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| 英文描述： | Benchmarking the Am186EM: Using the Dhrystone V2.1 As An Example Application Note? 1.66MB (PDF) |
| 中文描述： | 基準(zhǔn)Am186EM：作為示例應(yīng)用注意Dhrystone的V2.1版本？ 1.66MB（PDF格式） |
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65
Appendix B
Summary of Processors
Below is a summary of computer systems and their processors running both
Dhrystone 1.1 and Dhrystone 2.1.
The Header test defines the data and explains how an updated version of this
report can be obtained. Dhrystone 2.1 and 1.1 MIPS Results (Language: C).
The Dhrystone programs are by Reinhold Weicker. His email address is:
weicker.muc@sni.de (in general), or weicker.muc@sni-usa.com (from North
America).
Dhrystone is a short synthetic benchmark program intended to be representative
for system (integer) programming. Based on published statistics on use of
programming language features: see original publication in CACM 27,10 (Oct
1984). Orginally published in ADA, now mostly used in C. Version 2 (in C)
published in SIGPLAN Notices 23,8 (Aug 1988), together with measurement
rules. Version 1 is no longer recommended since state-of-the-art compilers can
eliminate too much 'dead code' from the benchmark (However, quoted MIPS
numbers are often based on version 1). Problems: Due to its small size (100
HLL statements, 1-1.5 KB code), the memory system outside the cache is not
tested; compilers can too easily optimize for Dhrystone; string operations are
somewhat over-represented.
Recommendation: Use it for controlled experiments only; don't blindly trust
single Dhrystone MIPS numbers quoted somewhere (don't do this for any
benchmark). The Dhrystone C Programs (dhry.shar), and latest table of results
(dhry.tbl) are available via anonymous ftp from 'ftp.nosc.mil' in directory
'pub/aburto'. The ftp.nosc.mil IP address is: 128.49.192.51 .
Please send new results (systems, machines, compilers, compiler options) to
'aburto@marlin.nosc.mil'. I will keep results updated, post to 'comp.benchmarks'
periodically, and send results to Reinhold Weicker.
Please read the 'dhry.doc' file first for information regarding running the
programs and submitting results. If you need the individual files please send
email to aburto@marlin.nosc.mil . These Dhrystone source and results are also
available via ftp from netlib@ornl.gov .
The VAX 11/780 MIPS reference is 1757 for both Dhrystone V1.1 and V2.1. I
used the same VAX 11/780 MIPS reference (1757) for both V1.1 and V2.1 since
the results for unoptimized code in general were very similar, if not identical, in
this case. Reinhold Weicker recommended that both V1.1 and V2.1 MIPS
results be collected in this table as this would give a reference on how much
more V1.1 can be optimized relative to V2.1. When quoting Dhrystone VAX
MIPS ratings it is preferrable to use the V2.1 numbers. Reinhold Weicker has
asked me to add the following statement: "Dhrystone author says: Relying on
MIPS V1.1 numbers can be hazardous to your professional health" ... Some
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