VM Clock Synchronization for Distributed Software Debugging
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Solution Overview
Problem
In distributed virtual machine systems, software performance debugging is hindered by embedded instruments that increase execution time and cause delays, making concurrent task execution challenging due to mutual access and calling between function components on different physical machines.
Innovation Solution
A method and system for managing software performance debugging by controlling the system clock of VMs, intercepting and calculating the expected receipt time of data packets, and forwarding them based on timing comparisons to maintain consistent timing and prevent delays, thereby eliminating interference from debugging instruments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If debugging instruments are embedded into the system under test to generate diagnosis information, then software quality control capability is improved, but program execution overhead increases
Solution Approach 1:
The system is segmented into virtual machine components where debugging instruments are embedded only in specific VMs rather than the entire system. This allows diagnosis information generation to be distributed across multiple VMs, reducing the execution overhead impact on any single component while maintaining overall software quality control capability.
Solution Approach 2:
A time synchronization mechanism acts as an intermediary between distributed VMs to coordinate debugging operations. By introducing this intermediary layer, the system can manage the overhead of embedded instruments across multiple VMs without causing cumulative delays, thus resolving the contradiction between quality control and execution efficiency.
2Adaptability or versatility
If functions are distributed across multiple physical nodes in a distributed VM system, then system scalability and functionality are improved, but timing consistency and concurrent execution become more difficult
Solution Approach 1:
The system implements dynamic time adjustment mechanisms that adapt to the distributed nature of VMs across multiple physical nodes. Each VM can dynamically synchronize its clock with others, allowing the system to maintain timing consistency even as it scales to include more distributed nodes and functions.
Solution Approach 2:
A time synchronization feedback mechanism continuously monitors and adjusts the system clocks of distributed VMs. By implementing feedback loops that detect timing deviations and correct them, the system maintains timing consistency across distributed nodes while preserving scalability and adaptability.
3Reliability
If VMs are isolated from each other safely and independently in a distributed virtual environment, then system security and stability are improved, but mutual access and calling between VMs become more complex
Solution Approach 1:
The system implements a universal time synchronization mechanism that functions across all isolated VMs regardless of their specific configurations or locations. This multi-functional approach allows VMs to maintain their isolation and stability while providing a common interface for mutual access and coordination, reducing the complexity of inter-VM communication.
Data Source
AI summary
Managing software performance debugging based on a distributed VM system is provided. In response to determining a debugging state of a software system running on a VM, a timing of a system clock of the VM is controlled. A data packet sent to the VM from another VM is intercepted, and an added system time and reference time that indicate when the packet was sent by the other VM is extracted from the packet. Based on the system and reference times, as well as a reference time of when the packet is intercepted, a timing at which the packet is expected to be received by the VM is calculated. The packet is forwarded to the VM as a function of a comparison of the timing at which the packet is expected to be received and a system time of the VM when the packet is intercepted.