04-09-2019
A Unix-compatible process table is still fixed. Only LWPs are not limited on some OS.
In AIX, according to my link, it is 262144. Not tunable.
Solaris and HP-UX have 30000, tunable.
Linux has 32768, shared with LWPs, tunable.
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msgssz(5) File Formats Manual msgssz(5)
NAME
msgssz - number of bytes in a System V IPC message segment (OBSOLETE)
DESCRIPTION
The tunable is obsolete and has been removed.
This tunable specified the size, in bytes, of a "segment" of memory space reserved for storing IPC messages. This tunable is replaced by
the tunable msgmbs(5) (The maximum (in megabytes) kernel memory to be used for messages waiting to be received.)
For more information about System V message queues, refer to the section of the mesg(5) manpage.
WARNINGS
All HP-UX kernel tunable parameters are release specific. This parameter has been obsoleted for HP-UX 11i Version 3 and forward.
AUTHOR
was developed by AT&T.
SEE ALSO
msgsnd(2), mesg(5), msgmbs(5), msgmap(5), msgmax(5), msgmnb(5), msgmni(5), msgseg(5), msgtql(5).
OBSOLETE
Tunable Kernel Parameters msgssz(5)