memory bandwidth of ETA-10E and MIPS RC6280

From: tmaeno@cc.titech.ac.jp
Date: Thu Oct 03 1991 - 01:16:13 CDT


Dear Prof. John D. McCalpin,

  I ran stream_{sd}.f on ETA-10E and MIPS RC6280.

  Very interesting.

                        Toshinori Maeno
                        Associate Professor
                        Computer Center, Tokyo Institute of Technology
============================================================================

Date 1991-10-04
Run on ETA-10E (Computer Center, Tokyo Institute of Technology)
Clock speed 10.5ns
Using only one processor
ETA Unix
ftn77 103.7
vectorized

array size(n) 5000000

--------------------------------------
 Single precision appears to have 14 digits of accuracy
 Assuming 8 bytes per default REAL word
--------------------------------------
 Timing calibration ; time = 8.0634412473998 hundredths of a second
 Increase the size of the arrays if this is <30 and your clock precision is =
<1/100 second
 ---------------------------------------------------
Function Rate (MB/s) RMS time Min time Max time
Assignment: 2974.7025 0.0269 0.0269 0.0270
Scaling : 3010.5016 0.0266 0.0266 0.0266
Summing : 4357.4942 0.0276 0.0275 0.0276
SAXPYing : 4214.7701 0.0285 0.0285 0.0285

=============================================================================

Run on MIPS RC6280 (Computer Center, Tokyo Institute of Technology)
  60 MHz
  16kB primary data cache
 512kB secondary cache

RiscOS/4.52
f77 2.11
  option -O -mips2
array size(n) = 400000
--------------------------------------
 Double precision appears to have 16 digits of accuracy
 Assuming 8 bytes per DOUBLEPRECISION word
--------------------------------------
 Timing calibration ; time = 30.00000026077032 hundredths of a second
 Increase the size of the arrays if this is <30
  and your clock precision is =<1/100 second
 ---------------------------------------------------
Function Rate (MB/s) RMS time Min time Max time
Assignment: 53.3335 0.1232 0.1200 0.1400
Scaling : 58.1815 0.1232 0.1100 0.1300
Summing : 56.4706 0.1801 0.1700 0.1900
SAXPYing : 56.4706 0.1801 0.1700 0.1900



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