Attainable memory bandwidth

From: Keith Bierman fpgroup (Keith.Bierman@Eng.Sun.COM)
Date: Sun Sep 29 1991 - 14:17:28 CDT


4/75 times.

32mb ram, sunos 4.1.1 (technically a post beta thereof; I never got around
to upgrading, and also a downrev prerelease prom .... but neither of
those things are known to affect performance). f77v1.4 patch 2 code
compiled -fast -O4 -Bstatic.

Five runs, triggered by

        for i in 1 2 3 4 5; do echo $i; a.out >> mc.out ; done

and running sans window system. I wasn't inclined to disconnect my
machine from the net; but I don't think anyone was mounting my
exported volumes and performing useful work during this test.

Timing calibration ; t = 44.0000 clicks
    
Assignment: Rate = 36.3636 MB/s MFLOPS = 0.
Scaling: Rate = 29.6296 MB/s MFLOPS = 1.85185
Summing: Rate = 38.0952 MB/s MFLOPS = 1.58730
SAXPYing: Rate = 25.2632 MB/s MFLOPS = 2.10526
Timing calibration ; t = 44.0000 clicks
    
Assignment: Rate = 36.3636 MB/s MFLOPS = 0.
Scaling: Rate = 29.6296 MB/s MFLOPS = 1.85185
Summing: Rate = 38.0952 MB/s MFLOPS = 1.58730
SAXPYing: Rate = 25.2632 MB/s MFLOPS = 2.10526
Timing calibration ; t = 44.0000 clicks
    
Assignment: Rate = 36.3636 MB/s MFLOPS = 0.
Scaling: Rate = 29.6296 MB/s MFLOPS = 1.85185
Summing: Rate = 38.0953 MB/s MFLOPS = 1.58730
SAXPYing: Rate = 25.2631 MB/s MFLOPS = 2.10526
Timing calibration ; t = 44.0000 clicks
    
Assignment: Rate = 36.3637 MB/s MFLOPS = 0.
Scaling: Rate = 29.6296 MB/s MFLOPS = 1.85185
Summing: Rate = 38.0952 MB/s MFLOPS = 1.58730
SAXPYing: Rate = 25.2632 MB/s MFLOPS = 2.10526
Timing calibration ; t = 44.0000 clicks
    
Assignment: Rate = 36.3636 MB/s MFLOPS = 0.
Scaling: Rate = 29.6296 MB/s MFLOPS = 1.85185
Summing: Rate = 38.7097 MB/s MFLOPS = 1.61290
SAXPYing: Rate = 25.2632 MB/s MFLOPS = 2.10526

totals (arithmetic mean, standard deviation):

Assignment: avg = 36.3636 stdev = 4.47214e-05 #pts 5
Scaling : avg = 29.6296 stdev = 0 #pts 5
Summing : avg = 38.2181 stdev = 0.274802 #pts 5
SAXPYing : avg = 25.2632 stdev = 4.47214e-05 #pts 5

cheers



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