The ABINIT Users Mailing List ( CLOSED )

[<michel.cote@umontreal.ca>]

Hello Mike, and all,

Since you seem to be from Intel, I have a question concerning the Fortran 
compiler version 7.0. I posted a message concerning this problem sometime 
before Christmas. Here what it said:

-----------
I spent quite a lot of time to find out a way to compiler with the new Intel 
compiler. Here's what I found work best:

Compile everything with option except files in directories: drive, iovars and 
psp

-03 -xW -tpp7

For the files in directories drive, iovars and psp, use option:

-00 -xW -tpp7

It worked for me and I got the same speed as with version 6 of the Intel 
compiler.

Michel
-------------

Were you able to compile abinit and run the tests with the option you 
mentioned?

Michel 

> -----Message d'origine-----
> De : Haverty, Michael G [mailto:michael.g.haverty@intel.com]
> Envoyé : 6 janvier, 2003 12:45
> À : forum@abinit.org
> Objet : RE: [abinit-forum] performance optimization on Linux cluster
> 
> 
> Hi Linhui,
>   The optimization options used for the Xeon and Pentium IV processors
> should be the same.
>   The same optimization options ("-tpp6 -axK" for Pentium III & "-tpp7
> -axW" for Pentium 4's") can be used for both the Intel C 
> Compiler (icc)
> and the Intel Fortran Compiler (ifc).
>                                       Mike
> 
> -----Original Message-----
> From: fdsa fda [mailto:yelinhui1@yahoo.com] 
> Sent: Tuesday, December 31, 2002 8:30 PM
> To: forum@abinit.org
> Subject: RE: [abinit-forum] performance optimization on Linux cluster
> 
> Dear Mike,
> 
> Sorry I forget to ask you what shall be the
> optimization options for Xeon processor?
> 
> By the way, what shall be the optimization options for
> icc compiler, for both PIII and Xeon processors?
> 
> Thank you,
> 
> Linhui
> 
> 
> --- "Haverty, Michael G" <michael.g.haverty@intel.com>
> wrote:
> > Hello Linhui and all,
> >     Some of the compiler optimization options that you
> > are using are
> > for the pgf90 compiler.  To use the Intel Fortran
> > Compiler's processor
> > specific optimizations for Intel Pentium III's you
> > need to use the flags
> > "-tpp6 -axK" to replace the "-tp p6" in your FFLAGS
> > line.  For Intel
> > Pentium 4's the flags would be "-tpp7 -axW"
> >                             Mike
> > 
> > 
> > -----Original Message-----
> > From: fdsa fda [mailto:yelinhui1@yahoo.com] 
> > Sent: Monday, December 30, 2002 8:15 PM
> > To: forum@abinit.org
> > Subject: [abinit-forum] performance optimization on
> > Linux cluster
> > 
> > Dear Gonze, dear all,
> > 
> > I'm compiling abinit on a PIII Linux cluster
> > connected
> > by 100Mbit Ethernet. The binaries are produced with
> > little trouble. After some trivial tests I start a
> > real complex job, which contains 40 atoms in the
> > unit
> > cell. I found the performance is not much satisfied.
> > 
> > 
> > Now I'm considering recompilation by more
> > optimization.
> > 
> > I use Intel Fortran Compiler(ifc, unfortunately it
> > has
> > the same name as the ifc utility of abinit, which
> > causes me a little trouble), and MKL math library
> > with
> > it.
> > 
> > For all source files I use compiler options
> > 
> > FFLAGS="-O3 -w -mp -tp p6 -unroll 3"
> > 
> > For linking I substitute the appended blas and
> > lapack
> > with MKL:
> > 
> > LIBS=-L/usr/local/lib -lguide -lmkl_def -lmkl_lapack
> > -lmkl_p3
> > 
> > OK. The binary(abinip) is smoothly generated.
> > 
> > I'm still testing the new binary. To my expectation
> > it
> > should be faster than the default one. But, does
> > anyone know whether there are still other measures
> > to
> > gain more optimization in compilatioin?
> > 
> > Another problem, how to gain maximum parallel
> > efficience during job run? Suppose I use 8 special
> > k-points in Brillouin zone integration, is it
> > meaningful to use more than 8 nodes in parallel job?
> > 
> > Regards,
> > 
> > 
> > 
> > Linhui
> > 
> > 
> > 
> > 
> > 
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