Hello, I am trying to include OpenMP coding into raster processing so that each row can be processed by a different process.
The problem faced is that while row number 1 and 2 are still processing, row number 3 may already have an ouput for wirting in the output file. Therefore we would need to specify the row number to write the ouput row to. Right now, int G_put_raster_row (int fd, const void * buf, RASTER_MAP_TYPE data_type) does not include row number specification. So I tried to find other functions in put_row.c: int G_put_map_row_random (int fd, const CELL * buf, int row, int col, int n) This function is giving control to the data (row,col) location. However it writes only CELL type of data, which is limiting a lot what is possible to do with it in remote sensing processing. Ideally, what we would be looking for is a G_put_raster_random_row() function, giving only the row input location would be fine actually, since distributed row processing is faster than pixel-wise. I dont know what are the plans or interests to produce raster code that goes this way, but this is something simple I believe would help OpenMP coding. If people dont want to do it, I could try doing it. If I missed a major concept, please do not hesitate to correct me :-) Yann _______________________________________________ grass-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-dev
