02-06-2014
Quote:
Originally Posted by
dzodzo
How can i tell what will be the maximum kernel memory? We measured this after reboot and starting the applications, kernel took only 2 GB but during 4 months it gradually grew to 13 GB. What would happen if i configured applications to take let's say 60 GB of memory. Will AIX handle that and live with 4 GB for kernel or will it start trashing until reboot is necessary?
I do not know a formula too calculate the minimum for kernel memory.
As you said the memory usage will grow with time and usage (mbufs, inode cache, jfs bufstructs, etc.) and the increase depends on the maximum installed memory. The Kernel used pinned memory (vmstat -v) and if your application with 60GB also used pinned memory, your server will crash/panic if there are no more memory which can be pinned. That happened to us after two weeks with a wrong Informix memory configuration. The other way the server starts to swap out (paging space) and the performance slows down.
Regards
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LEARN ABOUT HPUX
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)