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.