Zijie Tian 39d12a0416 📈 feat: add MemoryObserver for GPU-CPU communication tracking ...

Implement MemoryObserver to track memory transfers between GPU and CPU:
- H2D (Host to Device): CPU → GPU transfers
- D2H (Device to Host): GPU → CPU transfers
- D2D (Device to Device): GPU buffer copies
- Supports prefill/decode phase separation

Integration points in offload_engine.py:
- load_to_slot_layer: H2D with is_prefill parameter
- offload_slot_layer_to_cpu, offload_prefill_buffer_async: D2H
- write_to_prefill_buffer, write_to_decode_buffer: D2D
- load_block_sample_from_cpu, load_block_full_from_cpu: H2D

Add bench_offload.py integration for memory stats printing.

Benchmark results (Llama-3.1-8B, 64K context):
- Full Policy: Prefill H2D 262.13 GB
- XAttention: Prefill H2D 386.62 GB (1.48x)

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

2026-01-28 04:06:45 +08:00

..

architecture_guide.md

✨ feat: add comprehensive RULER benchmark testing

2026-01-18 20:34:06 +08:00

bench_offload_results.md

📝 docs: add comprehensive GPU-only vs Offload benchmark results

2026-01-27 22:32:07 +08:00

block_sparse_attn_interface.md

📝 docs: add BSA interface documentation and cleanup temp files

2026-01-20 04:27:19 +08:00

chunked_attention_solutions.md

📝 docs: add chunked attention solutions guide and update doc index

2026-01-20 04:48:20 +08:00

cpu_offload_optimization_strategies.md

📝 docs: add CPU offload optimization strategies guide

2026-01-27 04:44:36 +08:00

cpu_scheduling_latency_analysis.md

📝 docs: add CPU scheduling latency analysis for chunked attention

2026-01-27 03:42:12 +08:00

cuda_graph_memory_guide.md

📝 docs: add CUDA Graph memory mechanism guide

2026-01-21 02:59:21 +08:00

cuda_graph_offload_guide.md

[docs] Added cuda_graph_guide.md

2026-01-21 21:56:24 +08:00

debugging_guide.md

✨ feat: add comprehensive RULER benchmark testing

2026-01-18 20:34:06 +08:00

gpu_only_sparse_integration.md

📝 docs: add GPU-only sparse policy integration baseline

2026-01-27 04:36:31 +08:00

gpu_only_xattn_guide.md

📝 docs: add GPU-Only XAttention guide with performance analysis

2026-01-27 07:21:46 +08:00

known_issues.md

✨ feat: add comprehensive RULER benchmark testing

2026-01-18 20:34:06 +08:00

memory_communication_benchmark.md

📈 feat: add MemoryObserver for GPU-CPU communication tracking

2026-01-28 04:06:45 +08:00

nsys_wrong_event_order_bug.md

📝 docs: add nsys wrong event order bug investigation

2026-01-24 04:32:05 +08:00

observer_architecture.md

📈 feat: add MemoryObserver for GPU-CPU communication tracking

2026-01-28 04:06:45 +08:00

optimization_guide.md

✨ feat: add comprehensive RULER benchmark testing

2026-01-18 20:34:06 +08:00

ruler_32k_chunked_offload_issue.md

🐛 fix: resolve CPU KV cache state leakage between requests

2026-01-21 01:12:21 +08:00

ruler_benchmark_results_32k.md

✨ feat: add comprehensive RULER benchmark testing

2026-01-18 20:34:06 +08:00

sparse_attention_guide.md

📝 docs: add XAttention algorithm guide based on COMPASS implementation

2026-01-20 02:50:03 +08:00

sparse_policy_architecture.md

♻️ refactor: remove cross-layer pipeline and rename compute_chunked_prefill

2026-01-20 02:10:40 +08:00

sparse_policy_implementation_guide.md

📝 docs: add SparsePolicy implementation guide and update rules

2026-01-20 02:25:46 +08:00

xattention_algorithm_guide.md

📝 docs: add XAttention algorithm guide based on COMPASS implementation

2026-01-20 02:50:03 +08:00

xattention_bsa_test_report.md

[WIP] Before integrate the xattn operator.

2026-01-19 21:19:21 +08:00

xattn_bsa_policy_design.md

📝 docs: update XAttention BSA Policy with benchmarks and memory management

2026-01-23 09:35:18 +08:00

xattn_chunked_prefill.md

feat: add xattn_estimate_chunked for chunked prefill support

2026-01-22 01:13:17 +08:00

xattn_kernels_guide.md

docs: add XAttention kernels guide

2026-01-23 03:22:25 +08:00

xattn_performance_analysis.md

📝 docs: add XAttention performance analysis documentation

2026-01-28 00:57:20 +08:00