X-Git-Url: https://git.ozlabs.org/?a=blobdiff_plain;f=ccan%2Ftimer%2Fbenchmarks%2Fbenchmark.c;fp=ccan%2Ftimer%2Fbenchmarks%2Fbenchmark.c;h=cb7120a6c1057243db69bd6ce05e20e3b4ba8e6b;hb=606cca7b0ed5236d1df1c4436ca79db6e3fd5321;hp=0000000000000000000000000000000000000000;hpb=c289035bc960c7316208133cc44bf6f968498613;p=ccan

diff --git a/ccan/timer/benchmarks/benchmark.c b/ccan/timer/benchmarks/benchmark.c
new file mode 100644
index 00000000..cb7120a6
--- /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;
+}