[GRASS-dev] [GRASS GIS] #1421: scalability of r.terraflow

[GRASS GIS]

#1421: scalability of r.terraflow
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 Reporter:  dnewcomb                  |       Owner:  grass-dev@…              
     Type:  enhancement               |      Status:  new                      
 Priority:  normal                    |   Milestone:  7.0.0                    
Component:  Raster                    |     Version:  svn-develbranch6         
 Keywords:  r.terraflow, large grids  |    Platform:  Linux                    
      Cpu:  x86-64                    |  
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Comment(by dnewcomb):

 r.terraflow has been running for 9 hours with the modifications.   posted
 in the diff files  on a grid 51000 rows and 133000 columns. It should take
 5 days or so to complete in this computer.

 The thing that confuses me at the moment is the FILL line below in the
 temp file  listing below. Why are there a large negative number of
 elements?

 total elements=6783000000, nodata elements=3291487486
 largest temporary files:
 FILL: 454.84G (488376000000) [-1806934592 elements, 72B each]
 FLOW: 312.17G (335185201344) [3491512514 elements, 96B each]
 Will need at least 909.67G (976752000000) space available in /data1

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Ticket URL: <https://trac.osgeo.org/grass/ticket/1421#comment:4>
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