From: shayan_at_msu.edu
Date: Wed Apr 08 2009 - 10:09:11 CDT
Thanks Axel for your reply.
I have build using the 2.6 source, which, I beleive, is the same as the executable available on Ranger.
I need to compile NAMD myself since I have a code customized according to my need.
I have also compared the timing with the linux-amd64 binary available from NAMD home. The timing for 16cpus (1 node) are as follows:
16 CPU: 0.2533 s/step 1.4659 days/ns (executable from ~tg455591 on Ranger)
16 CPU: 0.9072 s/step 5.2504 days/ns (NAMD_2.6_Linux-amd64 binary from NAMD home)
16 CPU: 0.9850 s/step 5.7000 days/ns (my compiled version)
Using the right options might help me to get a better executable atleast close to the one in Ranger.
Thanks,
Shayantani
Quoting "Axel Kohlmeyer" <akohlmey_at_cmm.chem.upenn.edu>:
> On Wed, 2009-04-08 at 08:33 -0400, shayan_at_msu.edu wrote:
>> Hello NAMD users,
>> I need to have a NAMD executable that can run on 16cpus of 1 node on
>> Ranger without using the MPI environment. Can anyone tell me about the
>> optimal build options for Ranger?
>> I have tried to compile using the following options:
>> build charm++ net-linux-amd64 -O -DCMK_OPTIMIZE=1
>> config tcl fftw Linux-amd64-g++
>> I have used the fftw-linux-amd64 and tcl-linux-amd64 libraries from
>> the NAMD home.
>> But, the compiled version is several times slower than the executable
>> from the directory ~tg455591/Linux-amd64-MVAPICH-icc/namd2.
>> Any suggesstion that will help me to compile and get close to the
>> optimal timing would be greatly helpful.
>
> before getting in way over your head, did you try the precompiled
> amd64 version from the namd homepage? you should also make sure that
> you compare executables generated from the same sources, i.e. that you
> don't mix the recent beta release with the 2.6 version.
>
> axel.
>
>>
>> Thanking all,
>> Shayantani
>>
>> Shayantani Mukherjee
>> MSU.
>>
>
> --
> =======================================================================
> Axel Kohlmeyer akohlmey_at_cmm.chem.upenn.edu http://www.cmm.upenn.edu
> Center for Molecular Modeling -- University of Pennsylvania
> Department of Chemistry, 231 S.34th Street, Philadelphia, PA 19104-6323
> tel: 1-215-898-1582, fax: 1-215-573-6233, office-tel: 1-215-898-5425
> =======================================================================
> If you make something idiot-proof, the universe creates a better idiot.
>
>
>
Shayantani Mukherjee
Postdoctoral Research Associate
Dept. of Biochemistry and Molecular Biology
Michigan State University
E-mail: shayan_at_msu.edu
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