Objective

Analyze test results, identify failures, and document all issues for RHEL 9.6 PyTorch build.

Work Completed

• Analyzed 5-shard test results (~20,400 tests)
• Identified and categorized all 215 test failures
• Created comprehensive failure analysis reports
• Compared RHEL vs Ubuntu CI performance and pass rates
• Documented root causes for each failure category

Test Coverage Results

Total tests: ~20,400
Passed: ~20,185
Failed: ~215
Pass rate: 99.0%

Failure Breakdown

• CUTLASS Backend: ~189 tests (missing library)
• Flex Attention: ~24 tests (H200 float16 alignment)
• cuDNN JIT: 1 test (compilation issue)
• RNN Flat Weights: 1 test (parameter handling)

Documentation Created

• 5_SHARD_FAILURE_SUMMARY.md - Detailed failure analysis
• 5_SHARD_ANALYSIS_REPORT.md - Performance analysis
• TEST_FAILURE_REPORT.md - Initial failure investigation
• RHEL_VS_UBUNTU_COMPARISON.md - Platform comparison

Deliverables

• [x] Complete test failure analysis
• [x] Root cause identification for all failures
• [x] Comprehensive documentation
• [x] Comparison with Ubuntu baseline