f77 performance

[mikem at uwstat.UUCP]

> 
> 	 A user on our VAX-11/780 are running performance-tests on
> 	 different machines. The program is aprox. 7000 lines of
> 	 FORTRAN. The performance on the 780 is only 0.75 of a 750
> 	 running VMS. The comparison was done between computer-bound
> 	 parts of the program. When it comes to I/O it's even worse.

I don't know about the i-o, but compute times could easily be like this
if one machine had a Floating Point Unit and the other did not.  My
limited timings indicate that with FPA units, a 750 and 780 are about
equivalent on floating point intensive code.

-- 

Mike Meyer --  Phone (608) 262-1157

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