IBM S/390 Multiprise 3000 Reference Manual - page 19
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Linux for S/390
Linux for S/390 is a pure Linux. It is not a Linux per-
sonality on another operating system, nor is it a spe-
cial unique version of Linux adapted specially for the
S/390 processor. It is Linux, the same Linux that runs
on Intel
®
processors, RISC processors, and others. It
has the same characteristics on S/390 that it would on
other platforms, for example it’s a pure ASCII environ-
ment. However, it does take advantage of many of the
features of S/390 hardware like IEEE Floating Point.
Glossary
Asynchronous Data Mover Facility (ADMF).
Improves the process of moving data between central
hiperpools; hiperpools use expanded storage to provide
much larger DB2 buffer pools than available in the past.
IBM testing has shown DB2 hiperpools can provide up to
a 30% response time reduction and 13% ITR improve-
ment for OLTP, and up to a 50% reduction in elapsed
time for query processing. These benefits are mainly due
to ADMF's ability to support larger buffer pools than pos-
sible without ADMF.
The "Asynchronous" part of ADMF is that processing
offloaded from the central processors (CPs), freeing
them for other work. In the S/390 Multiprise, the move-
ment is performed by the System Assist Processor (SAP).
Asynchronous Pageout Facility.
Movement of a page from central to expanded storage is
normally synchronous. This means that the task waits
until the move completes before continuing execution.
The Asynchronous Pageout Facility allows instruction
execution to continue while the move occurs. This facil-
ity, while active in all environments, is expected to show
a significant benefit (for example, significant reduction in
processor time) only in environments that generate a
high volume of in-storage paging such as numerically
intensive computing using large data structures.
Basic mode.
A central processor mode that does not use logical parti-
tioning. Contrast with logically partitioned (LPAR) mode.
Central Processing Complex (CPC).
A physical collection of hardware that consists of main
storage, one or more central processors, timers and
channels.
Central processor (CP).
The part of the computer that contains the sequencing
and processing facilities for instruction execution, initial
program load and other machine operations.
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