From fbe7528360ec97aacd145fe9fef0d4aff4a1f43f Mon Sep 17 00:00:00 2001
From: Henning Baldersheim <balder@yahoo-inc.com>
Date: Fri, 4 Jun 2021 10:10:28 +0000
Subject: Add benchmark for non POD objects.

---
 vespalib/src/tests/stllike/hashtable_test.cpp | 30 +++++++++++++++++++++++++--
 1 file changed, 28 insertions(+), 2 deletions(-)

(limited to 'vespalib')

diff --git a/vespalib/src/tests/stllike/hashtable_test.cpp b/vespalib/src/tests/stllike/hashtable_test.cpp
index 5f6f1601c84..aaecbb3833d 100644
--- a/vespalib/src/tests/stllike/hashtable_test.cpp
+++ b/vespalib/src/tests/stllike/hashtable_test.cpp
@@ -5,9 +5,9 @@
 #include <vespa/vespalib/stllike/hash_fun.h>
 #include <vespa/vespalib/stllike/identity.h>
 #include <vespa/vespalib/testkit/testapp.h>
+#include <vespa/vespalib/stllike/hash_map.hpp>
 #include <memory>
 #include <vector>
-#include <vespa/vespalib/stllike/hash_map.h>
 
 using vespalib::hashtable;
 using std::vector;
@@ -141,7 +141,7 @@ TEST("require that hashtable<vector<int>> can be copied") {
  * 2 - test     -  6.6s hash_node() : _next(invalid) { memset(_node, 0, sizeof(node)); }
  * 3 - current  -  2.3s hash_node() : _next(invalid) {}
  */
-TEST("benchmark clear") {
+TEST("benchmark hash table reconstruction with POD objects") {
     vespalib::hash_map<uint32_t, uint32_t> m(1000000);
     constexpr size_t NUM_ITER = 10; // Set to 1k-10k to get measurable numbers 10k ~= 2.3s
     for (size_t i(0); i < NUM_ITER; i++) {
@@ -155,6 +155,32 @@ TEST("benchmark clear") {
     }
 }
 
+class NonPOD {
+public:
+    NonPOD() : _v(rand()) {}
+    ~NonPOD() { _v = 0; }
+private:
+    uint32_t _v;
+};
+
+/**
+ * Performance is identical for NonPOD objects as with POD object.
+ * Object are are only constructed on insert, and destructed on erase/clear.
+ */
+TEST("benchmark hash table reconstruction with POD objects") {
+    vespalib::hash_map<uint32_t, NonPOD> m(1000000);
+    constexpr size_t NUM_ITER = 10; // Set to 1k-10k to get measurable numbers 10k ~= 2.3s
+    for (size_t i(0); i < NUM_ITER; i++) {
+        m[46] = NonPOD();
+        EXPECT_FALSE(m.empty());
+        EXPECT_EQUAL(1u, m.size());
+        EXPECT_EQUAL(1048576u, m.capacity());
+        m.clear();
+        EXPECT_TRUE(m.empty());
+        EXPECT_EQUAL(1048576u, m.capacity());
+    }
+}
+
 }  // namespace
 
 TEST_MAIN() { TEST_RUN_ALL(); }
-- 
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