Memory Dump Coordinator Serializes I/O to Prevent Peak Flow
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Solution Overview
Problem
Traditional memory dump processes are inefficient due to instantaneous peak flows of disk I/O transmission, leading to decreased performance, especially in multi-core processor systems where multiple logical CPUs operate independently, causing resource waste and the need for reentrant storage device drivers.
Innovation Solution
A method and apparatus for memory dump processing that invokes a first set of processing units to process a first stage of memory dump processing for each memory block, followed by subsequent processing stages, allowing for serial writing of memory blocks into a storage device, thereby avoiding peak disk I/O flows and eliminating the need for reentrant storage device drivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple logical CPUs process memory blocks in parallel independently, then processing speed is improved, but instantaneous peak flow of disk I/O transmission occurs causing performance decrease
Solution Approach 1:
The patent introduces a coordinator component that acts as an intermediary between multiple logical CPUs and the storage device. This coordinator manages and schedules disk I/O operations, serializing access to the storage device while allowing multiple CPUs to continue processing memory blocks in parallel. The coordinator buffers and queues I/O requests, preventing instantaneous peak flows from overwhelming the storage subsystem.
Solution Approach 2:
The system dynamically adjusts the level of parallelism in disk I/O operations based on storage device capacity and current load conditions. The coordinator can adjust the number of concurrent I/O operations, queue depths, and scheduling policies in real-time to optimize performance while preventing overwhelming the storage subsystem.
2Productivity
If multiple logical CPUs perform disk I/O transmission simultaneously, then dump processing is accelerated, but resource waste occurs due to lack of coordination
Solution Approach 1:
The patent segments the memory dump processing into distinct stages: memory block processing by logical CPUs, coordination and scheduling by the coordinator, and actual disk I/O execution. This segmentation allows each component to specialize and operate efficiently, with the coordinator optimizing resource allocation and preventing redundant or wasted operations.
Solution Approach 2:
The coordinator ensures continuous utilization of processing resources by maintaining a pipeline where memory blocks are continuously processed by logical CPUs while I/O operations are continuously executed by the storage device. The coordinator bridges these continuous operations, preventing idle time and resource waste through efficient scheduling and load balancing.
3Device complexity
If a single logical CPU handles traditional dump, then system simplicity is maintained, but computing power of multi-core processor is wasted
Solution Approach 1:
The coordinator component serves multiple functions: it manages I/O scheduling, coordinates between multiple logical CPUs and the storage device, handles error recovery, and optimizes resource allocation. This multi-functional design allows the system to leverage multiple cores effectively while maintaining a relatively simple overall architecture, as the coordinator consolidates multiple responsibilities in a single management point.
Data Source
AI summary
The present application provides a method, an apparatus and a system for memory dump processing. The method comprises: invoking a first set of processing units to process a first stage of memory dump processing for each of memory blocks; invoking each set of processing units other than the first set of processing units to process a subsequent processing stage after completing the first stage respectively, to write the memory blocks into a storage device. The technical solutions provided in the present application enable processing each stage for each of the memory blocks in a pipeline manner, avoid instantaneous peak flow of disk I/O transmission and improve memory dump performance.