Pipeline Stage Locks for Parallel Processing Order
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing software-based systems face challenges in maintaining processing order while enabling parallelism, particularly in multi-threaded environments where relative ordering of work is crucial, as simple synchronization methods constrain parallelism and lead to inefficiencies and coordination overhead.
Innovation Solution
The system divides work into stages with associated locks and queues, allowing threads to execute tasks in parallel while ensuring processing order through atomic operations and queue management, enabling concurrent execution without deadlocks or bottlenecks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If simple synchronization schemes are used to prevent race conditions, then processing order is maintained, but parallelism is constrained
Solution Approach 1:
The system segments the critical section into multiple checkpoints within the pipeline. Each pipeline stage has its own lock, allowing threads to acquire locks for specific stages rather than blocking on a single global lock. This segmentation enables fine-grained synchronization where threads can proceed through different pipeline stages in parallel while maintaining order within each stage.
Solution Approach 2:
The patent introduces pipeline stage locks as intermediary synchronization mechanisms between threads and pipeline resources. These stage-level locks act as mediators that coordinate access to specific pipeline stages without requiring threads to wait for global synchronization, thereby enabling concurrent execution across multiple stages while preserving processing order within each stage.
2Reliability
If a single lock is used for synchronization, then race conditions are prevented, but parallelism is completely disabled
Solution Approach 1:
The system replaces the single global lock with multiple stage-specific locks distributed across pipeline stages. Each lock protects a specific pipeline stage, allowing threads to acquire and release locks independently for different stages. This enables multiple threads to execute concurrently on different stages simultaneously, achieving true parallelism while maintaining synchronization where needed.
Solution Approach 2:
The patent transitions from a single-dimensional global lock to a multi-dimensional lock structure where locks are organized by pipeline stage. This dimensional transformation allows threads to navigate through multiple lock dimensions (stages) in parallel, with each dimension providing independent synchronization. Threads can progress through the lock dimension hierarchy without blocking other threads on unrelated stages.
3Productivity
If software threads implement pipeline stages on separate CPUs, then parallel processing is achieved, but coordination overhead and state transfer increase
Solution Approach 1:
The patent makes pipeline stage locks universal resources that can be accessed by any thread regardless of which CPU or core the thread is executing on. The lock mechanism is designed to be architecture-agnostic and thread-agnostic, allowing flexible assignment of pipeline stages to different processors while maintaining consistent synchronization semantics. This universality reduces coordination complexity by providing a single, standardized interface for inter-thread synchronization.
Solution Approach 2:
The system implements self-service synchronization where threads automatically acquire and release stage locks as they enter and exit pipeline stages, without requiring external coordination or manual management. The lock acquisition is integrated into the pipeline entry point, and release occurs automatically at stage completion, reducing the coordination burden on the system and eliminating the need for complex inter-processor signaling mechanisms.
Data Source
AI summary
A system and method for maintaining processing order while permitting parallelism. Processing of a piece of work is divided into a plurality of stages. At each stage, a task advancing the work towards completion is performed. By performing processing as a sequence of tasks, processing can be done in parallel, with progress being made simultaneously on different pieces of work in different stages by a plurality of threads of execution.