test the concurrency count

app.py

@@ -100,5 +100,5 @@ with gr.Blocks() as app:
     c = complete.click(generator_wrap(2, complete_fn), [inpt, max_tokens, min_tokens, alpha_f, alpha_p], [out, error_box] + G)
     c_stop.click(lambda: (complete.update(visible=True), c_stop.update(visible=False)), inputs=None, outputs=[complete, c_stop], cancels=[c], queue=False)
 
-app.queue()
+app.queue(concurrency_count=2)
 app.launch()