Changes between Version 3 and Version 4 of 2020WP/ENHANCE-10_acc_fix_traqsr

Timestamp:

2020-05-13T22:55:02+02:00 (4 years ago)

Author:

acc

Comment:

--

2020WP/ENHANCE-10_acc_fix_traqsr

@@ -220 +220 @@
 
 === Performance and evaluation
-Both these options produce identical results to the original code (based on an ORCA2_ICE_PISCES test using SETTE (which includes variable surface chlorophyll inputs. ln_timing was activated and the 
+Both these options produce identical results to the original code (based on an ORCA2_ICE_PISCES test using SETTE (which includes variable surface chlorophyll inputs). ln_timing was activated and the CPU time (averaged across all processors) spent in tra_qsr used as a simple measure of performance. Unfortunately, variations in runtime between successive tests (even with the same code) on the NOC cluster were almost as great as any difference arising from algorithmic differences. Each test was repeated 6 times with the following results:
+
+|| code option    || 
+|| original code  ||  0.34      ||  0.34        ||  0.35        ||  0.35        ||  0.34        ||  0.34  ||    
+||  minimum memory option ||  0.36      ||  0.36        ||  0.37        ||  0.36        ||  0.36        ||  0.37  || 
+|| low memory option ||  0.35   ||  0.35        ||  0.35        ||  0.36        ||  0.36        ||  0.35  ||
+
+from which the tentative conclusion is that the minimum memory option does perform consistently worst but the low memory option appears to be a suitable replacement to the original code. More stringent tests are require to confirm this.
+
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