write variables to txt document

[w_xuej@163_com]

Dear all,      I want to write some variables to txt document.I add follow to uv3s_update.F90,But it runs very very slow.So what should I do?Thanks! open(nstep,file='/gpfsdata/shaoam/CASE/test01/run/U-A1-'//trim(fname_date)//'.out',form='formatted') open(nstep+1,file='/gpfsdata/shaoam/CASE/test01/run/V-A1-'//trim(fname_date)//'.out',form='formatted') if (mod(nstep,48)==0) then       write(nstep,*) im, jm, km       do k = 1, km          do j = 1, jm            do i = 1, im               write(nstep,*)   u3s(i,j,k)               write(nstep+1,*) v3s(i,j,k)            enddo          enddo       enddo       close(nstep)       close(nstep+1)    end if

 

[jedwards]

Write to netcdf using the provided mechanism.  There are output options that will do this. If you really insist on writing a text file get rid of the loops and write them in one step:write(nstep,*) u3s(1:im, 1:jm, 1:km)

 

[w_xuej@163_com]

Thanks for your reply.If I want to write netcdf ,what should I do to use the provided mechanism? Can you explain more detail for me?Thank you very much! 

 

[jedwards]

You don't need to modify any files, this is available via the namelistsin user_nl_cam addfincl2 = 'US:I','VS:I'nhtfrq = 0,  1 This will write the instantanious values of US and VS to the second cam history file at each step. See the documentation at http://www.cesm.ucar.edu/models/cesm1.2/cam/docs/ug5_3/ch04.html

 

[w_xuej@163_com]

Thanks for your reply.I need to change code,because I want to update this variables.So I write variables to netcdf files to test them.Can you tell me how to create a new netcdf file and write variables to it by changing code in uv3s_update? What modules I need to invoke?Thank you!

 

[hannay]

You can add new variables to the history files with the subroutines:addfld
and
outfldLook  for "Output an extra variable" at page 38 at
http://www.cesm.ucar.edu/events/tutorials/081114/practical4-hannay.pdf

 

[w_xuej@163_com]

Thanks for your reply.I use addfld and outfld to write five variables in h1 files, but it still runs slowly. So I change these variables in restart filses(test.cam.r.*) and restart every time .It runs faster than that .So I don't understand I only write out 5 variables to h1 files and writing out restart files need many variables ,but it runs more slowerly. Can you help me ? Thank you.

 

[jedwards]

There isn't any difference in the mechanism to write a history or a restart file. So I wouldn't expect the performance to be different.