interpreting timing of ATLAS
er
below is the output from [make time] after installing ATLAS. i'm not
sure how to interpret the % that are negative or greater than 100%.
has anyone seen this before?
i have/use:
dell dimension E520/intel core duo 2
ubuntu 7.04
atlas 3.8.0
The times labeled Reference are for ATLAS as installed by the authors.
NAMING ABBREVIATIONS:
kSelMM : selected matmul kernel (may be hand-tuned)
kGenMM : generated matmul kernel
kMM_NT : worst no-copy kernel
kMM_TN : best no-copy kernel
BIG_MM : large GEMM timing (usually N=1600); estimate of asymptotic
peak
kMV_N : NoTranspose matvec kernel
kMV_T : Transpose matvec kernel
kGER : GER (rank-1 update) kernel
Kernel routines are not called by the user directly, and their
performance is often somewhat different than the total
algorithm (eg, dGER perf may differ from dkGER)
Reference clock rate=2394Mhz, new rate=1862Mhz
Refrenc : % of clock rate achieved by reference install
Present : % of clock rate achieved by present ATLAS install
single precision double precision
********************************
*******************************
real complex real
complex
--------------- --------------- ---------------
---------------
Benchmark Refrenc Pres
ent Refrenc Present Refrenc Present Refrenc Present
========= ======= ======= ======= ======= ======= ======= =======
=======
kSelMM 535.0 -251.6 525.4 -225.6 311.5 319.6
298.0 295.4
kGenMM 175.5 -251.6 175.5 -225.6 160.5 165.6
165.4 168.6
kMM_NT 145.2 -199.2 149.3 -191.9 135.3 126.7
132.3 134.1
kMM_TN 163.2 -204.9 161.1 -207.1 148.7 143.9
146.0 157.9
BIG_MM 510.1 171.8 504.0 172.3 307.7 319.7
293.0 312.2
kMV_N 113.5 26.9 216.9 0.0 58.9 66.4
97.4 104.5
kMV_T 89.9 0.0 94.6 107.4 47.2 53.7
74.1 86.6
kGER 154.2 0.0 119.4 107.4 29.1 31.3
46.8 58.9