stringify: Reduce CPU usage by reusing stringstream in stringify function

About 10% CPU reduction and 10% TPS bump in CPU bound workload.

Signed-off-by: Evgeniy Firsov <evgeniy.firsov@sandisk.com>

diff --git a/src/include/stringify.h b/src/include/stringify.h
index 0a4c4dc5124b4999706e1fcbe97a0bc93ef6de98..59b7b3fb6acfd9c449242743920834eae11b3b8f 100644 (file)
--- a/src/include/stringify.h
+++ b/src/include/stringify.h
@@ -6,7 +6,8 @@
 
 template<typename T>
 inline std::string stringify(const T& a) {
-  std::ostringstream ss;
+  static __thread std::ostringstream ss;
+  ss.str("");
   ss << a;
   return ss.str();
 }