Rose Solver (v1.8.8)
This release introduces significant enhancements to solver capabilities, communication frameworks, and performance. New features like additional cuts, improved heuristics integration, and streamlined communication frameworks elevate the solver's efficiency and flexibility. Extensive refactoring ensures better resource management, fewer memory leaks, and enhanced thread safety. Bug fixes address issues with metrics, initialization, and zero constraint problems, while infrastructure updates further solidify the solver's reliability and extensibility.
New Features
- Introduced support for additional types of cuts, enhancing the solver's ability to handle specific optimization scenarios.
- Improved heuristics at the root node to now include both contests and heuristics. Heuristics run independently from the root contest, enabling more flexible strategies.
- Refactored strategy logic to better integrate heuristics into the workflow.
- Improved the communication framework by replacing some outdated modules with a single messenger system for simplified and thread-safe communication.
- Added metrics for send/receive operations and a debug mode for detailed message tracking.
Enhancements
- Major refactor of the load balancer, now using the new communication framework for consistency.
- Simplified and improved the branching logic, incorporating module communication for better coordination.
- Updated termination logic to operate within the new communication framework, with improved handling of user interruptions.
- Introduced condition variable synchronization for more reliable thread management.
- Enhanced the basic configuration to validate entries and ensure consistency across configuration files, adding Enum utility methods for better serialization and string conversion.
- Integrated fixes from for improved row parsing and stability.
Bug Fixes
- Resolved issues with basic metrics for rows, columns, and nonzeros, ensuring accurate reporting.
- Fixed issues with gap metrics, including integer solution and leaf node counts.
- Resolved an issue where zero constraint problems (e.g., maximize $x$, such that \(x\) is binary) were not completing correctly.
- Fixed a hang issue during multiple solves caused by improper state resetting in the layout manager.
- Corrected an issue where an initialization module was not receiving the correct JSON object, leading to improper submodule initialization.
- Addressed memory leaks related to heuristic classes and stuck messenger instances.
- Fixes for free row parsing bugs, improving the solver's handling of problematic cases.
- Resolved bugs related to final solution checking operations, ensuring proper functionality.
Cleanup and Optimizations
- Removed some outdated pre-solve components.
- Simplified logic by eliminating unused flags and labels, ensuring a streamlined process.
- Replaced custom spinlock and lock classes with standard packages.
- Ensured proper handling of multi-threaded access in the messenger system.
- Improved cleanup of unsolved nodes in the queue to prevent memory leaks and enhance performance.
Web Interface (v0.2.0)
No updates since last release of the SimpleRose platform.
Backend Components (v0.2.1)
This release enhances the deployment process with extensive new integrations, improved error handling, and additional stacks for networking, messaging, and database management. The updates also introduce robust support for the upcoming version of Rose solver, improved metrics tracking, and streamlined documentation, contributing to a more reliable and secure system. Significant progress in automation and cleanup ensures the codebase is optimized for future growth.
New Features
- Introduced a messaging stack for enhanced communication capabilities.
- ECS and Integration Test Stacks: Added ECS and integration test stacks for better testing and container orchestration.
- Integrated the database and Rose Worker stacks for seamless database and job management.
- Rose Service Stack: Introduced the Rose service stack to streamline operations.
- Increased security through the use of a new secrets manager.
- Allows for deployment regions to be configured per stack for greater flexibility.
Enhancements
- Prevented reading of solution JSON unless the status is feasible or optimal, ensuring accuracy in results.
- Captured basic settings from Rose output, providing users with clearer insights.
- Updated connections to support the upcoming version of Rose solver.
- Added release process details to team links for streamlined workflows.
- Corrected scripts to ensure users are added appropriately, improving usability.
- Introduced a proof of concept for running the solver with different tools, demonstrating potential scalability improvements.
Bug Fixes
- Resolved an issue with the metrics for canceled solves not being populated correctly.
- Reduced boilerplate code, making the implementation leaner and more maintainable.
- Removed unused code to declutter and streamline the project.
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