The BBP_PVM is a dialect of PVM for a scalable parallel computer cluster system that based on Bus-Bridge-Protoc01.The inter-machine communication protocol the BBP-PVM is called BBP-MPL,the message passing layer protocol of the bus bridge pro-toc01.The BBP-PVM is compatible with the original PVM version 3.3.4 and above,but it has a more effective communication mechanism than the original version.