mpi application fails with vanilla 2.6 kernels, works with rhelkernels

[Dimitris Zilaskos]

        Hi all,

        I am trying to run WRF model (http://wrf-model.org) on a dual core 
dual cpu opteron system with intel c/fortran 9 , scientific linux (rhel compatible,
tried 3.0.4 ,3.0.5 , 4.2) and mpich 1.2.7p1. As long as I use the vendor supplied
kernels everything works fine.However , when I use kernels compiled on my own, I am
getting erratic behaviour: the model will either crash, or produce invalid results,
or complete successfully approximately once in 20 attemps. If I run it on one CPU
it completes successfully with all kernels.
        I have tried with 2.6.14.3, 2.6.15.6 and 2.6.9. Both show the same 
erratic behaviour. Kernels 2.6.9-22 and 2.6.9-34 as supplied by scientific 
linux 4.2 and 2.4.21-37.0.1 in 3.0.4 work fine. All kernels are smp enabled.
I am copying the .config of the vendor kernels, compiling mpt fusion scsi 
drivers in kernel and not as modules in some cases. The application runs 
exclusively on the opteron system.
	I have no idea how to deal with this situation. Any help is 
appreciated.

	Best regards,

--
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Dimitris Zilaskos

Department of Physics @ Aristotle University of Thessaloniki , Greece
PGP key : http://tassadar.physics.auth.gr/~dzila/pgp_public_key.asc
	  http://egnatia.ee.auth.gr/~dzila/pgp_public_key.asc
MD5sum  : de2bd8f73d545f0e4caf3096894ad83f  pgp_public_key.asc
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