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| author | Eugeniy Mikhailov <evgmik@gmail.com> | 2011-08-23 13:05:52 -0400 |
|---|---|---|
| committer | Eugeniy Mikhailov <evgmik@gmail.com> | 2011-08-23 13:05:52 -0400 |
| commit | 9214d37cb22ac28fc64c152dd6b222481dbcb351 (patch) | |
| tree | 92257ba555fbb05044060c543ec920cad3fac89e /fortran/navy_four_levels | |
| parent | 9d93adcbc78004e9b24b35b08c26c00ea5b7d2af (diff) | |
| download | Nresonances-9214d37cb22ac28fc64c152dd6b222481dbcb351.tar.gz Nresonances-9214d37cb22ac28fc64c152dd6b222481dbcb351.zip | |
Added note about time execution estimate
Diffstat (limited to 'fortran/navy_four_levels')
| -rw-r--r-- | fortran/navy_four_levels/README | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/fortran/navy_four_levels/README b/fortran/navy_four_levels/README index 42c7e18..0f30a3a 100644 --- a/fortran/navy_four_levels/README +++ b/fortran/navy_four_levels/README @@ -1,4 +1,20 @@ -* Eugeniy is grumpy on 07/10/2007: +* Eugeniy is grumpy on 2011/07/10: Gosh, this is July 2011 and we are modifying Fortran 77 version to be Fortran 95. Is there a sense? + +* Eugeniy on 2011/08/23: +Navy chose very bad algorithm. +It seems to be a good idea to put normilezed dt=dz to avoid some unnesesary calculations +on each step. But results are devastating since code counter intuitively runs longer for +a shorter cell, and not surprisingly proportionally to time interval. + +Execution time proportional to the total number of grid nodes which can be calculated as + +Ngrid = tptz*zpts = (tmax-tmin)*Gamma_super / ((zmax*Gamma_super/(c*zpts)) *zpts + +Ngrid = (tmax-tmin)*c/zmax * zpts^2 + +where 'c' is speed of light, 'zmax' is length of the cell, and 'zpts' is number +of desired points along z axis. + |