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

max_threads_per_user (Tru64 UNIX) versus max_thread_proc (HP-UX)

For Tru64 UNIX, this parameter defines the maximum number of threads per user.

For HP-UX, this parameter defines the maximum number of concurrent threads allowed per process.

The default value of this parameter is different for Tru64 UNIX and HP-UX. The default setting is 1024

for Tru64 UNIX, and 256 for HP-UX. The maximum value allowed on this parameter is higher on

Tru64 UNIX than HP-UX. The maximum value for Tru64 UNIX is LONG_MAX; the maximum value for

HP-UX is nkthread.

max_per_proc_stack_size (Tru64 UNIX) versus maxssiz or maxssiz_64bit (HP-UX)

For Tru64 UNIX, max_per_proc_stack_size is the hard limit for the stack size per process. The

per_proc_stack_size parameter defines the soft limit for stack size, up to the hard limit

max_per_proc_stack_size.

For HP-UX, maxssiz and maxssiz_64bit define the maximum size of the stack segment for 32-bit

and 64-bit processes, respectively.

The default value of this parameter is different on Tru64 UNIX and HP-UX. The default setting is 32

MB for Tru64 UNIX, 8 MB for 32-bit process on HP-UX, and 256 MB for 64-bit process on HP-UX.

The maximum value allowed on this parameter is higher for Tru64 UNIX than HP-UX. The maximum

value for Tru64 UNIX is 0x40000000000; the maximum value for HP-UX is 0x17F00000 (32-bit)

and 0x80000000 (64-bit).

max_per_proc_data_size (Tru64 UNIX) versus maxdsiz or maxdsiz_64bit (HP-UX)

For Tru64 UNIX, max_per_proc_data_size is the hard limit for data segment size per process.

The per_proc_data_size parameter defines the soft limit for data segment size up to the hard

limit max_per_proc_data_size.

For HP-UX, maxdsiz and maxdsiz_64bit define the maximum size, in bytes, of the data segment

for any user process.

The default value of this parameter is different for Tru64 UNIX and HP-UX. The default setting is 1 GB

for Tru64 UNIX, 1 GB for 32-bit processes on HP-UX, and 4 GB for 64-bit processes on HP-UX. The

maximum value allowed on this parameter is higher for Tru64 UNIX than HP-UX. The maximum value

for Tru64 UNIX is 0x40000000000; the maximum value for HP-UX is 0xfffff000 (32-bit) and

0x3ffbffff000 (64-bit).

Note: For more information on hard and soft limits on Tru64 UNIX, refer to the

ulimit(1) and

getrlimit(2)/setrlimit(2) online reference pages. On HP-UX, the maxtsiz and maxtsiz_64bit

tunables define the maximum size, in bytes, of the text segment for any user process. These two

tunables do not exist on Tru64 UNIX.