[Omp] OpenMP and Intel compiler

[Shah, Sanjiv]

Hello,

This is indeed strange, but I am not sure I fully understand the
situation.
Could you please clarify whether both the Hybrid MPI/OpenMP program and
the
pure MPI program were compiled with debug mode, or only one of them.

It would be clearest if you included a table as follows:

Code		Time
-------------------
Hybrid -g	xx 
MPI -g	xx * 2
Hybrid	yy
MPI		yy / 3

Is this what you data indicates?  What is the relationship of xx and yy?

Thanks,
Sanjiv

-----Original Message-----
From: Omp-bounces at openmp.org [mailto:Omp-bounces at openmp.org] On Behalf
Of Laksono Adhianto
Sent: Wednesday, December 17, 2003 10:12 PM
To: omp at openmp.org
Subject: [Omp] OpenMP and Intel compiler


Hi

I use Intel compiler v7.1 to compile a hybrid MPI/OpenMP and a pure MPI
program on Linux Intel Itanium2 clusters.

I found out that if the program is compiled in debugging mode (with -g
option), then the hybrid MPI/OpenMP is twice faster than pure MPI.
However, if compiled without debugging mode, then pure MPI is three
times faster then hybrid MPI/OpenMP.

I also tried with SWEEP3D benchmark, and the result is approximately the
same (i.e. with debugging mode hybrid MPI/OpenMP is much faster than
pure MPI).

Is this normal or it's just my 'luck' ?
Well, "intuitively" either with or without debugging mode, the result
should be the same ?

Regards,

------
Laksono Adhianto



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