use steady_clock and rerun benchmark

facebook · Nov 29, 2024 · 7a8c9e1 · 7a8c9e1
1 parent 495cc8d
commit 7a8c9e1
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Showing 2 changed files with 18 additions and 18 deletions.
diff --git a/pdq/cpp/bin/benchmark-mih.cpp b/pdq/cpp/bin/benchmark-mih.cpp
@@ -140,11 +140,11 @@ static void do_test(char* argv0, int argc, char** argv) {
 
   facebook::pdq::index::MIH256<std::string> mih;
 
-  t1 = std::chrono::system_clock::now();
+  t1 = std::chrono::steady_clock::now();
   for (const auto& it : haystack) {
     mih.insert(it.first, it.second);
   }
-  t2 = std::chrono::system_clock::now();
+  t2 = std::chrono::steady_clock::now();
   elapsed_seconds_outer = t2 - t1;
   seconds = elapsed_seconds_outer.count();
   printf("\n");
@@ -172,12 +172,12 @@ static void do_test(char* argv0, int argc, char** argv) {
   matches.clear();
   num_matches = 0;
 
-  t1 = std::chrono::system_clock::now();
+  t1 = std::chrono::steady_clock::now();
   for (const auto& it : needles) {
     mih.bruteForceQueryAll(it.first, maxDistance, matches);
   }
   num_matches = matches.size();
-  t2 = std::chrono::system_clock::now();
+  t2 = std::chrono::steady_clock::now();
   elapsed_seconds_outer = t2 - t1;
   seconds = elapsed_seconds_outer.count();
 
@@ -195,12 +195,12 @@ static void do_test(char* argv0, int argc, char** argv) {
   matches.clear();
   num_matches = 0;
 
-  t1 = std::chrono::system_clock::now();
+  t1 = std::chrono::steady_clock::now();
   for (const auto& it : needles) {
     mih.queryAll(it.first, maxDistance, matches);
   }
   num_matches = matches.size();
-  t2 = std::chrono::system_clock::now();
+  t2 = std::chrono::steady_clock::now();
   elapsed_seconds_outer = t2 - t1;
   seconds = elapsed_seconds_outer.count();
 

diff --git a/pdq/cpp/index/README.md b/pdq/cpp/index/README.md
@@ -33,45 +33,45 @@ BRUTE-FORCE QUERY:
 NEEDLE COUNT:               1000
 HAYSTACK COUNT:             11000
 TOTAL MATCH COUNT:          1000
-SECONDS:                    0.311571
-SECONDS PER MATCH:          0.000312
+SECONDS:                    0.308996
+SECONDS PER MATCH:          0.000309
 
 MIH QUERY:
 NEEDLE COUNT:               1000
 HAYSTACK COUNT:             11000
 TOTAL MATCH COUNT:          1000
-SECONDS:                    0.237358
-SECONDS PER MATCH:          0.000237
+SECONDS:                    0.222451
+SECONDS PER MATCH:          0.000222
 
 
 $ ./benchmark-mih --distance 48
 BRUTE-FORCE QUERY:
 NEEDLE COUNT:               1000
 HAYSTACK COUNT:             11000
 TOTAL MATCH COUNT:          1000
-SECONDS:                    0.310662
-SECONDS PER MATCH:          0.000311
+SECONDS:                    0.309157
+SECONDS PER MATCH:          0.000309
 
 MIH QUERY:
 NEEDLE COUNT:               1000
 HAYSTACK COUNT:             11000
 TOTAL MATCH COUNT:          1000
-SECONDS:                    1.196939
-SECONDS PER MATCH:          0.001197
+SECONDS:                    1.106560
+SECONDS PER MATCH:          0.001107
 
 
 $ ./benchmark-mih --haystack-size 100000 --needles-size 5000
 BRUTE-FORCE QUERY:
 NEEDLE COUNT:               5000
 HAYSTACK COUNT:             105000
 TOTAL MATCH COUNT:          5000
-SECONDS:                    14.809405
-SECONDS PER MATCH:          0.002962
+SECONDS:                    14.732608
+SECONDS PER MATCH:          0.002947
 
 MIH QUERY:
 NEEDLE COUNT:               5000
 HAYSTACK COUNT:             105000
 TOTAL MATCH COUNT:          5000
-SECONDS:                    5.878446
-SECONDS PER MATCH:          0.001176
+SECONDS:                    5.529916
+SECONDS PER MATCH:          0.001106
 ```