Qingqing,
>> I am considering add an "ice-broker scan thread" to accelerate PostgreSQL
>> sequential scan IO speed. The basic idea of this thread is just like the
>> "read-ahead" method, but the difference is this one does not read the
>> data
>> into shared buffer pool directly, instead, it reads the data into file
>> system cache, which makes the integration easy and this is unique to
>> PostgreSQL.
You probably mean "ice-breaker" by the way :)
Chris