PEEK Reference Manual
Glossary
PEEK Reference Manual — 529657-006
Glossary - 5
IOS
IOS. I/O subsystem.
Itanium Processor. The processor used in the Integrity NonStop server. Contrast with CISC
processor and RISC processor.
LDEV . See logical device.
locked pages. The pages in a processor that are not available for swapping because they
are currently assigned or are reserved for use by the operating system.
logical device. (1) A process that can be accessed as if it were an I/O device; for example,
the operator process is logical device LDEVOPR. (2) An addressable device,
independent of its physical environment. Portions of the same logical device can be
located in different physical devices, or several logical devices or parts of logical
devices can be located in one physical device. (3) The logical device number (LDEV)
or the logical I/O address for (1) or (2). See also logical I/O address.
logical I/O address. A 32-bit value that input/output processes (IOPs) use to refer to a unit
in the input/output configuration of a processor.
logical memory. The portion of virtual memory that can be accessed by a process in
nonprivileged mode.
logical page. See memory page.
low PIN. A PIN in the range 0 through 254. See also process identification number (PIN)
and high PIN.
MAB. The PEEK INTERRUPTS element that reports memory access breakpoint interrupts.
See also interrupt.
MAPPOOL. (1) A system storage pool. (2) The PEEK POOL element that reports
MAPPOOL statistics.
MAPPOOL64. (1) A system storage pool. (2) The PEEK POOL element that reports
MAPPOOL64 st
atistics.
memory manager. A system process that manages physical memory in a processor.
memory page. A unit of virtual storage. In TNS systems, a memory page cont
ains 2048
bytes. In TNS/R systems, the page size is determined by the memory manager and
can vary, depending on the processor type. In TNS/R and TNS/E systems, a memory
page contains 16,384 bytes. Contrast with disk page.
memory pool. A shared memory area in which allocation is dynamic and temporary.
message quick cell (MQC). A data structure that the message system quickly obt
ains and
uses to perform interprocess communication. The system automatically builds and
allocates MQCs as it needs them.