IBM Understanding BPXPRMXX and PARMLIB Parameters for z/OS System Tuning

Z / O S

S Y S T E M T U N I N G

In the PARMLIB member BPXPRMxx check the values of the following parameters:

Table 15: z/OS System Tuning

Parameter	Value	Additional Information
MAXPROCSYS	15000	System will allow at most 15000	processes to be
		active concurrently.
MAXPROCUSER	15000	Allow each user (same UID) to have at most 15000
		concurrent processes active.
MAXUIDS	200	Allow at most 200 z/OS UNIX	users to be active
		concurrently.
MAXFILEPROC	65535	Allow at 65535 open files per user.
MAXPTYS	800	Allow up to 800 pseudo-terminal sessions
MAXTHREADTASKS	5000	System will allow at most 5000 threads tasks to be
		active concurrently in a single process
MAXTHREADS	10000	System will allow at most 10000 threads to be active
		concurrently in a single process.
MAXMMAPAREA	40960	System will allow at most 40960 pages to be used for
		memory mapping.
MAXFILESIZE	NOLIMIT	Unlimited file size.
MAXCORESIZE	4194304
MAXASSIZE	2147483647	This size is same as the region size for TSO. By
		default USS ids get some pre-defined minimum
		which is usually not enough for WPS kind of stuff. To
		avoid problems instantiating java processes this size
		should be set to 214783647.
MAXCPUTIME	2147483647	To improve the CPU process time.
MAXSHAREPAGES	32768000	System will allow at most 32768000 pages of shared
		storage to be concurrently in use.

Required Fixes

The following fix is required to apply in WebSphere Portal Version 6.1 Solaris environment.

PK73368: Cache synchronization issue, deadlocks can occur in the CacheOnRequest class. This fix is included in WebSphere Portal 6.1.0.1 and later.

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W E BS P HE R E P O R T AL V 6 . 1 T U N I N G G U I D E