The ABINIT Users Mailing List ( CLOSED )

["Haverty, Michael G" <michael.g.haverty@intel.com>]

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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