Remote Memory Synchronization Using Unified Store Operations
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Solution Overview
Problem
Existing techniques for remote memory operations in multiprocessor systems suffer from significant latency and inefficiency due to the use of low-performance interconnects and the need for explicit memory synchronization operations, which are costly and complex, leading to increased overhead and reduced performance.
Innovation Solution
The method involves merging a memory store operation with a synchronization operation to create a self-synchronizing memory store operation, which is transmitted as a single unit and split at a point of consistency close to the destination, allowing the memory operation to execute before the synchronization operation, thereby reducing network latency and bandwidth overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If explicit memory synchronization operations are used for remote memory operations, then data consistency between processing units is ensured, but network latency and bandwidth overhead increase significantly
Solution Approach 1:
The patent combines the memory store operation and synchronization operation into a single unified remote memory operation. The source processing unit issues one operation that performs both the data transfer and the synchronization function, eliminating the need for separate synchronization operations over the network interconnect. This merging reduces the number of network transactions from multiple operations to a single operation, thereby reducing network latency and bandwidth overhead while maintaining data consistency through the atomic nature of the unified operation.
2Reliability
If multiple separate operations (memory store, synchronization, acknowledgment) are performed across the interconnect, then data transfer reliability is maintained, but the number of operations increases overhead and reduces performance
Solution Approach 1:
The patent merges multiple separate operations (memory store, synchronization, and acknowledgment) into a single unified remote memory operation. Instead of issuing separate operations for each function, the system issues one operation that accomplishes all three functions simultaneously. This reduces the total number of network transactions and associated overhead, improving operation efficiency while maintaining data transfer reliability through the atomic execution of the unified operation.
Solution Approach 2:
The patent introduces a synchronization object stored in memory that acts as an intermediary to coordinate between source and destination processing units. The unified operation updates this synchronization object atomically, and consumer threads monitor this object to determine when data is ready. This intermediary mechanism enables reliable data transfer with fewer direct communication operations between processing units, reducing network overhead while maintaining reliability.
3Quantity of substance
If data is divided into multiple segments for transfer, then large data blocks can be transmitted, but the number of operations and synchronization points increases
Solution Approach 1:
The patent divides large data blocks into multiple segments for transmission over the network interconnect. Each segment is transferred as a separate unified remote memory operation that includes its own synchronization functionality. This segmentation allows large volumes of data to be transmitted efficiently while maintaining manageable synchronization complexity, as each segment operates independently with its own atomic operation rather than requiring complex coordination for the entire data block.
Data Source
AI summary
Various embodiments include techniques for performing self-synchronizing remote memory operations in a multiprocessor computing system. During a remote memory operation in the multiprocessor computing system, a source processing unit transmits multiple segments of data to a destination processing. For each segment of data, the source processing unit transmits a remote memory operation to the destination processing unit that includes associated metadata that identifies the memory location of a corresponding synchronization object. The remote memory operation along with the metadata is transmitted as a single unit to the destination processing unit. The destination processing unit splits the operation into the remote memory operation and the memory synchronization operation. As a result, the source processing unit avoids the need to perform a separate memory synchronization operation, thereby reducing inter-processor communications and increasing performance of remote memory operations.