Hi, I've just commited in trunk the capability of doing multi-threaded warping. There was already a -multi option of gdalwarp that was used to parallelize I/O operations and warping computations. There's now a NUM_THREADS warping option that can be used to set the number of threads to parallelize the warping computations themselves. The value can be either a numeric value or ALL_CPUS to use all the available CPUs/cores. The best performance is achieved when used in combination with PROJ 4.8.0 or later, which allow SRS transformations to be done in parallel (when an older version is used, GDAL uses a global mutex to serialize SRS transformations). The new option is of course mostly useful when warping is CPU bound, for example when using complex warping kernels, such as cubic or lanczos.
For example : gdalwarp [-multi] src.tif dst.tif -wo NUM_THREADS=ALL_CPUS Please test and report if you have issues. Best regards, Even _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
