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issue: update 573b and 820a - baseline analysis complete, VPS upgrade required
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DanConwayDev
@@ -502,6 +502,46 @@ Currently relay.ngit.dev runs ngit-relay (reference implementation). Before migr
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3. Use baseline for relay.ngit.dev migration decision (issue 820a)
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3. Use baseline for relay.ngit.dev migration decision (issue 820a)
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4. Consider fixing container stats/FD counts in future if needed
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4. Consider fixing container stats/FD counts in future if needed
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### 2026-01-19 [Session 11:35] - Baseline Analysis Complete ✅
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- Completed: Comprehensive analysis of 36 hours of baseline metrics (2026-01-17 23:30 to 2026-01-19 11:35 UTC)
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- **CRITICAL FINDINGS:**
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1. **CPU severely overloaded:** Average 6.96 load (348% utilization on 2 cores), peak 11.83 (592%)
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2. **Memory maxed out:** 96.8% average usage, only 130MB available (3.2% free)
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3. **Swap heavily used:** 2.0GB average (40% of 5GB), growing over time (0.75GB → 2.5GB)
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4. **Connections NOT the problem:** Only 28-31 per relay (avg), 120-126 peak (3% of 4096 limit)
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5. **Load does NOT correlate with connections:** 0.210 correlation (weak) - confirms git operations are bottleneck
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- **Peak Usage Patterns:**
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- Peak hours: 16:00-20:00 UTC (load 6.5-9.9, connections 865-977)
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- Off-peak hours: 00:00-12:00 UTC (load 6.3-7.4, connections 350-470)
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- **Key insight:** Even off-peak shows HIGH load (6.3-7.4), indicating baseline overload independent of traffic
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- **Capacity Analysis:**
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- Current: 2 cores (348% utilized), 3.8GB RAM (96.8% utilized)
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- Required minimum: 4 cores, 8GB RAM (survival mode)
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- **Recommended: 6 cores, 8GB RAM** (healthy operation + migration headroom)
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- Optimal: 8 cores, 16GB RAM (future-proof)
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- **Migration Impact Assessment:**
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- **Current VPS (2-core, 4GB):** 🔴 HIGH RISK - Do NOT migrate relay.ngit.dev
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- **After upgrade to 4-core, 8GB:** 🟡 MEDIUM RISK - Proceed with caution
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- **After upgrade to 6-core, 8GB:** 🟢 LOW RISK - Recommended safe path
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- **After upgrade to 8-core, 16GB:** 🟢 LOW RISK - Optimal choice
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- **Data Quality Assessment:**
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- ✅ 36 hours continuous collection, 2,160 data points (60s intervals)
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- ✅ No gaps or missing data
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- ✅ Critical metrics working reliably
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- ✅ Clear patterns identified (peak hours, resource bottlenecks)
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- ✅ **Sufficient for migration decision** - no need for additional collection
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- **Recommendations:**
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1. **CRITICAL:** Upgrade VPS to 6-core, 8GB RAM BEFORE migrating relay.ngit.dev
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2. Verify upgrade impact (24-48 hours monitoring)
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3. Update migration timeline: Day 0-1 (VPS upgrade), Day 2-3 (prep), Day 4-5 (migrate), Day 5-7 (monitor)
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4. Medium-term: Optimize git operations (global semaphore, nice processes, event-driven sync)
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5. Long-term: Plan for growth (may need 8-core, 16GB within 6-12 months)
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- **Files Created:**
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- `/tmp/vps-baseline-report.md` - Comprehensive 36-hour analysis report
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- Analysis scripts: `/tmp/analyze_metrics.py`, `/tmp/hourly_analysis.py`
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- **Status:** Baseline collection COMPLETE ✅ - Proceed with VPS upgrade planning
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- **Next:** Update issue 820a with migration decision (VPS upgrade required first)
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### 2026-01-16 [Phase 0 Step 1 - Initial Scripts]
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### 2026-01-16 [Phase 0 Step 1 - Initial Scripts]
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- Completed: Created three bash diagnostic scripts
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- Completed: Created three bash diagnostic scripts
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- Issue: Scripts not compatible with NixOS declarative philosophy
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- Issue: Scripts not compatible with NixOS declarative philosophy
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@@ -250,6 +250,49 @@ docker start ngit-relay
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3. Make migration decision based on baseline analysis
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3. Make migration decision based on baseline analysis
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4. Proceed with rapid preparation if baseline looks good
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4. Proceed with rapid preparation if baseline looks good
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### 2026-01-19 [Session 11:35] - Baseline Analysis Complete - VPS UPGRADE REQUIRED ⚠️
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- Completed: Comprehensive analysis of 36 hours of baseline metrics
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- **CRITICAL DECISION: Migration BLOCKED until VPS upgrade**
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- **Baseline Findings (2026-01-17 23:30 to 2026-01-19 11:35 UTC):**
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- **CPU:** Average 6.96 load (348% utilization), peak 11.83 (592%) - 🔴 SEVERELY OVERLOADED
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- **Memory:** 96.8% average usage, only 130MB available - 🔴 MAXED OUT
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- **Swap:** 2.0GB average (40% of 5GB), growing 0.75GB → 2.5GB - 🟡 HEAVILY USED
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- **Connections:** Port 8081: 28 avg/120 peak, Port 8083: 31 avg/126 peak - ✅ ONLY 3% OF CAPACITY
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- **Correlation:** Load vs connections = 0.210 (weak) - Confirms git operations are bottleneck, not connections
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- **Peak Usage Patterns:**
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- Peak hours: 16:00-20:00 UTC (load 6.5-9.9, connections 865-977)
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- Off-peak hours: 00:00-12:00 UTC (load 6.3-7.4, connections 350-470)
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- **Critical insight:** Even off-peak shows HIGH load (6.3-7.4), indicating baseline overload independent of traffic
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- **Migration Risk Assessment:**
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- **Current VPS (2-core, 4GB):** 🔴 **HIGH RISK** - Migration will add load spike to already overloaded system
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- **Outcome:** High probability of service degradation or outages during migration
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- **Recommendation:** ❌ **DO NOT MIGRATE** on current VPS
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- **VPS Upgrade Requirements:**
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- **Minimum (Survival):** 4 cores, 8GB RAM (~$20-40/month) - 🟡 MEDIUM RISK
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- **Recommended (Healthy):** 6 cores, 8GB RAM (~$40-60/month) - 🟢 LOW RISK ✅
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- **Optimal (Future-proof):** 8 cores, 16GB RAM (~$60-100/month) - 🟢 LOW RISK
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- **Decision:** Upgrade to 6-core, 8GB minimum before migration
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- **Updated Migration Timeline:**
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- **REVISED:** 5-7 days total (was 3-5 days)
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- **Day 0-1:** VPS upgrade + verification (NEW - CRITICAL)
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- **Day 2-3:** Rapid preparation
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- **Day 4-5:** Migration execution
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- **Day 5-7:** Intensive monitoring
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- **Data Quality:**
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- ✅ 36 hours continuous collection, 2,160 data points
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- ✅ Clear patterns identified, no anomalies
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- ✅ **Sufficient for migration decision** - no additional collection needed
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- ✅ Findings are conclusive: VPS upgrade required
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- **Next Steps:**
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1. **CRITICAL:** Upgrade VPS to 6-core, 8GB RAM (BLOCKER for migration)
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2. Verify upgrade impact (24-48 hours monitoring, expect load to drop to ~60-70%)
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3. Proceed with accelerated migration plan (Day 2-7)
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4. Monitor intensively during and after migration
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- **Files Created:**
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- `/tmp/vps-baseline-report.md` - Comprehensive 36-hour analysis with migration scenarios
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- **Status:** Baseline complete ✅, Migration BLOCKED ⚠️ pending VPS upgrade
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- **Blocker:** VPS upgrade to 6-core, 8GB RAM required before migration can proceed
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## Notes
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## Notes
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- **Related issue:** 573b-production-timeout-diagnosis.md (timeout investigation that led to this)
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- **Related issue:** 573b-production-timeout-diagnosis.md (timeout investigation that led to this)
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