memory

[Fadia Almarei]

Dear All

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

BR,

[Steven E. Protter · Accepted solution]

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

[xyko_1]

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

[NiCK_76]

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

[Simeon Harwood]

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

Sime.

[Ivajlo Yanakiev]

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

[Dave Falloon]

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

[Fadia Almarei]

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 .

[xyko_1]

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