increase samples

bench.c

@@ -8,8 +8,8 @@
 void init(int fd);
 int64_t do_write(int fd, const void* buf, size_t count);
 
-const size_t warmup = 1000;
-const size_t iterations = 100000;
+const size_t warmup = 10000;
+const size_t iterations = 1000000;
 
 #define BUFSIZE 64