05-25-2011
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.
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TALAGENT(8) BSD System Manager's Manual TALAGENT(8)
NAME
talagent -- helper agent for the Transparent App Lifecycle feature.
SYNOPSIS
talagent [command [arguments]]
DESCRIPTION
The talagent daemon provides services related to the Transparent App Lifecycle feature. talagent may also be run manually as a command line
tool to output information about persistent state.
The options are as follows:
-help
Outputs usage information.
-dump bundle_id_fragment
Outputs the persistent state of an application whose bundle ID contains the given fragment, case insensitive ("textedit" for example).
You may also pass a path directly to the app's persistent state directory, usually in ~/Library/Saved Application State.
-launch bundle_id
This launches an app (in this case, TextEdit) in a manner approximating how apps get launched at login. You can pass either a bundle ID
fragment or a path to an app. The app is maintained stopped until you hit return in the launching window (or until it receives SIGCONT).
This is the easiest way to test the login scenario without needing to log in.
-casinfo [ASN]
With no arguments, outputs summary information about all apps. With one argument (an ASN), outputs the CAS record for that app.
-memory_pressure
Simulates memory pressure, which may cause apps that support automatic termination to exit. This does not actually allocate any memory.
-refresh_encryption
Rotates the bitmap encryption key, and attempts to cross-encrypt all existing window bitmaps under the new key. This is done periodically
by talagent.
HISTORY
First appeared in Mac OS X 10.7
Mac OS X September 1, 2010 Mac OS X