. Recently I have noticed that my cached memory size is quite high - see below: Cpu(s): 0.1%us, 0.1%sy, 0.0%ni, 99.1%id, 0.0%wa, ...
6
votes
3answers
1k views

Should I reinstall my production server from 32 bit to 64 bit if it has 16GB of RAM?

I have a production server with 16GB of RAM that came with a 32bit CentOs installation. The website hosted on this server is increasing its traffic every day and I am having some MySQL trouble so I ...
1
vote
0answers
154 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 ...
1
vote
3answers
166 views

Is it safe to use up all memory on linux server, not leaving anything for the cache?

I have a CentOS server fully dedicated to MySQL 5.5 (with innodb tables mostly). Server has 32 GB RAM, SSD disks, and avarage memory usage looks like this: So about 25GB is in use and about 6.5GB ...
2
votes
1answer
88 views

CentOS VM only using a third of available memory

I have a VM slice running CentOS, on Parallels. Here is the output of free -m [root@server ~]# free -m total used free shared buffers cached Mem: 960 ...
0
votes
0answers
125 views

Max memory including burst

I have CentOS 5.8 32bit with 1GB of guaranteed memory. With Burst memory I'm on 2GB. I'm thinking of upgrading my guaranteed RAM to 2GB making my Burst 4GB. I know a 32 bit system can't (normally) ...
1
vote
4answers
3k views

CentOS 6.3 X86_64 RAM detection

I have a machine with 8GB ram (BIOS sees it, so my motherboard and CPU supports it), and I installed CentOS 6.3 on it. When it starts up, it only see 3.1GB. uname says: 2.6.32-279.1.1.el6.x86_64 #1 ...
1
vote
1answer
1k views

Centos is using all memory for cache and not giving it up

total used free shared buffers cached Mem: 1024 1020 3 0 0 859 -/+ buffers/cache: 160 863 With 863 ...
0
votes
0answers
739 views

lamp centos 5.8 suddenly out of memory

This system is running Centos 5.8 final using 2.6.18-308.4.1.el5 as a virtual machine on VMware ESXi 5. Standard LAMP install, running three instances of Wordpress. Server has been running for a ...
7
votes
1answer
7k views

How should I tune apache when I see high CPU, but low memory usage?

My CentOS web nodes (LAMP stack) are experiencing high CPU usage but low memory usage. Nearly all of the processes are apache. I know I could just add additional web nodes until my cpu usage becomes ...
1
vote
2answers
2k views

server running out of memory

the server is running out of memory and get to the point where it starts killing the process, the total PSS memory(actual memory used from the Resident memory) consumed by top using applications is ...
0
votes
0answers
84 views

High memory even tho no traffic

I have 2 webservers running Apache 2.x on CentOS 5.x. One of them was started like 16 hours ago and has lots of free RAM (about 28GB out of 34GB). My second server however, is running for a few ...
0
votes
0answers
158 views

Disk or CPU/RAM failure ? I can't figure it out

i'm having big trouble accessing my production servers (runnung xen); i recently bought brand new Western Digital (WD5000AAKX 500Gb) drives to replace the old drives; re-installed the system as it ...
2
votes
2answers
304 views

named gets killed

Every once in a while, my server will kill named. This gets logged: Apr 16 17:00:08 li127-203 kernel: Out of memory: Kill process 15723 (named) score 38 or sacrifice child Apr 16 17:00:08 li127-203 ...
0
votes
3answers
2k views

Swap 95%+ , but a lot of free ram memory

I am running centos 5.8 with cpanel. Lately I am getting reports that my swap is full , but there is a lot of free memory to use. top - 10:33:43 up 133 days, 17:00, 1 user, load average: 0.05, ...
-5
votes
2answers
195 views

How do I configure Linux to use less memory for IO caching?

I'm running a Dell R310 with CentOS 5.8 x64 and all it's running is apache, svn, and postfix. It's using 99% of the RAM for caching but i'd like it to use a little less like maybe somewhere in the ...
1
vote
2answers
456 views

More than half of the memory in use right after rebooting

I am trying to do some tests with Azul's ZingVM, which needs to pre-allocate large amount of ram. The problem is, on my server (running Cent OS 5.8) which has 16GB ram, more than 8GB will be used ...
1
vote
1answer
1k views

Centos server not using SWAP properly and getting OOM

Recently I've been having some serious memory issues with my server. Just the other day, my server became completely unresponsive, and oom-killer started killing services at random (httpd, php, etc). ...