IBM 86884RX Installation Guide - Page 52

without modification. In fact, both x86 and 64-bit binaries can run

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applications benefit greatly from memory-resident data structures that are not possible on 32-bit operating systems. For the enterprise customer, a larger physical memory subsystem provides access to more data more quickly from system memory, since much more data can be held near the processor for faster calculations and data analysis. Large memory addressability allows larger file system caches for read-ahead and write-behind I/O operations, and also allows retention of large amounts of data in memory instead of repeatedly reading the data from disk. Combined with high memory bandwidth and a variety of performance optimization techniques, this solution provides the performance the enterprise market needs. Compatibility Another important aspect of Itanium 2 architecture is 32-bit compatibility. Understanding that many applications will never need the processing power of 64-bit computing, the chip will also support legacy software that relies on IA-32 architectures. The x86 binaries (applications running on IA-32), identical to those running on Pentium and Xeon processor-based systems, may execute on Itanium 2 without modification. In fact, both x86 and 64-bit binaries can run simultaneously on the same processor. This allows a system that is only partially converted to 64 bits to run on x450. Of course, unless the applications are recompiled, 32-bit applications will run slower on the Itanium because of emulation overhead and an inability to extract all the benefits the 64-bit platform offers. xSeries 450 is built to scale, process, and access larger amounts of data to yield significant performance increases of data compute-intensive applications than any other Intel-based server before. 38 IBM ^ xSeries 450 Planning and Installation Guide

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38
IBM
^
xSeries 450 Planning and Installation Guide
applications benefit greatly from memory-resident data structures that are
not possible on 32-bit operating systems.
For the enterprise customer, a larger physical memory subsystem provides
access to more data more quickly from system memory, since much more
data can be held near the processor for faster calculations and data analysis.
Large memory addressability allows larger file system caches for read-ahead
and write-behind I/O operations, and also allows retention of large amounts of
data in memory instead of repeatedly reading the data from disk. Combined
with high memory bandwidth and a variety of performance optimization
techniques, this solution provides the performance the enterprise market
needs.
±
Compatibility
Another important aspect of Itanium 2 architecture is 32-bit compatibility.
Understanding that many applications will never need the processing power
of 64-bit computing, the chip will also support legacy software that relies on
IA-32 architectures.
The x86 binaries (applications running on IA-32), identical to those running on
Pentium and Xeon processor-based systems, may execute on Itanium 2
without modification. In fact, both x86 and 64-bit binaries can run
simultaneously on the same processor. This allows a system that is only
partially converted to 64 bits to run on x450. Of course, unless the
applications are recompiled, 32-bit applications will run slower on the Itanium
because of emulation overhead and an inability to extract all the benefits the
64-bit platform offers.
xSeries 450 is built to scale, process, and access larger amounts of data to
yield significant performance increases of data compute-intensive
applications than any other Intel-based server before.