9.2

1 files changed, 5 insertions, 3 deletions

diff --git a/zen/guid.h b/zen/guid.h
index d88578a6..b34c3cbf 100755
--- a/zen/guid.h
+++ b/zen/guid.h
@@ -20,9 +20,11 @@ namespace zen
 inline
 std::string generateGUID() //creates a 16-byte GUID
 {
-    boost::uuids::uuid nativeRep = boost::uuids::random_generator()();
-    //generator is only thread-safe like an int, so we keep it local until we need to optimize perf
-    //perf: generator: 0.22ms per call; retrieve GUID: 0.12µs per call
+    //perf: generator:		0.38ms per creation;
+	//		retrieve GUID:	0.13µs per call
+    //generator is only thread-safe like an int => keep thread-local
+    thread_local boost::uuids::random_generator gen;
+	const boost::uuids::uuid nativeRep = gen();
     return std::string(nativeRep.begin(), nativeRep.end());
 }
 }