SERVER-33621 Warn if benchmark is not compiled with --opt=on

1 files changed, 8 insertions, 0 deletions

diff --git a/src/mongo/unittest/benchmark_main.cpp b/src/mongo/unittest/benchmark_main.cpp
index b714ace268a..119968e8370 100644
--- a/src/mongo/unittest/benchmark_main.cpp
+++ b/src/mongo/unittest/benchmark_main.cpp
@@ -35,6 +35,7 @@
 #include "mongo/base/initializer.h"
 #include "mongo/db/service_context.h"
 #include "mongo/db/service_context_registrar.h"
+#include "mongo/util/log.h"
 #include "mongo/util/signal_handlers_synchronous.h"
 
 
@@ -53,5 +54,12 @@ int main(int argc, char** argv, char** envp) {
     ::benchmark::Initialize(&argc, argv);
     if (::benchmark::ReportUnrecognizedArguments(argc, argv))
         return 1;
+
+#ifndef MONGO_CONFIG_OPTIMIZED_BUILD
+    ::mongo::log() << "***WARNING*** MongoDB was built with --opt=off. Function timings may be "
+                      "affected. Always verify any code change against the production environment "
+                      "(e.g. --opt=on).";
+#endif
+
     ::benchmark::RunSpecifiedBenchmarks();
 }