1
vote
1answer
130 views

CentOS only detecting 50% of ram on IBM Server

I have IBM server with 16 GB RAM installed. Initially it showed 16 GB with free | grep Mem | awk '{print $2}' but now it shows only 8116136 but it must show 16439208 When I do dmidecode ...
7
votes
1answer
523 views

How does vm.overcommit_memory work?

When I use the default settings: vm.overcommit_memory = 0 vm.overcommit_ratio = 50 I can read these values from /proc/meminfo file: CommitLimit: 2609604 kB Committed_AS: 1579976 kB But ...
5
votes
1answer
191 views

Linux Kernel lowmem usage

I am debugging an issue where we are running out of kernel low memory and I am trying to identify who is using the kernel low memory thats contributing to the problem. Following is the meminfo ...
0
votes
2answers
260 views

Moving a process to and from swap [closed]

I've got serveral processes (game servers) on my linux server that use up 50MB of RAM. They are not constantly being used, and I'd like to be able to run more instances than my RAM capacity allows. I ...
0
votes
2answers
997 views

What is using the RAM on this Ubuntu 12.04.2 server?

I have two servers in a pool with Nginx, PHP5-FPM and Memcached. For some reason, the first server in the pool seems to inexplicably lose about 2GB of RAM. I can't explain where it's going. A reboot ...
2
votes
3answers
5k 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 ...
0
votes
1answer
1k views

An oom killer that I cannot explain

I am not able to understand why would kernel issue this oom killer when I see enough memory is available: I say enough memory is available after looking at Normal DMA Normal free lines This is an ...
1
vote
2answers
3k 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 ...
2
votes
2answers
358 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
1answer
1k views

Is this a memory failure being logged (CentOS web server)

$ sudo tail /var/log/messages Jan 30 13:47:58 www kernel: EDAC MC0: CE row 3, channel 0, label "": Corrected error (Socket=0 channel=1 dimm=1) Jan 30 13:47:58 www kernel: EDAC MC0: CE row 3, channel ...
3
votes
3answers
2k views

Maximum memory allocation for 32bit linux kernel

I was reading this article that talks about how maximum amount of ram dedicated for kernel usage in 32 bit windows is 2GB even when the total amount of ram is >4GB. ...
3
votes
1answer
4k views

High CPU usage of flush process

I know that flush process is garbage collector of kernel, but in my case on two servers that process is really CPU intesive. In most of time it uses 80-100% of CPU. 2898 root 20 0 0 0 ...
0
votes
1answer
733 views

Xen Kernel on Debian Squeeze making 1GB memory 'absent'

Possible Duplicate: Fresh Debian Squeeze (6) Installation - Very High Ram Usage We have a Dell Poweredge R210 server with 8GB of installed RAM. This is a fresh install of Debian Squeeze, ...
3
votes
1answer
746 views

Howto force kernel to cache more files on NFS

I've a dedicated web server serving static files vía NFS. The server has 32GB of RAM, but the cached memory never grows up more than 16GB. I'm pretty sure that the SO can allocate more than this, ...
1
vote
1answer
639 views

Is linux kernel 2.6.37 80% slower than 2.6.34 using memory & threads?

If I run the command time perl -e 'use threads; $T=12 ; foreach (1..$T) { $thr[$i++] = threads->create(sub { printf "I am thread %s\n", threads->tid(); foreach (1..9e6) { push(@a, ...
1
vote
3answers
227 views

Linux Kernel RAM Limitation [edit]

I have a machine running CentOS 4 32-bit with 12 gigs of RAM. If I run the free command I see: # free total used free shared buffers cached Mem: 12409180 ...
1
vote
4answers
1k views

Running out of LowMem with Ubuntu PAE Kernel and 32GB of RAM

I'm running a Java data import process on a 32-bit Ubuntu 10 PAE kernel machine. After running the process for a while, the oom-killer zaps my Java process. After some Googling and digging through ...
1
vote
1answer
322 views

What kernel structure represents memory for tmpfs and cached/buffer reported by free/top/vmstat?

OK so here is a follow on question to link. When I create a tmpfs filesystem on t and allocate say 100MB of space, why can't I see it in slabtop or /proc/slabinfo. I thought maybe it was because it ...
0
votes
3answers
410 views

View Windows XP kernel nonpaged pool usage

Is there any sort of tool (either 3rd party or internal to Windows) to view what processes, handles, etc. are using what amount (absolute or percentage) of the kernel nonpaged memory pool in Windows ...
26
votes
3answers
16k 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 ...