diff --git a/tests/bench.c b/tests/bench.c
index c3ef66b..84344f0 100644
--- a/tests/bench.c
+++ b/tests/bench.c
@@ -9,8 +9,9 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <sys/time.h>
+#include <stdarg.h>     /* va_list, va_start, va_arg, va_end */
 
-long unixtime() {
+unsigned long unixtime() {
     struct timeval tp;
     long sec = 0L;
     if (gettimeofday((struct timeval *) &tp, (NUL)) == 0) {
@@ -35,7 +36,6 @@ double microtime() {
     return 0;
 }
 
-
 void bench_start(bench *b) {
     b->start = microtime();
 }
@@ -58,3 +58,30 @@ void bench_print_summary(bench *b) {
     printf("finished in %lf seconds\n", bench_duration(b) );
     printf("%.2f i/sec\n", bench_iteration_speed(b) );
 }
+
+void bench_append_csv(char *filename, int countOfB, ...) {
+    FILE *fp = fopen(filename, "a+");
+    if(!fp) {
+        return;
+    }
+
+    unsigned long ts = unixtime();
+    fprintf(fp, "%ld", ts);
+
+
+    int i;
+    bench * b;
+    va_list vl;
+    va_start(vl,countOfB);
+    for (i=0 ; i < countOfB ; i++) {
+        b = va_arg(vl, bench*);
+        fprintf(fp, ",%.2f", bench_iteration_speed(b) );
+    }
+    va_end(vl);
+
+    fprintf(fp, "\n");
+    fclose(fp);
+}
+
+
+
diff --git a/tests/bench.h b/tests/bench.h
index 0d4c898..dbae90b 100644
--- a/tests/bench.h
+++ b/tests/bench.h
@@ -23,7 +23,7 @@ typedef struct {
     double end;
 } bench;
 
-long unixtime();
+unsigned long unixtime();
 
 double microtime();
 
@@ -37,6 +37,8 @@ void bench_print_summary(bench *b);
 
 double bench_duration(bench *b);
 
+void bench_append_csv(char *filename, int countOfB, ...);
+
 #define BENCHMARK(B) \
         bench B; B.N = 5000000; B.R = 3; \
         bench_start(&B); \
@@ -55,4 +57,5 @@ double bench_duration(bench *b);
     fprintf(fp, "%ld,%.2f\n", unixtime(), (B.N * B.R) / (B.end - B.start)); \
     fclose(fp);
 
+
 #endif /* !BENCH_H */
diff --git a/tests/bench_str.csv b/tests/bench_str.csv
index a10d1c5..79871fd 100644
--- a/tests/bench_str.csv
+++ b/tests/bench_str.csv
@@ -443,3 +443,4 @@
 1400668574,13632260.72
 1400681414,10832905.89
 1400685490,13185955.87
+1400762875,10472029.42