Coprocessor Offload for Memory Garbage Collection
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Solution Overview
Problem
Conventional memory garbage collection processes are resource-intensive and can hinder the performance of primary processors, as they perform memory management tasks that could be offloaded to reduce processing overhead.
Innovation Solution
A system where a primary processor communicates with a coprocessor to offload memory garbage collection tasks, with the coprocessor autonomously identifying unused memory allocations and sending instructions to the primary processor to free them, utilizing a bi-directional message queue for communication and managing memory representations in a secondary memory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the primary processor performs memory garbage collection tasks, then memory management is achieved, but the processor's performance is hindered due to resource-intensive operations
Solution Approach 1:
The patent extracts the garbage collection functionality from the primary processor and implements it as a separate coprocessor. The coprocessor receives memory allocation messages from the primary processor, maintains representations of memory allocations in its own memory, and autonomously performs garbage collection by determining which allocations are no longer needed and sending free messages back to the primary processor. This extraction eliminates the performance burden from the primary processor while maintaining reliable memory management.
Solution Approach 2:
The patent introduces a coprocessor as an intermediary between the primary processor and the memory management system. This coprocessor acts as a mediator that handles garbage collection tasks, communicating with the primary processor through message passing. The intermediary coprocessor buffers memory allocation information and performs garbage collection independently, reducing the direct interaction overhead between the primary processor and garbage collection operations.
2Reliability
If garbage collection is performed by the primary processor, then memory allocations are identified, but processing overhead increases
Solution Approach 1:
The patent extracts the energy-intensive garbage collection operations from the primary processor and relocates them to a dedicated coprocessor. The coprocessor maintains its own memory containing representations of all memory allocations made by the primary processor, allowing it to perform garbage collection independently without consuming the primary processor's computational resources or energy.
Solution Approach 2:
The patent implements a copy of the memory allocation structure within the coprocessor's memory. When the primary processor allocates memory, it sends a message to the coprocessor, which creates a corresponding representation in its own memory space. This copying approach allows the coprocessor to track and manage memory allocations without the primary processor directly maintaining duplicate structures, reducing overhead on the primary system.
3Productivity
If memory garbage collection is offloaded to a coprocessor, then primary processor workload is reduced, but system complexity increases
Solution Approach 1:
The patent introduces a coprocessor as an intermediary component that simplifies the overall system architecture by dedicating specific functionality to a separate unit. The coprocessor communicates with the primary processor through well-defined message interfaces, maintaining clear separation of concerns. This intermediary approach reduces complexity within the primary processor while organizing system complexity in a modular, manageable fashion.
Solution Approach 2:
The patent uses copying of memory allocation representations to enable the coprocessor to function independently. By maintaining copies of allocation information in the coprocessor's memory, the system avoids complex shared memory management and synchronization mechanisms, simplifying the inter-process communication protocol to straightforward message passing with clear send and receive operations.
Data Source
AI summary
A memory allocation message for each primary memory allocation in a primary memory made by a primary processor is received at a hardware memory management module. A representation of each primary memory allocation is allocated within a second memory in response to each memory allocation message. A determination is made, based upon the allocated representations of each primary memory allocation within the second memory, to free a primary memory allocation in the primary memory. A memory free message is sent to the primary processor instructing the primary processor to free the primary memory allocation in the primary memory.