PcloudStimBuff,IoUringAssmEngn: add frame assembly perf profiling

We now time the frame assembly sequence.

stimBuffApis/livoxGen1/ioUringAssemblyEngine.cpp

@@ -432,6 +432,9 @@ public:
 		// Initialize loop with number of slots
 		context->loop = AsynchronousLoop(engine.frameAssemblyDesc->numSlots);
 
+		// Record assembly start time
+		engine.assemblyStartTime = std::chrono::high_resolution_clock::now();
+
 		/**	FIXME:
 		 * I'm suspicious of this std::bind return object here. What if us
 		 * setting it to null inside of stop() doesn't actually cause the
@@ -528,6 +531,10 @@ public:
 		 */
 		// Ensure we only execute once using atomic exchange
 		if (context->handlerExecuted.exchange(true)) { return; }
+		// Record assembly end time
+		context->engine.assemblyEndTime =
+			std::chrono::high_resolution_clock::now();
+
 		// Cancel the timer, stop the engine and process frame, if any.
 		context->engine.assemblyCycleComplete();
 
@@ -851,5 +858,15 @@ void IoUringAssemblyEngine::printSlotBytes(size_t slotIndex, size_t nBytes)
 	}
 }
 
+std::chrono::milliseconds IoUringAssemblyEngine::getAssemblyDuration() const
+{
+	auto duration = assemblyEndTime - assemblyStartTime;
+	if (duration.count() < 0)
+	{
+		return std::chrono::milliseconds(0);
+	}
+	return std::chrono::duration_cast<std::chrono::milliseconds>(duration);
+}
+
 } // namespace stim_buff
 } // namespace smo