topic Re: memory in Operating System - Linux

memory

Fadia Almarei — Thu, 03 Feb 2005 08:38:53 GMT

Dear All

how to monitor my memory ,and how to see the process the take the maximum resource of my memory.

BR,

Re: memory

Steven E. Protter — Thu, 03 Feb 2005 10:42:15 GMT

Attaching some sar scripts that might be useful.

They have some hp-ux statments that need to be removed.

sar comes with the os.

Also look at gtop, which runs in gnome X.

lsof can look at a single process and it utually comes with the OS.

SEP

Re: memory

xyko_1 — Thu, 03 Feb 2005 11:42:32 GMT

Hi Fadia,

if you are running text mode top is your real time monitor. You may sort the top processes by memory using M command.

Hiting h you will have the help screen.

regards,
xyko

Re: memory

NiCK_76 — Thu, 03 Feb 2005 21:36:07 GMT

Hi Fadia Almarei ,

vmstat/free/top utility are very useful for monitor memory. Press 'M' when top running , maximum memory process will be appeared.

NiCK

Re: memory

Simeon Harwood — Fri, 04 Feb 2005 04:32:50 GMT

If you want a nice GUI, and are on RedHat, then use: -
# ksysguard &

Sime.

Re: memory

Ivajlo Yanakiev — Fri, 04 Feb 2005 07:24:37 GMT

there is port for glance tool for linux it will show memory usage also all other staf kernel network and so on

Re: memory

Dave Falloon — Fri, 04 Feb 2005 11:50:28 GMT

There are some times when you don't have really good tools available to you and you have to rely on the just a ps command:

The following will help you track down memory hogs on a system if for some reason you down have top of if you've run out of forks and you need to exec a command, etc, etc.

This is a ps command with user defined outputs, I've just put memory size as the first column, then the process ID, the parent ID, the amount of CPU its using, the command name and its arguments. The w wraps the output. Then just sort.

ps -ewo "size pid ppid %cpu command args"|sort -n

You can redefine the output in pretty much any way you need depending on what you are tracking down.

--Dave

Re: memory

Fadia Almarei — Sat, 05 Feb 2005 14:24:52 GMT

thanks to all,but i want to ask a question ,i have a radius service running on redhat9 Linux server and also an oracle database my radius writes it's data on the oracle database ,i have 1GB memory on this server , i see there is shortage in memory the free i have is almost 10MB ,is this shortage of memory may affect the writing process from the radius service on the oracle, if this is the case how to solve it .

Re: memory

xyko_1 — Thu, 10 Feb 2005 06:03:41 GMT

Hi Fadia,

one important thing about Oracle performance is the configuration of SGA. You must verify if your SGA is enougth, mostly the buffer cache parameter, to permit about 90 to 95 percent of readings in memory (read hits). You may use statspack to see if it's ok.

Here you have a good document to guide you :
http://www.puschitz.com/TuningLinuxForOracle.shtml

regards,
Xyko