Text archives Help

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Abe

Many thanks for your replies to my previous queries which have greatly helped us
in our testing.

I have a few more questions concerning specific compiler optimizations to use.

Manta appears to be preconfigured (via cmake) to use only -03 with icc.
Why doesn't it also use -mcpu=itanium2 and -fast ?
The -g option is included in the release builds. Why is this ?

There are 2 SSE options visible in cmake (MANTA_SSE and MANTA_SSE_GCC)
which were preconfigured as follows:

                 gcc    icc
MANTA_SSE         OFF    ON
MANTA_SSE_GCC     OFF    OFF

For CC=icc, MANTA_SSE=ON by default

However, Manta fails to compile with error "Internal Error:Backend Signals" so
we had to turn it off. Should it be on by default ?

For CC=gcc, MANTA SSE_GCC=OFF by default

To use SSE I assume we just need to modify the above cmake options and add any
required flags to CMAKE_CXX_FLAGS (i.e. -msse and -msse2). Is this correct ?

Thanks again for your help.

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Shree Pavar
Centre for Computational Science, UCL
http://www.chem.ucl.ac.uk/ccs/

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• [MANTA] Rendering to buffer for benchmarking Manta, Shreekanth Pavar, 02/27/2007
  • Re: [MANTA] Rendering to buffer for benchmarking Manta, Abe Stephens, 02/27/2007
    • Re: [MANTA] Compiler flags to use with gcc and icc, Shreekanth Pavar, 02/28/2007
      • Re: [MANTA] Compiler flags to use with gcc and icc, Abe Stephens, 02/28/2007

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