[RegCNET] floating point problem

[M.Sudhanshu Shekhar]

Dear Dr. Bi and all regcm users.

 

I am running the latest version (mar 09) of regcm for 6 months (Jan 2000 to june 2000) and having a problem. I have Linux x86-64 machine with pgi compiler. The run stops on 11th Feb giving only "floating exception". When I reduce the time steps, again it stops after few days run. Also having some problem in parallel run (though I have selected 3 processors, regcm.x works on only one processor).

 

Kindly suggest. I am sending domain.param for your information.

 

Thanking you

Shekhar



#################################
Dr. M. S. Shekhar
Scientist 'C', DRDO
Snow & Avalanche Study Establishment
R & D Centre, Him Parisar
Sector 37A, Chandigarh
#################################
 


 

> Date: Mon, 27 Apr 2009 17:41:27 +0200
> From: bixq at ictp.it
> To: congc84 at 163.com
> CC: regcnet at lists.ictp.it
> Subject: Re: [RegCNET] In parallel run, how to control the GRID
> 
> 
> Well, you need consider the order of CPU.
> 
> 1. make sure the following line is in the subroutine you want to apply
> include 'mpiregcm.h'
> 
> 2. then calculate
> jj = j+myid*jxp ! j is the parallel j number
> ! myid is the sequence of CPU
> ! jxp is mjx/NCPU
> 
> 3. add your codes besed on jj.
> 
> 4. You'd better have a check to make sure you can get exactly the same
> result between serial and parallel run.
> 
> Regards,
> 
> On Mon, 27 Apr 2009, congc84 wrote:
> 
> >
> >
> > Dear all;
> > When the RegCM is running in parallel way, the domain is divided according to the x grid number:
> > 1 2 3 4 +++ 5 6 7 8 +++ 9 10 11 12
> > If I want to change a variable (for example heart) based on 3456, I could use if(i>3&i<6) in serial run.
> > But in parallel run, they are cut into 3 blocks, and their subscripts are all 1-4. So I want to ask help on how I can only modify 3 4 5 6 grid value in parallel way. (the 4 grid belong two different blocks)
> > May be controling the CPU number is a feasible way, but I don't familiar with MPI so much.
> 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Dr. Xunqiang Bi email:bixq at ictp.it
> Earth System Physics Group
> The Abdus Salam ICTP
> Strada Costiera, 11
> P.O. BOX 586, 34100 Trieste, ITALY
> Tel: +39-040-2240302 Fax: +39-040-2240449
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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