Multiprocessor Memory Consistency Protection via Dynamic Mode Switching
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Solution Overview
Problem
Multiprocessor computing systems face memory consistency errors, particularly during dynamic binary translation, due to differences in memory consistency models between source and target architectures, leading to potential system crashes.
Innovation Solution
A multiprocessor computer system with a mechanism to protect memory consistency, including a controller that adjusts modes based on execution behavior, a load monitor, an affinity unit, and a memory consistency protection unit to enforce stronger memory access ordering constraints, selectively applying active memory consistency protection to ensure synchronized operations across processors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic binary translation is used to execute program code from a different architecture, then code portability and adaptability are improved, but memory consistency errors increase due to differences in memory consistency models
Solution Approach 1:
The patent introduces a memory consistency protection unit as an intermediary component between the dynamic binary translation layer and the target architecture's memory subsystem. This unit monitors memory access patterns and inserts synchronization instructions to bridge the gap between source and target memory consistency models, enabling safe code execution without requiring exact model matching
Solution Approach 2:
The system dynamically adjusts memory access parameters by detecting load conditions and modifying memory operation characteristics. When memory consistency issues are detected, the protection unit changes memory access parameters by inserting barriers and fences to enforce stronger ordering constraints, adapting the memory behavior to match the source architecture's expectations
2Reliability
If memory consistency protection mechanisms are applied to enforce stronger memory access ordering constraints, then memory consistency reliability is improved, but system performance decreases due to additional synchronization overhead
Solution Approach 1:
Instead of applying memory consistency protection universally to all memory operations, the system uses selective monitoring and protection. The protection unit analyzes memory access patterns and applies synchronization mechanisms only to critical sections where consistency issues are detected, avoiding unnecessary overhead in memory operations that do not require additional protection
Solution Approach 2:
The memory consistency protection system is dynamic rather than static. It continuously monitors memory access patterns and adjusts the level of protection in real-time based on detected conditions. The system can enable or disable protection mechanisms depending on the current execution context, memory access characteristics, and detected consistency risks
3Speed
If processors execute multiple program threads simultaneously on different processors to improve parallelism, then execution speed is improved, but memory consistency errors increase due to relaxed ordering
Solution Approach 1:
The memory consistency protection unit implements feedback mechanisms that continuously monitor memory access patterns and execution behavior. When memory consistency violations or potential errors are detected, the system responds by inserting synchronization instructions or adjusting memory access ordering, creating a closed-loop system that adapts to maintain consistency while preserving parallel execution performance
Data Source
AI summary
Disclosed are a method and apparatus for protecting memory consistency in a multiprocessor computing system, relating to program code conversion such as dynamic binary translation. The exemplary multiprocessor computing system provides memory and multiple processors, and a set of controller/translator units TX1, TX2, TX3 arranged to convert respective application programs into program threads T1, T2, etc., which are executed by the processors. Each controller/translator unit sets a first mode where a single thread T1 executes on a single processor P1, orders a second mode for two or more threads T1, T2 that are forced to execute one at a time on a single processor P2 such as by setting affinity with that processor, and orders a third mode to selectively apply active memory consistency protection in relation to accesses to explicit or implicit shared memory while allowing the multiple threads T1, T2, T3, T4 to execute on the multiple processors.