xxhash3 bench

src/osd/osd.cpp

@@ -8,6 +8,7 @@
 #include <netinet/tcp.h>
 #include <arpa/inet.h>
 
+#include "xxhash.h"
 #include "addr_util.h"
 #include "osd_primary.h"
 #include "osd.h"
@@ -15,8 +16,46 @@
 #include "str_util.h"
 #include "json_util.h"
 
+void xxhash_run_test(XXH3_state_t *st, void *buf, size_t size)
+{
+    timespec tv, tv1;
+    clock_gettime(CLOCK_REALTIME, &tv);
+    uint64_t res = 1;
+    uint64_t done = 0;
+    while (true)
+    {
+        XXH3_64bits_reset(st);
+        XXH3_64bits_update(st, buf, size);
+        res *= XXH3_64bits_digest(st);
+        done++;
+        if (!(done % 100000))
+        {
+            clock_gettime(CLOCK_REALTIME, &tv1);
+            if ((tv1.tv_sec-tv.tv_sec)*1000 + (tv1.tv_nsec-tv.tv_nsec)/1000000 > 1000)
+                break;
+        }
+    }
+    double sec = (tv1.tv_sec-tv.tv_sec) + (tv1.tv_nsec-tv.tv_nsec)/1000000000.0;
+    fprintf(stderr, "xxhash3: %lu %zu byte blocks in %.2f sec = %.1f MB/s\n",
+        done, size, sec, done*size/sec/1024/1024);
+}
+
+void xxhash_bench()
+{
+    std::vector<uint8_t> buf;
+    buf.resize(128*1024);
+    for (size_t i = 0; i < buf.size(); i++)
+        buf[i] = ((i+37)*3) % 255;
+    XXH3_state_t *st = XXH3_createState();
+    xxhash_run_test(st, buf.data(), 4096);
+    xxhash_run_test(st, buf.data(), buf.size());
+    XXH3_freeState(st);
+}
+
 osd_t::osd_t(const json11::Json & config, ring_loop_t *ringloop)
 {
+    xxhash_bench();
+
     zero_buffer_size = 1<<20;
     zero_buffer = malloc_or_die(zero_buffer_size);
     memset(zero_buffer, 0, zero_buffer_size);