Installation guide

1 GB. However, in many cases, available swap space may be exhausted
before this limit is reached.
You can increase the available virtual address space to a maximum of 4
TB by modifying the value of the vm-maxvas attribute in the vm
subsystem. For more information about setting this attribute, see the
System Configuration and Tuning guide.
• Page size
The physical page size is 8 KB and cannot be changed. The page size is
hardware dependent and is set by the console at boot time.
A.1.3 Process Limits
The process limits for the system and for users are as follows:
• Per system
The maxusers attribute in the proc subsystem specifies the number of
simultaneous users that a system can support without straining system
resources. System algorithms use the maxusers attribute to size
various system data structures, and to determine the amount of space
allocated to system tables, such as the system process table, which is used
to determine how many active processes can be running at one time.
The default value assigned to the maxusers attribute depends on the
size of your system. The default value is 32 users on systems with at
least 64 MB of physical memory. The minimum value is 8 and the
maximum value is 4096.
The maximum number of tasks that can run simultaneously on a system
is determined by the value of the task-max attribute in the proc
subsystem. The default value is 8213. The minimum value is 85, and
the maximum value is 32768.
The maximum number of kernel threads that can run simultaneously on a
system is determined by the value of the thread-max attribute in the
proc subsystem. The default value is 16424. The minimum value is
160, and the maximum value is 262136.
• Per user
The maximum number of processes that a user can create is determined
by the value of the max-proc-per-user attribute in the proc
subsystem. The default value is 64. The minimum value is 0, and the
maximum value is 32767.
The maximum number of threads that a user can create is determined by
the value of the max-threads-per-user attribute in the proc
subsystem. The default value is 256. The minimum value is 0, and the
maximum value is 18,446,744,073,709,551,615 (2
64
− 1).
A–2 System Limits