#5: LB: add work formula and task-cluster summary info

[lifflander]

Fixes #5

[Copilot]

Pull request overview

This PR adds work formula computation and task-cluster summary infrastructure to the load balancer, enabling more sophisticated load balancing decisions that account for computation, communication, and memory costs.

Key Changes

• Introduces a configurable work model with coefficients for compute load, inter-node communication, intra-node communication, and shared-memory communication
• Adds cluster summarization functionality that aggregates task and communication information at the cluster level
• Implements memory usage tracking and validation with breakdown by footprint, working memory, and serialized memory

Reviewed changes

Copilot reviewed 13 out of 14 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/vt-lb/algo/temperedlb/work_model.h	Defines WorkModel, WorkBreakdown, MemoryBreakdown structures and WorkModelCalculator for computing work from task/communication data
src/vt-lb/algo/temperedlb/work_model.cc	Implements work calculation logic including incremental updates and memory constraint checking
src/vt-lb/algo/temperedlb/configuration.h	Extracts Configuration struct from temperedlb.h with memory info accessors
src/vt-lb/algo/temperedlb/cluster_summarizer.h	Defines TaskClusterSummaryInfo and ClusterSummarizer for aggregating cluster-level statistics
src/vt-lb/algo/temperedlb/cluster_summarizer.cc	Implements cluster summarization including load, communication, and memory metrics
src/vt-lb/algo/temperedlb/temperedlb.h	Refactors TemperedLB to use new work model, adds trial-based execution and statistics computation
src/vt-lb/algo/temperedlb/visualize.h	Extends visualization to track and display intra-cluster communication bytes
src/vt-lb/algo/temperedlb/clustering.h	Adds utility function to verify all tasks are clustered and wraps code in namespace
src/vt-lb/model/PhaseData.h	Adds rank-level memory tracking fields (footprint bytes and max memory available)
src/vt-lb/model/Task.h	Reformats indentation for consistency
src/vt-lb/algo/baselb/baselb.h	Adds save/restore phase data methods for trial-based execution
src/vt-lb/comm/vt/proxy_wrapper.impl.h	Comments out debug printf statements
src/vt-lb/algo/temperedlb/symmetrize_comm.h	Adds blank line after header comment block
examples/test_example.cc	Removes polling loop from example code

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[Copilot]

Pull request overview

Copilot reviewed 14 out of 15 changed files in this pull request and generated 7 comments.

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