linux下的pi多线程源码，可用，gcc下加-pthread编译-pi under the multi-threaded linux source code, available, gcc compiled under the Canada-pthread

在linux环境下，用pthread的方法求PI值-compute PI using pthread

用mpi库实现pi计算的并行计算，与pthread不同的是利用了集群节点的进程间通信概念-The parallel computing pi calculated using mpi library pthread different use of the cluster node interprocess communication concept