Changes between Version 10 and Version 11 of Documentation/UserGuide/FLUXNETValidation

Timestamp:

2019-08-08T09:51:12+02:00 (5 years ago)

Author:

mmcgrath

Comment:

Adding some timing data

Documentation/UserGuide/FLUXNETValidation

@@ -168 +168 @@
 BE SURE TO CHECK THE USED RUN.DEFs.  These can be found by changing to the RUN_DIR when the job is running.  The scripts will add flags to the end of the run.def, and sometimes these may conflict with what you want to run.
 
+== Speed ==
+Some timing tests were carried out with TAG2.1, TRUNK (r6096), and CAN (r6091) on obelix.  This revealed the importance of the NBUFF=0 keyword for running with FLUXNET data for a single site.  When running for a single site with forcing that has lower temporal resolution (e.g., CRUNCEP, which has six-hourly resolution instead of the 30 min resolution of FLUXNET), it's much less important.  The amount of data output for all runs was adjusted to give approximately the same size of files.  The optimized executables were used for all tests (-O3).
+
+I take timings from four locations: ``CPU Time Global'' and ``Real Time Global'' from out\_orchidee, and then the real and user times reported by ``time -p ./orhcidee\_ol''.  For the most part, they are similar.  For clairity, I only report ``Real time Global'' from out\_orchidee below.  Error bars are the standard deviation from 5 independent runs to show the variance.
+
+The TRUNK and TAG21 have 15 PFTs, CAN has 28 PFTs, but they are all set to zero except for NeedleleafEvergreenTemperate (PFT4...4), Deciduous temperate (PFT6...8), C3Grass (PFT10..23), and C3Crop (PFT12...26), which are all set to 0.25.  I wanted to simulate a somewhat realistic pixel with a mix of vegetation.
+
+'''Using NBUFF=1'''
+
+FLUXNET forcing, XIOS, half-hour sechiba history, one day stomate history, 5 years, no libIGCM, the total time is [in seconds, with standard deviation from five runs on obelix]
+
+{{{
+TAG21       1270 $\pm$ 60
+TRUNK       4600 $\pm$ 600
+CAN         5800 $\pm$ 500
+}}}
+ 
+
+CRUNCEP forcing, XIOS, half-hour sechiba history, one day stomate history, 5 years, no libIGCM
+
+{{{
+TAG21       1310 $\pm$ 70
+TRUNK       1700 $\pm$ 100
+CAN         1810 $\pm$ 90
+}}}
+
+'''Using NBUFF=0'''
+
+FLUXNET forcing, XIOS, half-hour sechiba history, one day stomate history, 5 years, no libIGCM, the total time is [in seconds, with standard deviation from five runs on obelix]
+
+{{{
+TAG21       1250 $\pm$ 140
+TRUNK       1480 $\pm$ 90
+CAN         1700 $\pm$ 200
+}}}
+ 
+CRUNCEP forcing, XIOS, half-hour sechiba history, one day stomate history, 5 years, no libIGCM
+{{{
+TAG21       1310 $\pm$ 50
+TRUNK       1440 $\pm$ 110
+CAN         1700 $\pm$ 200
+}}}
+