Thread-Local Buffering for Real-Time Text Logging Latency
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Solution Overview
Problem
Conventional real-time software control systems struggle with performing text logging in a real-time safe manner, leading to blocking operations and increased latency due to synchronization requirements, which can result in missed control cycles and emergency stops in systems like industrial robots.
Innovation Solution
Implementing thread-local buffering with real-time safe commands to allocate dedicated buffers for each thread, allowing non-blocking and deterministic logging, ensuring messages are written efficiently within strict timing constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional text logging is implemented in real-time control systems, then logging functionality is provided, but blocking operations and increased latency occur due to synchronization requirements
Solution Approach 1:
The patent segments the logging system into two distinct parts: a real-time safe buffer management layer and a non-real-time output processing layer. Each real-time thread has its own dedicated buffer, separating buffer allocation from buffer processing. This segmentation allows real-time threads to write to buffers without blocking, while output processing occurs asynchronously, resolving the contradiction between providing logging functionality and avoiding latency.
Solution Approach 2:
The patent introduces buffers as intermediary structures between real-time threads and the output processing system. These buffers act as mediators that decouple the real-time logging requirements from the non-real-time output operations. The buffers absorb the timing differences between message production and consumption, eliminating blocking operations and reducing latency while maintaining logging reliability.
2Reliability
If synchronization mechanisms are used to control access to shared memory resources for logging, then thread safety is improved, but blocking and delays of critical functions occur
Solution Approach 1:
The patent eliminates the need for synchronization mechanisms by segmenting memory resources into thread-local buffers. Each real-time thread owns its dedicated buffer, removing shared memory access entirely. This segmentation provides inherent thread safety without requiring locks or other synchronization primitives, thus maintaining both thread safety and high execution speed for critical functions.
Solution Approach 2:
Each thread manages its own dedicated buffer independently without requiring services from other threads or synchronization coordination. This self-service approach to buffer management eliminates blocking operations on critical functions while maintaining thread safety through ownership-based isolation, resolving the contradiction between thread safety and execution speed.
3Reliability
If thread pooling is used for logging, then logging capacity is increased, but efficiency decreases and latency increases due to thread allocation overhead
Solution Approach 1:
The patent segments the logging architecture into one real-time thread per control task, each with its own dedicated buffer, rather than using a pooled approach. This segmentation eliminates thread allocation overhead because buffers are statically allocated to threads at initialization. The design maintains high logging capacity through dedicated per-thread buffers while achieving high efficiency by eliminating dynamic thread management, resolving the contradiction between logging capacity and efficiency.
Data Source
AI summary
Methods, systems, and apparatus, including computer programs encoded on computer storage media, for performing real-time text logging. One of the methods comprises receiving, by a real-time robotics control framework, multiple indications of multiple events associated with multiple log messages. For each log message of the multiple log messages, the method further includes writing, by a real-time thread, characters of the log message into a buffer dedicated to the real-time thread using real-time safe commands, receiving, by a non-real-time thread of the real-time robotics control framework, an indication that the log message has been written into the buffer, and reading the log message and writing to a non-real-time output channel.