ZERG Rush Performance Optimization

ZERG Rush Performance Optimization

Status: APPROVED Created: 2026-02-03

Problem Statement

Rush execution for github-issues-batch (9 tasks, 5 levels) took ~6 hours when it should take ~30-60 minutes.

Root Cause

Primary: Gate Executions Per Level

Minimum safe gates: 10 total (2 per level × 5 levels) Current with loops: 15-30 total (3-6 per level × 5 levels)

Secondary: 7,624 Tests

PR #115 (bf51949) added 2,190+ test lines:

• test_resilience_e2e.py (809 lines)
• test_state_reconciler.py (882 lines)
• test_resilience_config.py (550 lines)

Requirements

REQ-1: Config Changes

• Set staleness_threshold_seconds: 1800 (30 min cache)
• Set improvement_loops.max_iterations: 1

REQ-2: Reuse Post-Merge Results

• Pass MergeFlowResult.gate_results to improvement loop
• Use as initial score instead of re-running gates

REQ-3: Add --skip-tests Flag

• New CLI flag for rush command
• Runs only lint gates during development
• Full test suite on final level only

REQ-4: Mark Slow Tests

• Add @pytest.mark.slow to resilience tests
• Split gate config: fast tests (required) vs slow tests (optional)

Files to Modify

Success Metrics

Verification

• pytest tests/ -x passes (no regressions)
• grep "Running gate: test" /tmp/rush*.log | wc -l shows ~5
• zerg rush --skip-tests completes in <15 min
• pytest -m slow --collect-only shows resilience tests marked

Implementation Steps

Step 1: Config Changes (5 min)

# .zerg/config.yaml additions
verification:
  staleness_threshold_seconds: 1800

improvement_loops:
  enabled: true
  max_iterations: 1

Step 2: Reuse Post-Merge Results (30 min)

• File: zerg/orchestrator.py ~line 574
• Pass MergeFlowResult.gate_results to _run_level_loop()
• Use as initial score instead of re-running gates

Step 3: Add --skip-tests Flag (1 hour)

• File: zerg/commands/rush.py - add CLI flag
• File: zerg/orchestrator.py - propagate flag to gate runner
• File: zerg/merge.py - respect flag in pre/post merge gates

Step 4: Mark Slow Tests (30 min)

• Files:
  • tests/unit/test_resilience_config.py
  • tests/unit/test_state_reconciler.py
  • tests/integration/test_resilience_e2e.py
• Add @pytest.mark.slow to test classes
• Update .zerg/config.yaml gate commands