WebSphere eXtreme Scale Administration Guide > Plan application deployment > Tuning performance
ORB properties and file descriptor settings
ORB properties
The ORB is used by eXtreme Scale to communicate over a TCP stack. Properties are set in...
java/jre/lib/orb.properties fileFor a heavy load of large objects, enable ORB fragmentation...
com.ibm.CORBA.FragmentSize=<right size>
Prevent ThreadPool growth by specifying the following setting:
com.ibm.CORBA.ThreadPool.IsGrowable=false
Set proper timeouts to avoid excess threads in an abnormal situation by specifying the following settings:
- com.ibm.CORBA.RequestTimeout
- com.ibm.CORBA.ConnectTimeout
- com.ibm.CORBA.FragmentTimeout
File descriptor
UNIX and Linux systems there is a limit to the number of open files allowed per process. The operating system specifies the number of open files permitted. If this value is set too low, a memory allocation error will occur on AIX, and too many files opened are logged.
In the UNIX system terminal window, set this value higher than the default system value. For large SMP machines with clones, set to unlimited.
For AIX configurations set this value to -1 (unlimited) with the command ulimit -n -1.
For Solaris configurations set this value to 16384 with the command ulimit -n 16384.
To display the current value use the command ulimit -a.
Parent topic
Tune performance