Re: Similar systems, different performance of fortran code

[Victor Munoz <vmunoz@macul.ciencias.uchile.cl>]

On Sat, Apr 23, 2005 at 02:40:57PM +0100, michael wrote:
> As I noted before, memory may be playing a role here. if various arrays
> do not fit in your L1 cache or your registers are being re-used lots
> then that will slow things down irrespective of how fast the flop rating
> of the chip. I believe you said the compilers had no optimization turned
> on but have you checked they're both producing code for the right
> hardware? And have you checked the changeLogs/bugReports etc to see
> what's changed between compiler versions
> 

Yes, no optimization used, but I haven't checked it's code for the right
hardware (I'm reaching unknown territory for me, how could I know such a
thing?) Haven't checked changeLogs yet, but searches in the mailing lists
for gcc and g77 have not found relevant threads. I don't find anything
useful in open/archived Debian bugs for gcc and g77. Haven't looked in the
upstream pages yet. 


Regards,
						Victor