<div class="__aliyun_email_body_block"><div  style="clear:both;font-family:Tahoma,Arial,STHeiti,SimSun;">The current implementation always adds the task to the tail, but what if a map/reduce like work, which mean a fork() maybe better for performance/latency , but that will reduce some fairness.</div><div  style="clear:both;font-family:Tahoma,Arial,STHeiti,SimSun;"><span ><br ></span></div><div  style="clear:both;font-family:Tahoma,Arial,STHeiti,SimSun;"><span ><br ></span></div></div>