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At Instagram, process and memory management is a frequent point of consideration in building large-scale, distributed, fault-tolerant systems. This need is augmented by many of our long-running applications, responsible for servicing and handling the requests of hundreds of millions of users. Since a large part of our stack is built on Python, one common approach to this problem is the pre-fork worker process model, where worker processes are forked before a request comes in. However, while this...