scalability of r.terraflow
|Reported by:||dnewcomb||Owned by:|
|Keywords:||r.terraflow, large grids||Cc:|
Description (last modified by )
I have an fcell grid of elevations for the state of North Carolina (51000 rows 133000 columns 6783000000 cells) . I tried to run r.terraflow in GRASS7 ( 8/8/2011 svn snapshot) and ran into the dimension limits. So I patched them according to Glynn's email , http://www.osgeo.org/pipermail/grass-user/2004-February/024722.html and tried again ( Would it be better to change the dimension variable to int instead of short int?) .
This time my Streams file builds to about 26 GB and then r.terraflow bombs with :
MFD flow direction D8CUT=999999986991104.000000 Memory size: 808.00M (847249408) bytes Memory manager registering memory in MM_IGNORE_MEMORY_EXCEEDED mode. r.terraflow: grass2str.h:145: AMI_STREAM<T>* cell2stream(char*, elevation_type, long int*) [with T = float, elevation_type = float]: Assertion `nrows * ncols == str->stream_len()' failed.
The memory size is interesting, because I'm giving it 8GB of RAM out of 16 GB in the command. The temp directory has about 900GB of space, so it has plenty of room .
The box is 64 bit Ubuntu 11.04 related to ?
Change History (26)
comment:2 by , 9 years ago
|Component:||Default → Raster|
|Keywords:||r.terraflow large grids → r.terraflow, large grids|
follow-up: 19 comment:18 by , 4 years ago
|Milestone:||7.0.0 → 7.8.0|
|Status:||closed → reopened|
|Version:||svn-develbranch6 → svn-trunk|