Comments

The results for Athlon are from 700MHz AMD K7 using g77-2.95.2/glibc-2.1.1 (Debian)

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The results for PentumPro are made on a dual pentium pro PC with 128 MB of memory and absoft F77 compiler See Absoft WWW pages.


Comparison of compilers on PentiumII (400MHz)
=========================================================
version of CHARMM = c26n2
date of testing = May 7, 1998
OS = GNU/Linux (RedHat 5.0/glibc-2.0.7)

Timing in hours.
In [] is ratio with the best time in the same column.


A. MbCO + 3830 waters (1000 steps)
---------------------------------------
   compiler           PentiumII/400MHz 
                                       
   PGI f77               1.03   [1.00]
   g77/egcs-1.0.3        1.20   [1.17] 
   f2c/gcc-2.8.1         1.12   [1.09] 
   f2c/gcc-2.7.3.2       1.20   [1.17] 
                                       
                                       
B. MbCO + 4985 waters (100 steps) [PME]
---------------------------------------
                                       
   compiler           PentiumII/400MHz 
                                    
   PGI f77               0.227  [1.00]
   g77/egcs-1.0.3        0.285  [1.26] 
   f2c/gcc-2.8.1         0.299  [1.32] 
   f2c/gcc-2.7.3.2       0.284  [1.25] 


Comparison of compilers on PPro (200MHz) and PII (300MHz)
=========================================================
version of CHARMM = c26a1-PREa2
date of testing = Feb 11, 1998
OS = Debian 2.0 (glibc-2.0.6)

Timing in hours.
In () is ratio between PPro and PII
In [] is ratio with the best time in the same column.

A. MbCO + 3830 waters (1000 steps)
---------------------------------------
   compiler           PentiumII/300MHz       PentiumPro/200MHz
   
   g77/egcs              2.20   [1.49]      3.99  (1.81)  [1.86]
   f2c/gcc-2.8.0         1.48   [1.00]      2.15  (1.45)  [1.00]
   f2c/gcc-2.7.3.2       1.58   [1.07]      2.29  (1.45)  [1.07]
   f77/Absoft-3.4a       2.32   [1.57]      4.49  (1.94)  [2.09]


B. MbCO + 4985 waters (100 steps) [PME]
---------------------------------------

   compiler           PentiumII/300MHz       PentiumPro/200MHz
   
   g77/egcs              0.421  [1.00]      0.629  (1.49) [1.00]
   f2c/gcc-2.8.0         0.476  [1.13]      0.672  (1.41) [1.07]
   f2c/gcc-2.7.3.2       0.460  [1.09]      0.683  (1.48) [1.09]
   f77/Absoft-3.4a       0.465  [1.10]      0.827  (1.78) [1.31]