Make number of Opensfm processes configurable (#452)

* Update README.md (#2)

Proposed changes for #431

* Added support for setting number of processes for opensfm.

opendm/config.py

@@ -118,6 +118,13 @@ def config():
                              'images based on GPS exif data. Set to 0 to skip '
                              'pre-matching. Default: %(default)s')
 
+    parser.add_argument('--opensfm-processes',
+                        metavar='<positive integer>',
+                        default=context.num_cores,
+                        type=int,
+                        help=('The maximum number of processes to use in dense '
+                              'reconstruction. Default: %(default)s'))
+
     parser.add_argument('--use-opensfm-pointcloud',
                         action='store_true',
                         default=False,

scripts/odm_app.py

@@ -45,7 +45,7 @@ class ODMApp(ecto.BlackBox):
                  'opensfm': ODMOpenSfMCell(use_exif_size=False,
                                            feature_process_size=p.args.resize_to,
                                            feature_min_frames=p.args.min_num_features,
-                                           processes=context.num_cores,
+                                           processes=p.args.opensfm_processes,
                                            matching_gps_neighbors=p.args.matcher_neighbors,
                                            matching_gps_distance=p.args.matcher_distance),
                  'slam': ODMSlamCell(),