Bridge Element Packet Time Stamping for Atomic Operation Validation
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Solution Overview
Problem
Multiprocessor systems face challenges in validating and debugging atomic operations, particularly atomic read-modify-write instructions, due to their complexity and the difficulty in identifying errors that may be masked by other operations, leading to unexpected outputs and critical timing dependencies.
Innovation Solution
A multiprocessor technique that includes a bridge element with a buffer unit to time-stamp transactions and debug hardware for capturing and analyzing intra-node and inter-node transaction packets, allowing for the detection and reporting of errors in atomic operations by processing data related to packets transmitted between microprocessor cores.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If atomic read-modify-write operations are implemented in multiprocessor environments, then system functionality is improved, but validation and debugging difficulty increases due to masking errors and timing dependencies
Solution Approach 1:
The patent applies preliminary action by capturing and time-stamping transaction packets before errors can occur or be masked. The debug hardware intercepts packets at the bridge element, records their timestamps, and stores them in buffers for later analysis. This proactive capture allows post-processing validation of atomic operations without requiring complex runtime debugging mechanisms.
Solution Approach 2:
The patent introduces an intermediary debugging system between the processor cores and the memory system. The bridge element with its buffer unit acts as a mediator that captures transaction packets, time-stamps them, and makes them available for analysis. This intermediary layer enables external validation tools to examine atomic operations without interfering with normal system operation.
2Reliability
If extensive validation stimuli are applied to atomic operations, then error detection capability is improved, but system complexity and resource requirements increase
Solution Approach 1:
The patent creates a copy of the transaction packets through the buffer unit in the debug hardware. Instead of modifying the original transaction flow or adding complex validation logic to each processor core, the system captures packet copies at the bridge element. These copies can be analyzed extensively without affecting the actual atomic operations or requiring changes to the core processor architecture.
Solution Approach 2:
The debug hardware automatically captures and time-stamps all transaction packets without requiring external intervention or complex validation stimuli. The system self-services by continuously monitoring and recording atomic operations as they occur naturally in the multiprocessor environment, eliminating the need for specialized test equipment or complex test sequence generation.
3Difficulty of detecting and measuring
If time-stamping and packet capture hardware is added to validate atomic operations, then debugging capability is improved, but hardware complexity and cost increase
Solution Approach 1:
The bridge element with the buffer unit serves multiple functions: it acts as the normal communication interface between processor cores and memory, simultaneously functions as a packet capture point for debugging, and provides time-stamping services for atomic operation validation. This multi-functionality eliminates the need for separate dedicated debugging hardware, reducing overall system complexity.
Solution Approach 2:
The patent merges the debugging functionality into the existing bridge element that connects processor cores to memory. Rather than adding separate debug hardware, the time-stamping and packet capture capabilities are integrated into the bridge element's buffer unit. This consolidation reduces hardware complexity by combining multiple functions into a single component.
Data Source
AI summary
A multi-core microprocessor has a plurality of processor cores which are coupled to a bridge element. The bridge element sends transactions to and/or receives transactions from the processor cores, where each transaction has one or more packets. The transactions include atomic transactions. The bridge element comprises a buffer unit storing a time stamp for each packet sent or received. Furthermore, a multi-core multi-node processor system is provided that has debug hardware to capture and time stamp intra-node and/or inter-node transaction packets. Atomic operations are, for example, atomic read-modify-write instructions.