diff --git a/.gitignore b/.gitignore
index c80f325..199b770 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,5 @@ callgrind.out
 programs/cube.asm
 programs/utah_teapot.asm
 auxiliary_progs/stl_to_source_code
+
+simlog.json
diff --git a/cpu.c b/cpu.c
index f1b0117..f8e03d9 100644
--- a/cpu.c
+++ b/cpu.c
@@ -581,6 +581,7 @@ int exec(struct simdata_t *simdata){
 	if(simdata->exec_data->cycles_left==0){
 		simdata->fetch_data->exec_done=1;
 		simdata->decode_data->exec_done=1;
+		simdata->finished_instructions++;
 	}
 	add_to_instr_list(&simdata->cpu_gui_hints->executing_list,simdata->exec_data->address);
 	return 0;
diff --git a/main.c b/main.c
index c386811..bbb0ae2 100644
--- a/main.c
+++ b/main.c
@@ -41,6 +41,7 @@ void help(char* progname){
 #else
 			"                            braille\n"
 #endif
+			"  -o < file >               Output simualtion data to specified json log file\n"
 			, progname);
 }
 
@@ -61,7 +62,9 @@ int main(int argc, char* argd[] ){
 	char *assemble = NULL;
 	enum FB_DRIVER_t fb_driver=FB_BRAILLE;
 	int opt;
-	while ((opt = getopt(argc, argd, "hi:a:r:")) != -1) {
+	char *json_log_filename=NULL;
+	FILE *JSON_LOG_FILE;
+	while ((opt = getopt(argc, argd, "hi:a:r:o:")) != -1) {
 		switch (opt) {
 			case 'h':
 				help(argd[0]);
@@ -88,6 +91,9 @@ int main(int argc, char* argd[] ){
 					return 1;
 				}
 				break;
+			case 'o':
+				json_log_filename=optarg;
+				break;
 			default:
 				help(argd[0]);
 				return 1;
@@ -104,6 +110,14 @@ int main(int argc, char* argd[] ){
 		help(argd[0]);
 		return 1;
 	}
+	if (json_log_filename){
+		JSON_LOG_FILE=fopen(json_log_filename,"w");
+		if(JSON_LOG_FILE==NULL){
+			printf("Error opening file \"%s\": %s\n",json_log_filename,strerror(errno));
+			return 1;
+		}
+		fprintf(JSON_LOG_FILE, "{\n\"end_of_simulation_data\" : {\n");
+	}
 
 	/// READ INPUT FILE ///
 	FILE* rom=fopen(infile,"r");
@@ -275,6 +289,14 @@ int main(int argc, char* argd[] ){
 				usleep(100000);
 		}
 
+		if(json_log_filename){
+			fprintf(JSON_LOG_FILE, "\"cycles_run_for\" : %lu ,\n", simdata->current_clock);
+			fprintf(JSON_LOG_FILE, "\"instructions_executed\" : %lu\n", simdata->finished_instructions);
+			fprintf(JSON_LOG_FILE, "}\n}\n" );
+
+			fclose(JSON_LOG_FILE);
+		}
+
 		if(end_gui()){
 			printf("Failed on end_gui()\n");
 			cpu_simdata_free(simdata);
diff --git a/parse_log.sh b/parse_log.sh
new file mode 100755
index 0000000..0501d6a
--- /dev/null
+++ b/parse_log.sh
@@ -0,0 +1,13 @@
+#!/bin/sh
+set -eu
+
+if ! [ "$#" = 1 ]
+then
+	echo $0 \<simlog json file\>
+	exit 1
+fi
+
+CYCLES=$(cat "$1" | json2tsv | sed -n '/^\.end_of_simulation_data\.cycles_run_for\t/s/\.end_of_simulation_data\.cycles_run_for\tn\t//p' )
+INSTRUCTIONS=$(cat "$1" | json2tsv | sed -n '/^\.end_of_simulation_data\.instructions_executed\t/s/\.end_of_simulation_data\.instructions_executed\tn\t//p' )
+
+echo executed $INSTRUCTIONS instructions with an IPC=$(echo "$INSTRUCTIONS/$CYCLES" | bc -l|grep -o '^.*\...')
diff --git a/simdata.c b/simdata.c
index 2a22314..b964e81 100644
--- a/simdata.c
+++ b/simdata.c
@@ -25,10 +25,11 @@
 struct simdata_t *init_simdata(){
 	struct simdata_t * ret=malloc(sizeof(struct simdata_t));
 
-	if(!ret){
-		ret->current_clock=0;
+	if(!ret)
 		return 0;
-	}
+
+	ret->current_clock=0;
+	ret->finished_instructions=0;
 
 	ret->RAM=malloc(16777216); //Maximum addressable memory
 	if(!ret->RAM){
diff --git a/simdata.h b/simdata.h
index de35061..d5e65c5 100644
--- a/simdata.h
+++ b/simdata.h
@@ -13,6 +13,7 @@ enum CPU_STRUCTURE_t{ //TODO: I would prefer this would go to cpu.h
 
 struct simdata_t{
 	long unsigned int current_clock;
+	long unsigned int finished_instructions;
 	uint8_t *RAM;
 
 	struct fetch_data_t *fetch_data;