Online Method Handle Deduplication via Equivalence Pool
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Solution Overview
Problem
Current JVM solutions fail to effectively manage equivalent method handles, leading to increased memory usage and decreased Just-In-Time (JIT) performance due to redundant JIT compilations and native code generation, as they do not address method handle duplication.
Innovation Solution
An online method handle deduplication system that compares newly created method handles to existing ones in an equivalence pool, returning the existing unique method handle when equivalence is found, thereby reducing memory usage and unnecessary JIT compilations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If method handles are created for each method invocation in JVM, then dynamic language support and flexibility are improved, but memory usage increases and JIT performance deteriorates due to redundant compilations
Solution Approach 1:
The patent merges equivalent method handles by maintaining an equivalence pool that stores unique method handle representations. When a new method handle is created, the system checks if an equivalent one already exists in the pool and reuses it, thereby combining multiple equivalent handles into a single unique representation and reducing memory consumption.
Solution Approach 2:
The system changes the parameter representation of method handles by using equivalence classes instead of individual handle instances. Method handles with equivalent parameters (same method, same arguments, same method handle map) are grouped together and represented by a single unique handle, effectively changing how handles are parameterized and stored.
2Ease of operation
If equivalent method handles are created separately, then method handle operations are simplified, but the number of JIT compilations increases and native code generation becomes redundant
Solution Approach 1:
The patent merges equivalent method handles into a single unique representation in the equivalence pool. This consolidation ensures that JIT compilation is performed only once for each unique method handle equivalence class, eliminating redundant compilations and improving overall JIT compilation efficiency while maintaining simple handle operations.
Solution Approach 2:
Instead of creating separate method handle instances for each invocation, the system creates a single unique handle in the equivalence pool and provides references or copies to this unique handle. This approach maintains operational simplicity while avoiding the proliferation of duplicate handles that would trigger redundant compilations.
3Quantity of substance
If method handle equivalence checking is implemented, then memory usage and JIT compilation count are reduced, but system complexity increases
Solution Approach 1:
The patent introduces an intermediary equivalence pool that mediates between method handle creation and memory storage. This pool acts as a buffer that automatically checks for equivalence using hashing and comparison logic, thereby reducing memory usage without significantly increasing overall system complexity, as the intermediary handles the complex equivalence checking internally.
Solution Approach 2:
The equivalence pool implements self-service mechanisms by automatically checking for equivalent method handles using internal hashing and comparison algorithms. This self-service approach to equivalence checking reduces the need for external complexity management, as the system autonomously handles deduplication and memory optimization without requiring complex external control mechanisms.
Data Source
AI summary
Approaches presented herein enable providing online method handle deduplication by determining whether a method handle to be created is equivalent to an existing method handle in an equivalence pool. Specifically, in response to a request to create a method handle, a set of parameters including a method handle map, a class, and one or more arguments of the method handle to be created are accepted. A method handle of the class is obtained. One or more existing unique method handles found in an equivalence pool are compared to the method handle to be created to determine whether an equivalence exists. When an equivalence is found between an existing unique method handle and the method handle to be created, the existing unique method handle is returned.