System Tunable Mapping: Tru64 UNIX to HP-UX 11i v2

shm_mni (Tru64 UNIX) versus shmmni (HP-UX)
This parameter specifies the number of System V shared memory segment identifiers in the system.
The default value of this parameter is different for Tru64 UNIX and HP-UX. The default setting is 100
for Tru64 UNIX and 400 for HP-UX. The maximum value allowed on this parameter is different for
Tru64 UNIX and HP-UX. The maximum value for Tru64 UNIX is 2^31-1; the maximum value for HP-
UX is 32768.
shm_max (Tru64 UNIX) versus shmmax (HP-UX)
This parameter specifies the maximum size (in bytes) for a System V shared memory segment.
The default value of this parameter is different for Tru64 UNIX and HP-UX. The default setting is 4 MB
for Tru64 UNIX, and 1 GB for HP-UX. The maximum value allowed on this parameter is different for
Tru64 UNIX and HP-UX. It is 2^64-1 for Tru64 UNIX; while it is any value less than or equal to
2^42
for HP-UX.
Process and Thread Attributes
The following table shows the system tuning options for process and thread attributes:
Tru64 UNIX HP-UX Dynamic
on
HP-UX
Description
max_proc_per_user maxuprc
Yes
Limits the maximum number of user
processes per user.
max_threads_per_user max_thread_proc
Yes
On Tru64 UNIX, defines the maximum
number of threads per user ID.
On HP-UX, defines the maximum number of
threads allowed per process.
max_per_proc_stack_size
maxssiz (32-bit)
or
maxssiz_64bit
(64-bit)
Yes
Maximum size, in bytes, of the stack for
any user process.
per_proc_stack_size
N/A
N/A
Default limit, in bytes, for a user process
stack.
max_per_proc_data_size
maxdsiz (32-bit)
or
maxdsiz_64bit
(64-bit)
Yes
Maximum size, in bytes, of the data
segment for any user process.
per_proc_data_size
N/A
N/A
Default limit, in bytes, for a process data
segment.
max_per_proc_address_space
N/A
N/A
Maximum usable virtual address space per
process.
per_proc_address_space
N/A
N/A
Default usable virtual address space per
process.
max_proc_per_user (Tru64 UNIX) versus maxuprc (HP-UX)
This parameter limits the maximum number of processes per user.
The default value of this parameter is different for Tru64 UNIX and HP-UX. The default for Tru64 UNIX
is 524287; the default for HP-UX is 256, and the maximum value is (nproc - 5).
6