Various servers:

Type                     Nodes
------------------------------------------
                  1      2      4      8

*8400 5/625      0.96   0.51   0.27   0.14
*8400 5/440      1.25   0.63   0.33   0.17
*8400 5/300      1.76   0.89

*4100 5/300      1.80   0.92   0.48


Previous timings:

Timing in seconds for MbCO + 3830 water molecules (14026 atoms), 1000 steps 12-14 A shift on a four processor Digital AlphaServer 8400 5/300.

Nodes             1          2    

E ext 6447.5 3010.2 E int 45.7 25.2 Wait 0.0 48.1 Comm 0.1 17.5 List 362.2 184.5 Integ 21.0 9.6 Total 6876.2 3295.2 Total(hours) 1.91 0.92 Eff 100.0% 104.1% Speedup 1.0 2.1

E ext : External energy terms (electrostatics + Lenard-Jones) E int : Internal energy terms (bond, angle, dihedral) Wait : Load unbalance Comm : Communication time (Vector Distr. Global {Sum,Brdcst}) List : Nonbond list generation time Integ : Time needed to integrate equations of motion Total : Total elapsed time Eff : Efficiency = speedup divided by number of nodes Speedup: Time for one node divided by time for N nodes.

Comments

See DEC WWW pages for more details

Note

It is a four processor Digital AlphaServer 8400 5/300, running under OSF/1 v. 3.2.