Thread support for commandline:

-t <threads>

It overrides the settings as saved in scenes. Only works for background
rendering, to force thread amounts to match the cpus in system.
For funny jokers: amount is clipped for MAXTHREADS :)

source/blender/render/extern/include/RE_pipeline.h

@@ -159,6 +159,9 @@ void RE_Database_Free (struct Render *re);
 /* project dbase again, when viewplane/perspective changed */
 void RE_DataBase_ApplyWindow(struct Render *re);
 
+/* override the scene setting for amount threads, commandline */
+void RE_set_max_threads(int threads);
+
 /* the main processor, assumes all was set OK! */
 void RE_TileProcessor(struct Render *re, int firsttile);
 

source/blender/render/intern/source/pipeline.c

@@ -114,6 +114,9 @@ static struct ListBase RenderList= {NULL, NULL};
 /* hardcopy of current render, used while rendering for speed */
 Render R;
 
+/* commandline thread override */
+static int commandline_threads= 0;
+
 /* ********* alloc and free ******** */
 
 
@@ -812,6 +815,9 @@ void RE_InitState(Render *re, RenderData *rd, int winx, int winy, rcti *disprect
 		re->result= MEM_callocN(sizeof(RenderResult), "new render result");
 		re->result->rectx= re->rectx;
 		re->result->recty= re->recty;
+		
+		if(commandline_threads>0 && commandline_threads<=BLENDER_MAX_THREADS)
+			re->r.threads= commandline_threads;
 	}
 }
 
@@ -2067,3 +2073,11 @@ void RE_ReadRenderResult(Scene *scene, Scene *scenode)
 	
 	read_render_result(re);
 }
+
+void RE_set_max_threads(int threads)
+{
+	if(threads>0 && threads<=BLENDER_MAX_THREADS)
+		commandline_threads= threads;
+	else
+		printf("Error, threads has to be in range 1-%d\n", BLENDER_MAX_THREADS);
+}

source/creator/creator.c

@@ -187,6 +187,7 @@ static void print_help(void)
 	printf ("    (formats that can be compiled into blender, not available on all systems)\n");
 	printf ("    \tHDR TIFF EXR MPEG AVICODEC QUICKTIME CINEON DPX\n");
 	printf ("    -x <bool>\tSet option to add the file extension to the end of the file.\n");
+	printf ("    -t <threads>\tUse amount of <threads> for rendering\n");
 	printf ("\nAnimation options:\n");
 	printf ("  -a <file(s)>\tPlayback <file(s)>\n");
 	printf ("    -p <sx> <sy>\tOpen with lower left corner at <sx>, <sy>\n");
@@ -353,7 +354,6 @@ int main(int argc, char **argv)
 			case 'h':			
 				print_help();
 				exit(0);
-			
 			case 'v':
 				print_version();
 				exit(0);
@@ -398,6 +398,7 @@ int main(int argc, char **argv)
 				case 'd':
 					G.f |= G_DEBUG;		/* std output printf's */ 
 					printf ("Blender V %d.%02d\n", G.version/100, G.version%100);
+					MEM_set_memory_debug();
 #ifdef NAN_BUILDINFO
 					printf("Build: %s %s %s %s\n", build_date, build_time, build_platform, build_type);
 
@@ -649,6 +650,12 @@ int main(int argc, char **argv)
 				}
 				break;
 				
+			case 't':
+				a++;
+				if(G.background) {
+					RE_set_max_threads(atoi(argv[a]));
+				}
+				break;
 			case 'x': /* extension */
 				a++;
 				if (a < argc) {