python sdk对multiprocessing库的支持

需要先大致研究下multiprocessing的原理&用法；
在看下怎么升级使得python sdk对multiprocessing用户更友好。
目前的实现容易让multiprocessing用户踩坑。

Start by researching Python's multiprocessing model and how the Python SDK is currently used with it. The issue does not name any SDK files, tests, entry points, or a concrete failure case, so first identify the multiprocessing-related integration and reproduce the reported pitfalls. Done means multiprocessing users can use the SDK without the current hazards, with tests documenting the supported behavior.

Written by the indexing model from the issue text.