Adaptive Busy-Wait Time for Mutex Lock Threads
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In contemporary computing systems, threads spinning on mutex locks with default busy-wait times consume excessive computational resources and degrade system performance, as they either spin repeatedly or go to sleep, leading to inaccurate estimates of busy-wait times.
Innovation Solution
A method is introduced to selectively assign a reduced busy-wait time to threads spinning on mutex locks associated with condition variables, determining if other threads are waiting or spinning, thereby reducing the number of spins and enhancing system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If threads spin on mutex locks with default busy-wait time, then threads can acquire the mutex lock when it is released, but computational resources are consumed excessively and system performance degrades
Solution Approach 1:
The patent applies dynamics by making the busy-wait time adaptive rather than static. The system dynamically adjusts the busy-wait time based on the current state of the system, specifically whether other threads are waiting or spinning on the same mutex lock. This allows the thread behavior to adapt to changing conditions, reducing unnecessary spinning when other threads are already present, thereby conserving computational resources while maintaining reliable mutex lock acquisition.
2Reliability
If threads spin repeatedly on mutex locks, then threads can acquire the mutex lock when it is released, but the number of spins is inaccurate and system performance degrades
Solution Approach 1:
The patent implements feedback by having threads check whether other threads are waiting or spinning on the mutex lock before proceeding with spinning. This feedback mechanism allows the system to adjust the spinning behavior based on real-time information about the state of other threads. When feedback indicates that other threads are already present, the current thread reduces its spinning, thereby improving system performance while still ensuring reliable mutex lock acquisition when needed.
3Use of energy by moving object
If threads go to sleep instead of spinning, then computational resources are conserved, but threads may miss the mutex lock release and increase waiting time
Solution Approach 1:
The patent applies dynamics by implementing a state-dependent strategy where threads dynamically choose between spinning and sleeping based on the current system state. When other threads are not present, threads spin with reduced busy-wait time to quickly acquire the mutex lock, minimizing waiting time. When other threads are detected, threads can sleep to conserve computational resources. This dynamic adaptation resolves the contradiction between resource consumption and waiting time by optimizing the choice based on real-time conditions.
Data Source
AI summary
Method to selectively assign a reduced busy-wait time to threads is described. The method comprises determining whether at least one thread is spinning on a mutex lock associated with a condition variable and assigning, when the at least one thread is spinning on the mutex lock, a predetermined reduced busy-wait time for a subsequent thread spinning on the mutex lock.