llnl / dftracer-utils / 26043728131

coverage: 51.706% (-0.4%) from 52.076%
26043728131

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hariharan-devarajan 
feat(perf): performance improvements for parallel reading, indexing, and aggregation

Indexer
- Streaming parse-and-emit worker pipeline with bounded memory usage
- Concurrent SST artifact ingestion with staging support
- Gzip member slicing for parallel indexing
- Lazy decoding for compressed value counts
- Bypass DOM wrapper for indexer hot path (simdjson on_demand)
- Decoupled write workers from parse workers
- --rebuild-summaries flag and optimized root summary rebuild

Aggregator / MPI
- Task-based DAG execution for aggregator pipeline
- Shared staging for multi-node artifact relocation
- Per-node thread scaling to avoid oversubscription
- Unified distributed aggregation tracking, removed manifest consolidation
- Deterministic aggregation and intra-file parallelism

Trace reader / query
- Compiled predicate evaluation for AND-of-EQ queries
- Uniform-match shortcut for AND-of-EQ queries
- Line-range support for work items and checkpoint processing
- Optimized chunk pruning and checkpoint handling

Replay
- Pipelined replay with coroutines and channels
- JsonParser-based trace processing
- Optimized string handling and i/o buffering

Organize / writer / dft
- Parallel slice creation and merging in organize visitor
- Inline indexer in organize
- Gzip member tracking in writer
- Coroutine-based event dispatcher with extracted parse logic
- Batch flushing in organize visitor

Arrow / call_tree
- Optimized arrow conversion
- Arrow IPC support and improved save/load in call_tree

Build / infrastructure
- zlib-ng option, system simdjson fallback
- cgroup v1/v2 memory limit detection
- Auto-computed per-file memory estimates and batch sizes
- CI: perf branch trigger, formatting

Docs
- Rewritten indexer and trace reader API references

35907 of 90345 branches covered (39.74%)

Branch coverage included in aggregate %.

16869 of 21880 new or added lines in 137 files covered. (77.1%)

273 existing lines in 39 files now uncovered.

32021 of 41028 relevant lines covered (78.05%)

13164.29 hits per line

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72.9
/src/dftracer/utils/python/streaming_iterator.h


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