From 835995a59eba8bae202dbec80491515fcef81fb0 Mon Sep 17 00:00:00 2001 From: DanConwayDev Date: Mon, 19 Jan 2026 10:46:46 +0000 Subject: [PATCH] issue: update 573b and 820a - baseline analysis complete, VPS upgrade required --- 573b-production-timeout-diagnosis.md | 40 ++++++++++++++++++++++++++ 820a-relay-ngit-dev-migration.md | 43 ++++++++++++++++++++++++++++ 2 files changed, 83 insertions(+) diff --git a/573b-production-timeout-diagnosis.md b/573b-production-timeout-diagnosis.md index f17f96e..39c1f32 100644 --- a/573b-production-timeout-diagnosis.md +++ b/573b-production-timeout-diagnosis.md @@ -502,6 +502,46 @@ Currently relay.ngit.dev runs ngit-relay (reference implementation). Before migr 3. Use baseline for relay.ngit.dev migration decision (issue 820a) 4. Consider fixing container stats/FD counts in future if needed +### 2026-01-19 [Session 11:35] - Baseline Analysis Complete ✅ +- Completed: Comprehensive analysis of 36 hours of baseline metrics (2026-01-17 23:30 to 2026-01-19 11:35 UTC) +- **CRITICAL FINDINGS:** + 1. **CPU severely overloaded:** Average 6.96 load (348% utilization on 2 cores), peak 11.83 (592%) + 2. **Memory maxed out:** 96.8% average usage, only 130MB available (3.2% free) + 3. **Swap heavily used:** 2.0GB average (40% of 5GB), growing over time (0.75GB → 2.5GB) + 4. **Connections NOT the problem:** Only 28-31 per relay (avg), 120-126 peak (3% of 4096 limit) + 5. **Load does NOT correlate with connections:** 0.210 correlation (weak) - confirms git operations are bottleneck +- **Peak Usage Patterns:** + - Peak hours: 16:00-20:00 UTC (load 6.5-9.9, connections 865-977) + - Off-peak hours: 00:00-12:00 UTC (load 6.3-7.4, connections 350-470) + - **Key insight:** Even off-peak shows HIGH load (6.3-7.4), indicating baseline overload independent of traffic +- **Capacity Analysis:** + - Current: 2 cores (348% utilized), 3.8GB RAM (96.8% utilized) + - Required minimum: 4 cores, 8GB RAM (survival mode) + - **Recommended: 6 cores, 8GB RAM** (healthy operation + migration headroom) + - Optimal: 8 cores, 16GB RAM (future-proof) +- **Migration Impact Assessment:** + - **Current VPS (2-core, 4GB):** 🔴 HIGH RISK - Do NOT migrate relay.ngit.dev + - **After upgrade to 4-core, 8GB:** 🟡 MEDIUM RISK - Proceed with caution + - **After upgrade to 6-core, 8GB:** 🟢 LOW RISK - Recommended safe path + - **After upgrade to 8-core, 16GB:** 🟢 LOW RISK - Optimal choice +- **Data Quality Assessment:** + - ✅ 36 hours continuous collection, 2,160 data points (60s intervals) + - ✅ No gaps or missing data + - ✅ Critical metrics working reliably + - ✅ Clear patterns identified (peak hours, resource bottlenecks) + - ✅ **Sufficient for migration decision** - no need for additional collection +- **Recommendations:** + 1. **CRITICAL:** Upgrade VPS to 6-core, 8GB RAM BEFORE migrating relay.ngit.dev + 2. Verify upgrade impact (24-48 hours monitoring) + 3. Update migration timeline: Day 0-1 (VPS upgrade), Day 2-3 (prep), Day 4-5 (migrate), Day 5-7 (monitor) + 4. Medium-term: Optimize git operations (global semaphore, nice processes, event-driven sync) + 5. Long-term: Plan for growth (may need 8-core, 16GB within 6-12 months) +- **Files Created:** + - `/tmp/vps-baseline-report.md` - Comprehensive 36-hour analysis report + - Analysis scripts: `/tmp/analyze_metrics.py`, `/tmp/hourly_analysis.py` +- **Status:** Baseline collection COMPLETE ✅ - Proceed with VPS upgrade planning +- **Next:** Update issue 820a with migration decision (VPS upgrade required first) + ### 2026-01-16 [Phase 0 Step 1 - Initial Scripts] - Completed: Created three bash diagnostic scripts - Issue: Scripts not compatible with NixOS declarative philosophy diff --git a/820a-relay-ngit-dev-migration.md b/820a-relay-ngit-dev-migration.md index 89bc960..91f5931 100644 --- a/820a-relay-ngit-dev-migration.md +++ b/820a-relay-ngit-dev-migration.md @@ -250,6 +250,49 @@ docker start ngit-relay 3. Make migration decision based on baseline analysis 4. Proceed with rapid preparation if baseline looks good +### 2026-01-19 [Session 11:35] - Baseline Analysis Complete - VPS UPGRADE REQUIRED ⚠️ +- Completed: Comprehensive analysis of 36 hours of baseline metrics +- **CRITICAL DECISION: Migration BLOCKED until VPS upgrade** +- **Baseline Findings (2026-01-17 23:30 to 2026-01-19 11:35 UTC):** + - **CPU:** Average 6.96 load (348% utilization), peak 11.83 (592%) - 🔴 SEVERELY OVERLOADED + - **Memory:** 96.8% average usage, only 130MB available - 🔴 MAXED OUT + - **Swap:** 2.0GB average (40% of 5GB), growing 0.75GB → 2.5GB - 🟡 HEAVILY USED + - **Connections:** Port 8081: 28 avg/120 peak, Port 8083: 31 avg/126 peak - ✅ ONLY 3% OF CAPACITY + - **Correlation:** Load vs connections = 0.210 (weak) - Confirms git operations are bottleneck, not connections +- **Peak Usage Patterns:** + - Peak hours: 16:00-20:00 UTC (load 6.5-9.9, connections 865-977) + - Off-peak hours: 00:00-12:00 UTC (load 6.3-7.4, connections 350-470) + - **Critical insight:** Even off-peak shows HIGH load (6.3-7.4), indicating baseline overload independent of traffic +- **Migration Risk Assessment:** + - **Current VPS (2-core, 4GB):** 🔴 **HIGH RISK** - Migration will add load spike to already overloaded system + - **Outcome:** High probability of service degradation or outages during migration + - **Recommendation:** ❌ **DO NOT MIGRATE** on current VPS +- **VPS Upgrade Requirements:** + - **Minimum (Survival):** 4 cores, 8GB RAM (~$20-40/month) - 🟡 MEDIUM RISK + - **Recommended (Healthy):** 6 cores, 8GB RAM (~$40-60/month) - 🟢 LOW RISK ✅ + - **Optimal (Future-proof):** 8 cores, 16GB RAM (~$60-100/month) - 🟢 LOW RISK + - **Decision:** Upgrade to 6-core, 8GB minimum before migration +- **Updated Migration Timeline:** + - **REVISED:** 5-7 days total (was 3-5 days) + - **Day 0-1:** VPS upgrade + verification (NEW - CRITICAL) + - **Day 2-3:** Rapid preparation + - **Day 4-5:** Migration execution + - **Day 5-7:** Intensive monitoring +- **Data Quality:** + - ✅ 36 hours continuous collection, 2,160 data points + - ✅ Clear patterns identified, no anomalies + - ✅ **Sufficient for migration decision** - no additional collection needed + - ✅ Findings are conclusive: VPS upgrade required +- **Next Steps:** + 1. **CRITICAL:** Upgrade VPS to 6-core, 8GB RAM (BLOCKER for migration) + 2. Verify upgrade impact (24-48 hours monitoring, expect load to drop to ~60-70%) + 3. Proceed with accelerated migration plan (Day 2-7) + 4. Monitor intensively during and after migration +- **Files Created:** + - `/tmp/vps-baseline-report.md` - Comprehensive 36-hour analysis with migration scenarios +- **Status:** Baseline complete ✅, Migration BLOCKED ⚠️ pending VPS upgrade +- **Blocker:** VPS upgrade to 6-core, 8GB RAM required before migration can proceed + ## Notes - **Related issue:** 573b-production-timeout-diagnosis.md (timeout investigation that led to this)