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CERN openlab II - Platform
CC - Optimization
Benchmarking
Benchmarking, or measuring the performance, has always been
the best way to describe the capabilities of a certain CPU
or computer. The main challenge however, is to find a
benchmark which reflects the actual workload reasonably
well. Up to now the workload generated by the CERN/HEP
experiments was scaling quite well with the performance
measured with the SPECint2000 benchmark. But already with
SPEC certain difficulties appear. Depending on the compiler
and the compiler options the results differ significantly.
In order to obtain useful results CERN uses a specific
configuration for running the
SPEC2000 benchmark.
The benchmarks are compiled with
gcc and the options "-O2
-fPIC -pthread".
-
-O2 - standard optimization
flag
-
-fPIC - produces "Position
Independent Code", used mainly for shared libraries
-
-pthread - try to use POSIX
threads
The benchmarking project inside openlab has several
purposes:
-
better understanding of
CERN workload (in connection with the performance
monitoring project)
-
evaluating the new
SPEC2006
benchmark
-
look at possible
correlations with CERN/HEP workload
-
possible replacement of
SPECint2000
as standard benchmark
-
test and evaluate
pre-production systems provided by Intel
For more information on
the frameworks for LHC experiments and the compiler project,
see the website
edited by
Jose Dana. A benchmark
repository, edited by
Havard Bjerke is also available to you.
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