Invited Talk

Speaker: Atsushi Hori

Title: Why do we need another execution model?


The two most common parallel execution models for many-core CPUs today are multiprocess (e.g., MPI) and multithread (e.g., OpenMP). The multiprocess model allows each process to own a private address space, although processes can explicitly allocate shared-memory regions. The multithreaded model shares all address space by default, although threads can explicitly move data to thread-private storage. In this paper, we present a third model called process-in-process (PiP), where multiple processes are mapped into a single virtual address space. Thus, each process still owns its process-private storage (like the multiprocess model) but can directly access the private storage of other processes in the same virtual address space (like the multithread model). The idea of address-space sharing between multiple processes itself is not new. What makes PiP unique, however, is that its design is completely in user space, making it a portable and practical approach for large supercomputing systems where porting existing OS-based techniques might be hard. The PiP library is compact and is designed for integrating with other runtime systems such as MPI and OpenMP as a portable low-level support for boosting communication performance in HPC applications.

In this talk, it will be presented how the current parallel execution models, multi-process and multi-thread, are not adequate for many-core architectures. Then, Process-in-Process (PiP) runtime library to implement another execution model for HPC applications on modern architectures will be introduced. This talk is a complement of the talk in the main conference.