LinuxQuestions.org
Did you know LQ has a Linux Hardware Compatibility List?
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - General
User Name
Password
Linux - General This Linux forum is for general Linux questions and discussion.
If it is Linux Related and doesn't seem to fit in any other forum then this is the place.

Notices

Reply
 
Search this Thread
Old 12-12-2003, 12:54 AM   #1
ganninu
Member
 
Registered: Jul 2003
Distribution: RH 7.3/8.0/9.0, Debian Stable 3.0, FreeBSD 5.2, Solaris 8/9/10,HP-UX
Posts: 340

Rep: Reputation: 30
Linux and Memory usage


I want to know a bit from you guys if my linux system behaves the same as yours, and possibly some possible logical reason for this.

The box has 612.48MB of RAM and I remember that the after a fresh reboot the amount of memory used is very minimal. After some uptime I can see that the amount of memory sued becomes to increment day by day. After an uptime of 3 days 12 hours 56 minutes, I have only 24.69MB of memory left, and for the first time I've had Debian, i'm realising that 4.18MB are being used from the Swap memory.. Does this mean that if i leave for some 5 weeks, my machine will be crawling like a snail due to lack of memory??

Something else related maybe to box specs, what are bogomips??

My only services running are an apache server which only me uses, so i don't think it consumes much memory, and the X-server.

thanks a lot,
ganninu.
 
Old 12-12-2003, 03:24 AM   #2
320mb
Senior Member
 
Registered: Nov 2002
Location: pikes peak
Distribution: Slackware, LFS
Posts: 2,577

Rep: Reputation: 47
do you have /var on it's own "seperate" partition??
 
Old 12-12-2003, 03:37 AM   #3
LinuxLala
Senior Member
 
Registered: Aug 2003
Location: New Delhi, India
Distribution: Fedora 7
Posts: 1,305

Rep: Reputation: 45
well the X is a real memory hog.

Try doing 'top' at command line to see what all services are running without your knmowledge.

You obviously dont put the quotes
 
Old 12-12-2003, 03:50 AM   #4
ganninu
Member
 
Registered: Jul 2003
Distribution: RH 7.3/8.0/9.0, Debian Stable 3.0, FreeBSD 5.2, Solaris 8/9/10,HP-UX
Posts: 340

Original Poster
Rep: Reputation: 30
hehe i found out about the services by doing top actually i have those services i mentioned. As regards to my partitioning, '/var' is not on a separate partition...
 
Old 12-12-2003, 11:44 AM   #5
LinuxLala
Senior Member
 
Registered: Aug 2003
Location: New Delhi, India
Distribution: Fedora 7
Posts: 1,305

Rep: Reputation: 45
Regarding ur bogomips
http://www.magnux.org/doc/howto/en/m...ps-2.php#ss2.1
 
Old 12-12-2003, 02:16 PM   #6
mac_phil
Member
 
Registered: Sep 2003
Distribution: Mandrake 10.0
Posts: 200

Rep: Reputation: 30
No! Your computer will not be running like a snail in five weeks.

This is how Linux works. You paid for those 600+ megs; be thankful they're getting used!

Linux approach to memory is this: if you aren't using it, you're wasting it.

Your memory is full of cached data. When an app needs more memory, data is removed from the cache.

Check out my two computers:

This one is doing nothing at all:
top - 14:45:49 up 5 days, 3:07, 2 users, load average: 0.00, 0.00, 0.00
Tasks: 48 total, 1 running, 47 sleeping, 0 stopped, 0 zombie
Cpu(s): 2.1% user, 0.5% system, 0.6% nice, 96.7% idle
Mem: 126228k total, 123324k used, 2904k free, 7020k buffers
Swap: 506008k total, 9424k used, 496584k free, 34288k cached

This one is running a mailserver, OpenOffice, Kmail, IRSSI, Pine, Evolution, XPDF, and probably a bunch of other stuff:
top - 14:42:12 up 4 days, 18:55, 7 users, load average: 0.01, 0.04, 0.00
Tasks: 98 total, 1 running, 97 sleeping, 0 stopped, 0 zombie
Cpu(s): 6.7% user, 1.8% system, 0.2% nice, 91.3% idle
Mem: 191060k total, 187332k used, 3728k free, 6560k buffers
Swap: 385520k total, 61608k used, 323912k free, 90292k cached



Last edited by mac_phil; 12-12-2003 at 02:49 PM.
 
Old 12-12-2003, 03:12 PM   #7
ac1980
Member
 
Registered: Aug 2003
Location: Trento, Italy
Distribution: Debian testing
Posts: 394

Rep: Reputation: 30
I think mac_phil is right: here's my 'free' output (I have a loaded system):
Code:
camera:/home/ale# free
                       total       used       free     shared    buffers     cached
 Mem:                  190408     183876       6532          0      16524      78316
-/+ buffers/cache:                 89036     101372
Swap:                  554168     164368     389800
This means 6.5M are unused, but 100M hold cached data, so the are eligible to be freed on demand.
If you want to access disk data that is in this cache, you'll have it in microseconds
Note that if an application is idle for a long time (e.g. a shell you're not using) it will be likely swapped to make your cache bigger.

Also note that (unlike winnt) linux will NEVER write to swap security-related information such as encripted fs info or passwords (unless you use badly-careless applications, of course).

Last edited by ac1980; 12-12-2003 at 03:21 PM.
 
Old 12-13-2003, 01:00 AM   #8
ganninu
Member
 
Registered: Jul 2003
Distribution: RH 7.3/8.0/9.0, Debian Stable 3.0, FreeBSD 5.2, Solaris 8/9/10,HP-UX
Posts: 340

Original Poster
Rep: Reputation: 30
thanks for your response guys. now i understand why linux is faster than windows.
 
Old 12-15-2003, 07:33 AM   #9
LinuxLala
Senior Member
 
Registered: Aug 2003
Location: New Delhi, India
Distribution: Fedora 7
Posts: 1,305

Rep: Reputation: 45
I learnt a lot about Linux due to this discussion. Thanks all!
 
  


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 On
HTML code is Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Memory Usage on Linux lchand_p Linux - Software 2 06-19-2006 06:17 AM
Linux kernel memory usage.. drminix Linux - Software 1 08-14-2005 05:47 PM
getting realtime info on memory usage-cpu and harddrive usage steering Linux - Newbie 5 03-03-2005 08:43 PM
how to determine cpu usage, memory usage, I/O usage by a particular user logged on li rags2k Programming 4 08-21-2004 04:45 AM
Linux Memory usage Boomba Linux - General 8 03-25-2004 04:16 PM


All times are GMT -5. The time now is 07:58 PM.

Main Menu
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