MPE/iX 5.5 Operating System Limits

now supports 4679 devices. The entry size is 5 CM words. Subentries do not exist since
4.7.
The XDD has one 5 CM word header for the table itself. This contains various linkage
information, as well as information about the current number of "sectors" allocated.
There is an entry for each LDEV on the system. Non-sharable devices which include all
terminals (both nailed and non-nailed), virtual terminals (VT), non-spooled printers and
tape drives can have a reallocation entry.
Summary of values
- Size of header for XDD table is 5 CM words
- Size of entry for each device configured is 5 CM words
- Size of reallocation entry for each device configured is 5 CM words
The maximum number of XDD entries is the maximum number of LDEVS which is
4679. The maximum number of reallocation entries is 1847.
(7) Log id table - DST033
When a user creates a new logid through the :GETLOG command, an entry is added to
the LOG ID table. This table is created large enough to contain 128 entries. This limits
the system to a total of 128 user logging IDs.
(8) Log table - DST027
When a User Logging process is started through the :LOG command (with either the
START or RESTART option) an entry is added to the LOG Table. The log table is
created large enough to contain 128 entries. This limits the system to a maximum of 128
User Logging IDs in use concurrently.
NOTE: A single User Logging ID can be used by multiple processes/programs
concurrently. See discussion of Processes Per User Logging ID - LOG BUF DST - in this
section.
(9) Log buf DST