Download your favorite Linux distribution at LQ ISO.
Go Back > Forums > Linux Forums > Linux - Newbie
User Name
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!


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

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


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.

Old 03-04-2008, 03:49 AM   #2
LQ Veteran
Registered: Aug 2003
Location: Australia
Distribution: Lots ...
Posts: 15,937

Rep: Reputation: 2210Reputation: 2210Reputation: 2210Reputation: 2210Reputation: 2210Reputation: 2210Reputation: 2210Reputation: 2210Reputation: 2210Reputation: 2210Reputation: 2210
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
LQ Guru
Registered: Aug 2004
Location: Sydney
Distribution: Centos 6.9, Centos 7.3
Posts: 17,411

Rep: Reputation: 2397Reputation: 2397Reputation: 2397Reputation: 2397Reputation: 2397Reputation: 2397Reputation: 2397Reputation: 2397Reputation: 2397Reputation: 2397Reputation: 2397
What he said


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 > Forums > Linux Forums > Linux - Newbie

All times are GMT -5. The time now is 11:59 AM.

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