Any Additional Steps After Adding New RAM To Sever? Post: 302524927

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Operating Systems AIX Any Additional Steps After Adding New RAM To Sever? Post 302524927 by zaxxon on Wednesday 25th of May 2011 05:38:39 AM

05-25-2011

Registered User

a)
Usually not - many parameters regarding memory are percentage based. Others have fixed values. When doubling the memory it should usually run smoother than before if there was a memory shortage or no tuning.

b)
Not easy to say this way. When using lru_file_repage=0, it is recommended to have maxperm% back to 80 which is default and depending on memory usage, some do even set 85 or 90.
A box running out of memory will usually start to page out, before anything crashes, and sowith become very slow. I heared once that Java dislikes to be paged out - not sure if this is true or still a problem though. It could also be that you can increase memory usage inside your application server (I am not very familiar with java but heapsize stuff etc. come to my mind), especially after having added real memory.

Post a vmstat -vs and a svmon -G. It could also be, that the ulimits for the user where this application is running, has too tight limits. A ulimit -a issued from that user will show the current limits.

That as a start.

zaxxon

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services.window

services.window(4)					     Kernel Interfaces Manual						services.window(4)

NAME

       services.window - file containing applications and their associated memory window ID

DESCRIPTION

       The file is used by applications using memory windows.

       Each  line in the file associates an application with a memory window ID.  A line in the file cannot start with a space or tab.	The format
       is a unique name, defining the application, followed by a space/tab, followed by a unique window_id.  See the sample file in

       Memory windows allows for the starting of a process in a unique or existing memory window where it can create and share objects with  other
       applications in the same memory window.

       The creation of memory windows removes the system wide restriction on shared resources.	Without memory windows, 32-bit processes were lim-
       ited to 1.75 gigabytes of shared resources.  Each memory window allows for the definition of a unique 1 gigabyte quadrant and since  multi-
       ple  memory  windows  can  be defined in a system, the system total for shared resources can exceed the 1.75 gigabyte limitation for 32 bit
       processes.

       The definition of a memory window is only available for 32-bit processes.

       The file provides a central place for memory window applications to associate their memory window IDs.  In the event there are  any  colli-
       sions,  only  a	change	in is necessary to select another memory window for the entire application.  If is not used, and user applications
       hard code window IDs in their startup scripts, collisions are not easily detected or easily fixed.

       A memory window application uses the command getmemwindow(1M) to extract the application's window_id from the file, and then passes that ID
       to the setmemwindow(1M).

       Using the same window ID places applications in the same memory window.

EXAMPLES

       Below is a example of a file.

AUTHOR

       was developed by HP.

FILES

       File containing applications' associated window ID.

SEE ALSO

       getmemwindow(1M), setmemwindow(1M).

       on

																services.window(4)