This is a test on dec alpha 3000/900 275 Mhz with 320 MB memory ( to best
of my knowledge )
f77 -O5 -fast.
----------------------------------------------
Double precision appears to have 16 digits of accuracy
Assuming 8 bytes per DOUBLE PRECISION word
----------------------------------------------
Array size = 2000000
Offset = 0
The total memory requirement is 45 MB
You are running each test 10 times
The *best* time for each test is used
----------------------------------------------------
Your clock granularity/precision appears to be 976 microseconds
The tests below will each take a time on the order
of 238144 microseconds
(= 244 clock ticks)
Increase the size of the arrays if this shows that
you are not getting at least 20 clock ticks per test.
----------------------------------------------------
WARNING: The above is only a rough guideline.
For best results, please be sure you know the
precision of your system timer.
----------------------------------------------------
Function Rate (MB/s) RMS time Min time Max time
Assignment: 87.4314 0.3781 0.3660 0.3855
Scaling : 85.8296 0.3810 0.3728 0.3865
Summing : 84.0689 0.5856 0.5710 0.5973
SAXPYing : 83.2154 0.5853 0.5768 0.5973
Sum of a is : 2.306601562496167E+018
Sum of b is : 4.613203125026281E+017
Sum of c is : 6.150937500085024E+017
cc -O4
-------------------------------------------------------------
This system uses 8 bytes per DOUBLE PRECISION word.
-------------------------------------------------------------
Array size = 2000000, Offset = 0
Total memory required = 45.8 MB.
Each test is run 10 times, but only
the *best* time for each is used.
-------------------------------------------------------------
Your clock granularity/precision appears to be 16666 microseconds.
Each test below will take on the order of 266666 microseconds.
(= 16 clock ticks)
Increase the size of the arrays if this shows that
you are not getting at least 20 clock ticks per test.
-------------------------------------------------------------
WARNING: The above is only a rough guideline.
For best results, please be sure you know the
precision of your system timer.
-------------------------------------------------------------
Function Rate (MB/s) RMS time Min time Max time
Assignment: 83.4783 0.3934 0.3833 0.4000
Scaling : 83.4783 0.4001 0.3833 0.4167
Summing : 84.7059 0.5851 0.5667 0.6000
SAXPYing : 84.7059 0.5801 0.5667 0.6000
This archive was generated by hypermail 2b29 : Tue Apr 18 2000 - 05:23:05 CDT