Subject: BENCHMARKS FOR G94W ON PENTIUMPRO

From: "E. Lewars" <[email-masked]>
Date: Tue, 3 Feb 1998 11:36:14 -0500 (EST)

Tuesday 1998 Feb 3
SOME BENCHMARKS FOR G94 ON A PENTIUM PRO

Hello,

Here is a comparison of cpu times for G94 jobs on the Dec AlphaServer
(presumably with UNIX) and the Pentium Pro with Windows NT 4.0.

The DEC times were reported in the Gaussian Inc. book "Exploring Chemistry
with Electronic Structure Methods", 2nd ed., by J. B. Foresman and A. Frisch,
1996 [a guide to Gaussian 94]; they are for a DEC AlphaServer with 5 GB disk
and 250 MB RAM.  The Pentium times are for a PentiumPro with 2 GB scratch space
alloted to gaussian and 128 MB RAM, running G94W v. 4.2 (the DEC version is
presumably UNIX G94 for a couple years earlier).

   The designations 2_05a etc are those used in "Exploring Chemistry..."

Short jobs (< 20 min on DEC) | Medium jobs (0.3 h--<2h on DEC)
 job     Time, min           | job        Time, h
        DEC   Pentium  Ratio |        DEC   Pentium  Ratio
2_05a    3.0    8.0     2.7  |2_06    0.74   1.5    2.0
2_05b    2.8    6.7     2.4  |3_05a   1.0    3.2    3.2
2_05c    2.8    3.5     1.3  |3_05b   1.8    4.4    2.4
4_04d    7.3    6.8     0.9  |e4_02d  0.34   0.57   1.7
4_04e    6.0   10.2     1.7  |4_05a   0.92   1.9    2.1
4_04f   17.6   47       2.7  |e5_02   0.71   1.4    2.0
e9_02    3.9    2.9     0.7  |5_02    1.2    2.5    2.1
                              5_03a   0.75   2.6    3.5
                              5_03b   1.2    3.7    3.1
                              e6_06   0.50   0.80   1.6
                              6_03x   0.90   2.5    2.8
                              6_04    0.58   1.5    2.6
                              6_06d   0.53   1.1    2.1
                              6_08    0.62   0.87   1.4
                              8_01c   0.70   1.3    1.9

Long jobs  (>=2 h on DEC)
 job     Time, h
        DEC   Pentium  Ratio
3_06b   11.2   36       3.2
4_05b    2.0    4.7     2.4
5_04     3.4   10.5     3.1
e6_04    3.6    9.2     2.6
6_03     5.8   18.0     3.1
6_07b    2.0    7.3     3.7
10_04c   4.5   11.7     2.6
10_05a   4.1   12.4     3.0
10_05b   4.0   12.5     3.1
-------------------------------------------------------
  It's said that (1) the PentiumPro may be faster than the Pentium II for
number crucnching (see CCL archives for recent discussion) and (2) Linux is
faster than Windows NT (which in turn is better than W 95 for this kind
of work) but is not an operating system for "the faint of heart" (quoting
one contributor to the Net).

   [Does anyone know how much a DEC AlphaServer costs, and how it compares with,
say, the popular SGI Indy or O2 in speed?]

     E. Lewars         [email-masked]
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