ccan/crc32c: new module for accelerated CRC32 (on x86-64).

[ccan] / ccan / crc32c / benchmark / bench.c

diff --git a/ccan/crc32c/benchmark/bench.c b/ccan/crc32c/benchmark/bench.c
new file mode 100644 (file)
index 0000000..54b2d97
--- /dev/null
+++ b/ccan/crc32c/benchmark/bench.c
@@ -0,0 +1,57 @@
+#include <ccan/tal/grab_file/grab_file.h>
+#include <ccan/tal/tal.h>
+#include <ccan/time/time.h>
+#include <ccan/crc32c/crc32c.c>
+#include <assert.h>
+#include <ccan/err/err.h>
+
+#define RUNS 65536
+
+int main(int argc, char *argv[])
+{
+       void *p;
+       struct timeabs start, end;
+       size_t len, runs;
+       uint64_t sums = 0;
+       bool sw = false, hw = false;
+
+       if (argv[1]) {
+               if (streq(argv[1], "--software")) {
+                       sw = true;
+                       argv++;
+                       argc--;
+
+               } else if (streq(argv[1], "--hardware")) {
+                       hw = true;
+                       argv++;
+                       argc--;
+               }
+       }
+
+       if (argc < 2 || (runs = atol(argv[1])) == 0)
+               errx(1, "Usage: bench <num-runs> [<file>]");
+
+       p = grab_file(NULL, argv[2]);
+       if (!p)
+               err(1, "Reading %s", argv[2] ? argv[2] : "<stdin>");
+       len = tal_count(p) - 1;
+       start = time_now();
+       if (sw) {
+               for (size_t i = 0; i < runs; i++)
+                       sums += crc32c_sw(0, p, len);
+       } else if (hw) {
+               for (size_t i = 0; i < runs; i++)
+                       sums += crc32c_hw(0, p, len);
+       } else {
+               for (size_t i = 0; i < runs; i++)
+                       sums += crc32c(0, p, len);
+       }
+       end = time_now();
+
+       assert(sums % runs == 0);
+       printf("%u usec for %zu bytes, sum=%08x\n",
+              (int)time_to_usec(time_divide(time_between(end, start), runs)),
+              len,
+              (unsigned int)(sums / runs));
+       return 0;
+}