Re: Attainable Memory Bandwidth (update)

From: Chris Siebenmann (cks@hawkwind.utcs.toronto.edu)
Date: Wed Oct 02 1991 - 23:35:40 CDT


 Some results, from a DECSystem 5000/200 with the DEC Fortran 3.0
Fortran compiler:

! From: The Batch Daemon <batch@rw.cquest.toronto.edu>
! Subject: on server.rw: Success+Output: 'cfq246008106' in 'now' queue
!
! Job 'cfq246008106' in 'now' queue has completed successfully.
! Total CPU used: 42.3 sec.
! Command list follows:
!
! ./a.out; ./a.out; ./a.out; ./a.out
!
! Output follows:
!
! --------------------------------------
! Double precision appears to have 16 digits of accuracy
! Assuming 8 bytes per DOUBLEPRECISION word
! --------------------------------------
! Timing calibration ; time = 50.38740262389183 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: 28.5786 0.1792 0.1680 0.1992
! Scaling : 24.5776 0.2024 0.1953 0.2148
! Summing : 24.2542 0.3131 0.2969 0.3320
! SAXPYing : 23.0415 0.3302 0.3125 0.3672
! --------------------------------------
! Double precision appears to have 16 digits of accuracy
! Assuming 8 bytes per DOUBLEPRECISION word
! --------------------------------------
! Timing calibration ; time = 49.99680016189814 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: 28.5786 0.1715 0.1680 0.1758
! Scaling : 24.5776 0.1977 0.1953 0.2031
! Summing : 24.2542 0.3008 0.2969 0.3047
! SAXPYing : 23.0415 0.3172 0.3125 0.3203
! --------------------------------------
! Double precision appears to have 16 digits of accuracy
! Assuming 8 bytes per DOUBLEPRECISION word
! --------------------------------------
! Timing calibration ; time = 49.60619788616896 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: 28.5786 0.1711 0.1680 0.1719
! Scaling : 24.5776 0.2000 0.1953 0.2031
! Summing : 23.9392 0.3035 0.3008 0.3125
! SAXPYing : 23.0415 0.3180 0.3125 0.3281
! --------------------------------------
! Double precision appears to have 16 digits of accuracy
! Assuming 8 bytes per DOUBLEPRECISION word
! --------------------------------------
! Timing calibration ; time = 49.99680034816265 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: 28.5786 0.1711 0.1680 0.1719
! Scaling : 24.5776 0.1980 0.1953 0.1992
! Summing : 23.9393 0.3057 0.3008 0.3398
! SAXPYing : 23.0415 0.3185 0.3125 0.3437

---
		">NFS only behaves properly ...
		 ...when the computer is not drawing power."
			- Root Boy Jim
cks@hawkwind.utcs.toronto.edu	           ...!{utgpu,utzoo,watmath}!utgpu!cks



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