diff --git a/tools/darkroom/darkcult.py b/tools/darkroom/darkcult.py
new file mode 100755
index 00000000..5948856d
--- /dev/null
+++ b/tools/darkroom/darkcult.py
@@ -0,0 +1,54 @@
+#!/usr/bin/env python
+
+import sys
+import os
+import subprocess
+import multiprocessing
+
+def compile(command):
+	sys.stdout.write(".")
+	sys.stdout.flush()
+	return subprocess.call(command, shell=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE)
+
+if __name__=="__main__":
+	argv = sys.argv
+	argc = len(argv)
+
+	src = argv[1]
+	stagedir = argv[2]
+	output = argv[3]
+	compiler = argv[4]
+	width = int(argv[5])
+	height = int(argv[6])
+	tile_width = int(argv[7])
+	tile_height = int(argv[8])
+	compile_options = argv[9]
+	darkcult_cpp = argv[10]
+	max_procs = int(argv[11])
+
+	commands = []
+	for y in range(0, height, tile_height):
+		for x in range(0, width, tile_width):
+			bin = "%s/%d/%d.out" % (stagedir, y, x)
+			out = "%s/%d/%d.ppm" % (stagedir, y, x)
+			command = "%s -o %s" \
+				" %s" \
+				" -DDARKROOM_SOURCE=\'\"%s\"\'" \
+				" -DDARKROOM_TOTAL_WIDTH=%d -DDARKROOM_TOTAL_HEIGHT=%d" \
+				" -DDARKROOM_TILE_WIDTH=%d -DDARKROOM_TILE_HEIGHT=%d" \
+				" -DDARKROOM_OFFSET_X=%d -DDARKROOM_OFFSET_Y=%d" \
+				" %s" \
+				" && %s > %s" \
+				% (compiler, bin,
+					compile_options,
+					src,
+					width, height,
+					tile_width, tile_height,
+					x, y,
+					darkcult_cpp,
+					bin, out
+				)
+			commands.append(command);
+
+	pool = multiprocessing.Pool(max_procs)
+	sys.exit(any(pool.map(compile, commands)))
diff --git a/tools/darkroom/darkcult.sh b/tools/darkroom/darkcult.sh
index 0dde1217..080adf07 100755
--- a/tools/darkroom/darkcult.sh
+++ b/tools/darkroom/darkcult.sh
@@ -21,10 +21,13 @@ declare -a user_macros
 user_macros=()
 declare -a include_paths
 include_paths=()
+max_procs=1
 force=0
 use_help=0
+darkcult_cpp=$(cd $(dirname $0); pwd)/darkcult.cpp
+darkcult_py=$(cd $(dirname $0); pwd)/darkcult.py
 
-args=`getopt -o s:S:o:C:w:h:W:H:D:I:f -l source:,stagedir:,output:,compiler:,width:,height:,tile-width:,tile-height:,define:,include:,force,help -- "$@"`
+args=`getopt -o s:S:o:C:w:h:W:H:D:I:P:f -l source:,stagedir:,output:,compiler:,width:,height:,tile-width:,tile-height:,define:,include:,max-procs:,force,help -- "$@"`
 if [ "$?" -ne 0 ]; then
 	echo >&2 "error: options parse error. See 'darkcult.sh --help'"
 	exit 1
@@ -42,6 +45,7 @@ while [ -n "$1" ]; do
 		-H|--tile-height) tile_height=$2; shift 2;;
 		-D|--define) user_macros=(${user_macros[@]} "$2"); shift 2;;
 		-I|--include) include_paths=(${include_paths[@]} "$2"); shift 2;;
+		-P|--max_procs) max_procs=$2; shift 2;;
 		-f|--force) force=1; shift;;
 		--help) use_help=1; shift;;
 		--) shift; break;;
@@ -80,6 +84,9 @@ if [ ${use_help} -ne 0 ]; then
 	echo ""
 	echo "  -I, --include=<dir>         Add system include path."
 	echo ""
+	echo "  -P, --max-procs=<value>     The maximum number of process use."
+	echo "                              Default; 1"
+	echo ""
 	echo "  -f, --force                 Allow overwrite of <stagedir>."
 	echo ""
 	echo "      --help                  This message."
@@ -101,6 +108,7 @@ fi
 if [ ${#include_paths[*]} -gt 0 ]; then
 	echo "  include-paths = (${include_paths[*]})"
 fi
+echo "  max-procs = ${max_procs}"
 echo "  force = ${force}"
 
 if [ ! -f "${src}" -a ! -f "$(cd $(dirname $0); pwd)/${src}" ]; then
@@ -127,48 +135,73 @@ for include_path in ${include_paths}; do
 	include_options="${include_options} -I${include_path}"
 done
 
+for ((y=0; y<height; y+=tile_height)); do
+	mkdir -p ${stagedir}/${y}/
+done
+
+compile_options=-std=c++11 ${define_options} ${include_options}
+
 echo "rendering:"
 start=${SECONDS}
 
-for ((y=0; y<height; y+=tile_height)); do
-	echo "  y = (${y}/${height})..."
-	y_start=${SECONDS}
+if [ ${max_procs} -eq 1 ]; then
+	for ((y=0; y<height; y+=tile_height)); do
+		echo "  y = (${y}/${height})..."
+		y_start=${SECONDS}
 
-	mkdir -p ${stagedir}/${y}/
-	echo -n "    x = "
-	for ((x=0; x<width; x+=tile_width)); do
-		echo -n "(${x}/${height})..."
-		binname=${y}/${x}.out
-		bin=${stagedir}/${binname}
-		${compiler} -o ${bin} -std=c++11 \
-			${define_options} ${include_options} \
-			-DDARKROOM_SOURCE="\"${src}\"" \
-			-DDARKROOM_TOTAL_WIDTH=${width} -DDARKROOM_TOTAL_HEIGHT=${height} \
-			-DDARKROOM_TILE_WIDTH=${tile_width} -DDARKROOM_TILE_HEIGHT=${tile_height} \
-			-DDARKROOM_OFFSET_X=${x} -DDARKROOM_OFFSET_Y=${y} \
-			$(cd $(dirname $0); pwd)/darkcult.cpp
-		if [ $? -ne 0 ]; then
-			echo ""
-			echo >&2 "error: compile(${binname}) failed."
-			exit 1
-		fi
-		${bin} > ${stagedir}/${y}/${x}.ppm
+		echo -n "    x = "
+		for ((x=0; x<width; x+=tile_width)); do
+			echo -n "(${x}/${height})..."
+			binname=${y}/${x}.out
+			bin=${stagedir}/${binname}
+			${compiler} -o ${bin} \
+				${compile_options} \
+				-DDARKROOM_SOURCE="\"${src}\"" \
+				-DDARKROOM_TOTAL_WIDTH=${width} -DDARKROOM_TOTAL_HEIGHT=${height} \
+				-DDARKROOM_TILE_WIDTH=${tile_width} -DDARKROOM_TILE_HEIGHT=${tile_height} \
+				-DDARKROOM_OFFSET_X=${x} -DDARKROOM_OFFSET_Y=${y} \
+				${darkcult_cpp}
+			if [ $? -ne 0 ]; then
+				echo ""
+				echo >&2 "error: compile(${binname}) failed."
+				exit 1
+			fi
+			${bin} > ${stagedir}/${y}/${x}.ppm
+		done
+		echo ""
+
+		let "y_elapsed=${SECONDS}-${y_start}"
+		echo "    elapsed = ${y_elapsed}s"
 	done
+else
+	echo "  processing in parallel mode."
+	echo -n "  "
+	python "${darkcult_py}" \
+		"${src}" "${stagedir}" "${output}" "${compiler}" \
+		"${width}" "${height}" \
+		"${tile_width}" "${tile_height}" \
+		"${compile_options}" "${darkcult_cpp}" \
+		"${max_procs}"
+	if [ $? -ne 0 ]; then
+		echo ""
+		echo >&2 "error: compile failed."
+		exit 1
+	fi
 	echo ""
+fi
 
+let "elapsed=${SECONDS}-${start}"
+echo "  elapsed(total) = ${elapsed}s"
+
+for ((y=0; y<height; y+=tile_height)); do
 	pushd ${stagedir}/${y}/ > /dev/null
 #	convert +append $(ls *.ppm | sort -n) ../${y}.ppm
 	pnmcat -lr $(ls *.ppm | sort -n) > ../${y}.ppm
 	popd > /dev/null
-
-	let "y_elapsed=${SECONDS}-${y_start}"
-	echo "    elapsed = ${y_elapsed}s"
 done
 pushd ${stagedir} > /dev/null
 #convert -append $(ls *.ppm | sort -n) ${output}
 pnmcat -tb $(ls *.ppm | sort -n) > ${output}
 popd > /dev/null
 
-let "elapsed=${SECONDS}-${start}"
-echo "  elapsed(total) = ${elapsed}s"
 echo "finished."