Technical data

Managing User Accounts
7.11 Managing System Resources
Table 7–9 (Cont.) Descriptions of SYSTEM and DEFAULT Accounts
Account Description
Maximum Detached
Processes Limit
(Maxdetach)
Specifies the maximum number of detached processes with the cited user name that
can be active at one time. MAXDETACH can also be used to control the number
of virtual terminals a user can have. To prevent the user from creating detached
processes, specify the keyword NONE. By default, a user has a value of 0, which
represents an unlimited number.
Maxdetach is a systemwide limit.
Maximum Process
Jobs Limit (Maxjobs)
Specifies the maximum number of interactive, batch, and detached processes that
can be active at one time for the cited user name.
Maxjobs is a systemwide limit.
Page File Limit
(Pgflquo)
Limits the number of pages that the user’s process can use in the system page file.
The page file provides temporary disk storage for pages forced out of memory by
a memory management operation. Pgflquo limits the total virtual address space
that can be created using the Create Virtual Address Space ($CRETVA) or Expand
Program/Control Region ($EXPREG) system services.
Pgflquo is a pooled limit.
Subprocess Creation
Limit (Prclm)
Limits the number of subprocesses a user’s process can create.
The process created when a user logs in to the system can in turn create
subprocesses. These subprocesses are all accountable to the user and share the
resources allotted to the initial process.
Prclm is a pooled limit.
Timer Queue Entry
Limit (TQElm)
Limits either of the following amounts:
• The number of entries that a user’s process can have in the timer queue
• The number of temporary common event flag clusters that a user’s process can
have
This limit does not govern the creation of permanent event flag clusters.
Timer queue entries are used in time-dependent scheduling; common event flags
are used in synchronizing activities among groups of cooperating processes.
TQElm is a pooled limit.
Default Working Set
Size (WSdef)
Sets the initial working set size limit for a user’s process.
WSdef is a nondeductible limit. If the value specified exceeds the value of WSquo,
the lesser value is used.
Working Set Extent
(WSextent)
Specifies the maximum size to which a user’s physical memory usage can grow,
independent of the system load. This enlargement of the physical memory for a
user is accomplished by the Adjust Working Set Limit ($ADJWSL) system service,
and is normally done for the user by the operating system in response to heavy
page faulting by the user.
WSextent is a nondeductible quota. This value should always be greater than or
equal to WSquo. The value is controlled by the system parameter WSMAX. Note
that PQL_MWSEXTENT will overwrite the account’s value for WSextent if PQL_
MWSEXTENT is larger than WSextent.
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7–46 Managing User Accounts