分区全局地址空间
分区全局地址空间（PGAS）是一种并行编程模型，它将全局内存划分为本地和远程部分，每个进程或线程拥有一个私有的本地内存区域，同时可以直接访问其他进程的远程内存。PGAS模型结合了共享内存编程的易用性和分布式内存编程的可扩展性，在科学计算和大规模数据处理领域得到广泛应用。常见的PGAS实现包括统一并行C（UPC）、Coarray Fortran、Chapel和X10等编程语言。
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