Abstract: Chip multiprocessor(CMP) with low-power dissipation,lowcost advantages becomes rapidly the leading role of the market,and it provides hardware support for multithread．Column-store has significant advantages in analytical applications．Query optimization is one of the key issues in column-store．In column-store,multi-core resources can improve performance of query processing．In order to improve query performance of column-stores,this paper established passing block buffer to make main thread and worker thread to read and write respectively different passing blocks,so parent node and child node of physical execution tree execute parallel．We used classic producer-consumer pattern to solve the problem of synchronization between the threads．In column-stores DWMS developed by our laboratory,experimental results on benchmark data set SSB show the effectiveness of this design,and it can improve 50% execution performance for some typical complex queries.

Key words: Multithread,Multicore,Column-store,Passing block buffer,Parallel processing