The ABINIT Users Mailing List ( CLOSED )

[delaire@caltech.edu]

Hello,

As a follow-up... I did manage to compile 4.6.5 with g95 on opterons running 
Debian, both in serial and parallel (with mpich2, also compiled with g95),
and the performance I am now getting looks (at first sight) comparable to the 
distributed pgi/ifc/g95 binaries. 
I basically re-used the makefile_macros file for P6 architecture ('sleepy') 
and it works fine for the opterons.
Something to note: the -O3 flag gives good results with g95, but some other 
flags, such as sse2/sse3, -m64 (for 64 bit) do not give any speedup... maybe 
those aren't really implemented in g95 yet (?).
And one more thing: be careful (as always) to compile various libraries (such 
as mpich) with the same options as abinit as far as appending underscores to 
function names (ie: if you didn't use -fno-second-underscore to compile 
mpich, don't use it to compile abinit... it got me the first time).

Thanks Xavier, Pierre-Matthieu and Paul for the feedback!
Regards,
Olivier Delaire.