LinuxQuestions.org
Help answer threads with 0 replies.
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Newbie
User Name
Password
Linux - Newbie This Linux forum is for members that are new to Linux.
Just starting out and have a question? If it is not in the man pages or the how-to's this is the place!

Notices



Reply
 
Search this Thread
Old 03-04-2008, 03:23 AM   #1
quekym
LQ Newbie
 
Registered: Mar 2008
Posts: 1

Rep: Reputation: 0
Weird Memory Usage behaviour on Redhat Linux Enterprise 4!!


Hi,

Iam new to Linux and have installed Redhat Linux Enterprise 4. I have noticed that the behaviour of memory usage to be weird. From the default startup, using "Free" , i checked the available memory to be 863836K. i left the system over 4 days without touching it. Upon checking, the available memory drops to 447528K. This is approximately 48% lost. No 3rd party application was installed yet.

Have a few questions
1) Is this a memory leak in RHEL4? Do I have a patch for it?
2) I notice that the cached memory is approx the size lost from the available memory, what is the behaviour of this cache and why wasn't the cache returned to to available memory?
3) Will the system crash ? I have yet to observe a bench mark for it to stabilise or have seen it reaching zero.
4) what is the best way to optimise the system? example killing of cpuspeed daemon,setting huge page file...etc

Appreciate your kind advice.

Regards,
Charles
 
Old 03-04-2008, 03:49 AM   #2
syg00
LQ Veteran
 
Registered: Aug 2003
Location: Australia
Distribution: Lots ...
Posts: 12,497

Rep: Reputation: 1077Reputation: 1077Reputation: 1077Reputation: 1077Reputation: 1077Reputation: 1077Reputation: 1077Reputation: 1077
Answers:
1) no, and no
2) (disk/page) cache is for performance. It will be "returned" when applications require it. Usually.
3) probably not, but maybe. In normal operation it won't reach zero.
4) leave it alone.

A use of the "search" button would have found plenty of relevant threads - including several pointing to this (excellent) article on the gentoo wiki - here.
 
Old 03-04-2008, 06:03 AM   #3
chrism01
Guru
 
Registered: Aug 2004
Location: Sydney
Distribution: Centos 6.6, Centos 5.10
Posts: 16,324

Rep: Reputation: 2041Reputation: 2041Reputation: 2041Reputation: 2041Reputation: 2041Reputation: 2041Reputation: 2041Reputation: 2041Reputation: 2041Reputation: 2041Reputation: 2041
What he said
 
  


Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
weird memory usage newlinuxnewbie Linux - General 2 11-23-2005 05:35 PM
Memory Usage In Enterprise Kernel fishlet Linux - General 2 02-28-2004 06:52 PM
memory failure behaviour -- redhat enterprise ES jini555 Linux - Hardware 0 12-18-2003 02:11 PM
RedHat 9 memory usage: is this normal? Bjornkri Linux - Newbie 2 06-03-2003 04:49 AM
redhat 7.2 df usage is weird chens_83 Linux - General 2 10-29-2002 07:49 PM


All times are GMT -5. The time now is 08:46 AM.

Main Menu
Advertisement
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
identi.ca: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration