timers: implementation of lazily-ordered timers.

[ccan] / ccan / timer / benchmarks / benchmark.c

diff --git a/ccan/timer/benchmarks/benchmark.c b/ccan/timer/benchmarks/benchmark.c
new file mode 100644 (file)
index 0000000..cb7120a
--- /dev/null
+++ b/ccan/timer/benchmarks/benchmark.c
@@ -0,0 +1,53 @@
+#include <ccan/time/time.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#ifdef FIRST_APPROX
+#include "first-approx.c"
+#endif
+#ifdef SECOND_APPROX
+#include "second-approx.c"
+#endif
+#ifdef NO_APPROX
+#include "no-approx.c"
+#endif
+
+int main(int argc, char *argv[])
+{
+       struct timespec start, val, val2, end, diff;
+       unsigned int i, j, limit = atoi(argv[1] ?: "100000");
+       uint64_t val64;
+
+       val = start = time_now();
+       val64 = to_u64(start);
+       val2.tv_sec = 0;
+       val2.tv_nsec = 1;
+
+       for (j = 0; j < limit; j++) {
+               for (i = 0; i < limit; i++) {
+                       val = time_add(val, val2);
+                       val64 += to_u64(val2);
+               }
+       }
+
+       end = time_now();
+
+       printf("val64 says %lu.%09lu\n",
+              from_u64(val64).tv_sec,
+              from_u64(val64).tv_nsec);
+
+       printf("val says %lu.%09lu\n",
+              val.tv_sec,
+              val.tv_nsec);
+
+       if (time_greater(val, from_u64(val64)))
+               diff = time_sub(val, from_u64(val64));
+       else
+               diff = time_sub(from_u64(val64), val);
+
+       printf("Time %lluns, error = %i%%\n",
+              (long long)time_to_nsec(time_sub(end, start)),
+              (int)(100 * time_to_nsec(diff) / time_to_nsec(time_sub(val, start))));
+       return 0;
+}