[GRASS-dev] Re: comparing r.cost and r.terracost [was: Re: [GRASS-user] affecting cat of closest feature as pixel value]

[Laura Toma]

This may be because you don't have rights to /var/tmp, or maybe the  
directory /var/tmp/mlenert does not exist.
To change this location,  you do not need to change main.cc. Instead   
use option

    VTMPDIR   Location of intermediate STREAMs
                    default: /var/tmp/username

I tried r.terracost .......VTMPDIR=.

and it put the  intermediate streams in the current folder.


The other potential problem is the location of the temporary streams.   
The default is /var/tmp/, but the user can set it with option
       STREAM_DIR   Location of temporary STREAMs
                    default: /var/tmp

Even though main.cc explicitly executes a setenv,   it did not work  
for me. I had to explicitly run from the shell:
export STREAM_DIR=/var/tmp/



-Laura


On Jul 15, 2009, at 12:49 PM, Moritz Lennert wrote:

> On 15/07/09 15:40, Laura Toma wrote:
>> Hi Moritz,
>> Terracost  runs in two modes:  in memory (when numtiles=1), and in  
>> external memory, using streams (when numtiles>1).   When run  
>> without a value for numtiles, it sets numtiles  to the optimal  
>> value. In all your tests numtiles was set to 1.   The algorithms in  
>> the 2 cases are different, so you also need to test with numtiles>1.
>
> Trying to run with numtiles>1, I get:
>
> TileFactory: Sorting internalstr...
> file=/var/tmp/mlennert/terracost.tileStr:cannot read!: Bad address
> r.terracost: /home/mlennert/SRC/GRASS/grass64_release/dist.i486-pc- 
> linux-gnu/include/grass/iostream/ami_sort_impl.h:91: size_t  
> makeRun_Block(AMI_STREAM<T>*, T*, unsigned int, Compare*) [with T =  
> ijCostType<costSourceType>, Compare = ijTileCostCompareType]:  
> Assertion `err == AMI_ERROR_NO_ERROR || err ==  
> AMI_ERROR_END_OF_STREAM' failed.
> Aborted
>
> And the same, if I change all occurrences of /var/tmp in main.cc to / 
> tmp
>
> Moritz
>
>
>