Annotation of /MITgcm/verification/natl_box/results/output.txt

Revision 1.16 - (hide annotations) (download)
Fri Feb 6 20:21:06 2004 UTC (20 years, 2 months ago) by adcroft
Branch: MAIN
CVS Tags: checkpoint52l_pre, checkpoint52j_pre, checkpoint52k_post, checkpoint53, checkpoint52m_post, checkpoint53c_post, checkpoint53a_post, checkpoint52j_post, checkpoint52l_post, checkpoint52n_post, checkpoint53b_pre, checkpoint53b_post, checkpoint53d_pre
Changes since 1.15: +362 -470 lines
File MIME type: text/plain

Changed the order of operations for global sums of arrays.
 o this *DOES* change output
   - the following results are updated by this change:
        exp4 front_relax global_ocean.cs32x15 global_ocean_pressure
        ideal_2D_oce internal_wave natl_box plume_on_slope
   - changes are primarily due to different cg2d residuals but in some
     the Eta field changes and this changes other fields
 o the global sum used to accumulate sequentially over all tiles on a single
   process and then the result be passed to _GLOBAL_SUM()
 o now we create a sum per tile and accumulate the sums
   - this should fix differences in sum for two tiles on 1 or 2 processors
   - this may help when using more than2 tiles but is not guaranteed
   - introducing a gather operation in GLOBAL_SUM() will fix differences
     for multiple tiles but only for fixed tiles configurations
   - an array based sum function is needed to make this independent of
     tile configuration