SERVER-55041 Benchmark UUID generation and increase SecureRandom buffer size

3 files changed, 70 insertions, 4 deletions

diff --git a/src/mongo/platform/random.cpp b/src/mongo/platform/random.cpp
index 2d19fc79b35..00c3cb2a068 100644
--- a/src/mongo/platform/random.cpp
+++ b/src/mongo/platform/random.cpp
@@ -69,8 +69,10 @@ namespace mongo {
 
 namespace {
 
-template <size_t N>
+template <size_t Bytes>
 struct Buffer {
+    static constexpr size_t kArraySize = Bytes / sizeof(uint64_t);
+
     uint64_t pop() {
         return arr[--avail];
     }
@@ -84,7 +86,7 @@ struct Buffer {
         avail = arr.size();
     }
 
-    std::array<uint64_t, N> arr;
+    std::array<uint64_t, kArraySize> arr;
     size_t avail = 0;
 };
 
@@ -205,7 +207,7 @@ public:
 
 private:
     Source _source;
-    Buffer<16> _buffer;
+    Buffer<4096> _buffer;
 };
 
 SecureUrbg::SecureUrbg() : _state{std::make_unique<State>()} {}
diff --git a/src/mongo/util/SConscript b/src/mongo/util/SConscript
index 1bff532b04b..f3aa885ab3c 100644
--- a/src/mongo/util/SConscript
+++ b/src/mongo/util/SConscript
@@ -778,4 +778,16 @@ env.Benchmark(
 env.Benchmark(
     target='cancelation_bm',
     source='cancelation_bm.cpp',
-)
\ No newline at end of file
+)
+
+env.Benchmark(
+    target='uuid_bm',
+    source=[
+        'uuid_bm.cpp',
+    ],
+    LIBDEPS=[
+        '$BUILD_DIR/mongo/base',
+        'processinfo',
+    ],
+)
+
diff --git a/src/mongo/util/uuid_bm.cpp b/src/mongo/util/uuid_bm.cpp
new file mode 100644
index 00000000000..0489294707a
--- /dev/null
+++ b/src/mongo/util/uuid_bm.cpp
@@ -0,0 +1,52 @@
+/**
+ *    Copyright (C) 2011-present MongoDB, Inc.
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the Server Side Public License, version 1,
+ *    as published by MongoDB, Inc.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    Server Side Public License for more details.
+ *
+ *    You should have received a copy of the Server Side Public License
+ *    along with this program. If not, see
+ *    <http://www.mongodb.com/licensing/server-side-public-license>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the program with the OpenSSL library. You
+ *    must comply with the Server Side Public License in all respects for
+ *    all of the code used other than as permitted herein. If you modify file(s)
+ *    with this exception, you may extend this exception to your version of the
+ *    file(s), but you are not obligated to do so. If you do not wish to do so,
+ *    delete this exception statement from your version. If you delete this
+ *    exception statement from all source files in the program, then also delete
+ *    it in the license file.
+ */
+
+#include "mongo/platform/basic.h"
+
+#include <benchmark/benchmark.h>
+
+#include "mongo/util/uuid.h"
+
+#include "mongo/util/processinfo.h"
+
+namespace mongo {
+namespace {
+
+void BM_UuidGen(benchmark::State& state) {
+    for (auto keepRunning : state) {
+        benchmark::DoNotOptimize(UUID::gen());
+    }
+}
+
+const auto kConcurrencyLimit = 2 * ProcessInfo::getNumAvailableCores();
+
+BENCHMARK(BM_UuidGen)->ThreadRange(1, kConcurrencyLimit);
+
+}  // namespace
+}  // namespace mongo