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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Performance Testing Monitoring</title>
<link href="https://fonts.googleapis.com/css2?family=Sora:wght@300;400;600;700;800&family=Space+Mono:wght@400;700&family=Fira+Code:wght@400;600&display=swap" rel="stylesheet">
<style>
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<div class="bg-blob c"></div>
<div class="page">
<div class="hero">
<div class="hero-badge">Monitoring Guide · Performance Engineering</div>
<h1>What Do We Monitor During Performance Testing?</h1>
<p class="hero-sub">The objective isn't just to generate load — it's to <strong>continuously monitor</strong> the entire system's behavior to identify bottlenecks, validate NFRs, and ensure stability.</p>
<div class="hero-goals">
<span class="hg">Identify Bottlenecks</span><span class="hg">Detect Failures</span><span class="hg">Validate NFRs</span><span class="hg">Analyze Scalability</span><span class="hg">Find Memory Leaks</span><span class="hg">Detect Slow Queries</span>
</div>
</div>
<!-- 3 PILLARS -->
<div class="pillars">
<div class="pillar pil-client"><div class="pil-icon">👤</div><div class="pil-title">Client-Side</div><div class="pil-desc">User perspective — Response Time, Throughput, Error Rate, Latency</div></div>
<div class="pillar pil-server"><div class="pil-icon">🖥️</div><div class="pil-title">Server-Side</div><div class="pil-desc">Infrastructure — CPU, Memory, Disk I/O, Network, Thread Pool</div></div>
<div class="pillar pil-apm"><div class="pil-icon">🔬</div><div class="pil-title">APM</div><div class="pil-desc">Code-level — DB Queries, GC, Cache Hit Ratio, Exceptions</div></div>
</div>
<!-- ════════════════════════════════════ CLIENT-SIDE ════════════════════════════════════ -->
<div class="cat-head">
<span class="cat-icon">👤</span>
<h2 style="color:var(--client)">1. Client-Side Metrics</h2>
<span class="cat-tag" style="background:var(--clientB);border:1px solid var(--clientD);color:var(--client);">User Perspective</span>
</div>
<!-- A. Response Time -->
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<div class="mc-bar"></div>
<div class="mc-head"><div class="mc-letter">A</div><h3>Response Time</h3><span class="mc-icon">⏱️</span></div>
<div class="mc-body">
<div class="mc-def" style="border-color:var(--s1);background:rgba(79,195,247,.06);">Total time from <strong>sending the request</strong> to <strong>receiving the complete response</strong>. Includes network delay, server processing, and data transfer.</div>
<div class="mc-formula" style="background:rgba(79,195,247,.06);border:1px solid rgba(79,195,247,.18);color:var(--s1);">Response Time = Network Delay + Server Processing + Data Transfer</div>
<table class="mc-table"><thead><tr><th>Metric</th><th>Meaning</th></tr></thead><tbody>
<tr><td>Average RT</td><td>Mean of all requests</td></tr>
<tr><td>90th Percentile</td><td>90% completed within this time</td></tr>
<tr><td>95th Percentile</td><td>Industry standard metric</td></tr>
<tr><td>Min / Max RT</td><td>Fastest / slowest request</td></tr>
</tbody></table>
<div class="mc-note"><strong>NFR Example:</strong> 95% of login requests should complete within 2 seconds.</div>
</div>
</div>
<!-- B. Throughput -->
<div class="metric-card c-s2">
<div class="mc-bar"></div>
<div class="mc-head"><div class="mc-letter">B</div><h3>Throughput</h3><span class="mc-icon">📊</span></div>
<div class="mc-body">
<div class="mc-def" style="border-color:var(--s2);background:rgba(129,199,132,.06);">Number of <strong>requests or transactions processed per unit time</strong>. Measures system capacity — higher throughput = better scalability.</div>
<div class="mc-formula" style="background:rgba(129,199,132,.06);border:1px solid rgba(129,199,132,.18);color:var(--s2);">Throughput = Total Requests / Time → e.g. 6000/60 = 100 RPS</div>
<div class="mc-tags">
<span class="mc-tag" style="background:rgba(129,199,132,.06);border:1px solid rgba(129,199,132,.18);color:var(--s2);">Requests/sec (RPS)</span>
<span class="mc-tag" style="background:rgba(129,199,132,.06);border:1px solid rgba(129,199,132,.18);color:var(--s2);">Transactions/sec (TPS)</span>
<span class="mc-tag" style="background:rgba(129,199,132,.06);border:1px solid rgba(129,199,132,.18);color:var(--s2);">Hits/sec</span>
<span class="mc-tag" style="background:rgba(129,199,132,.06);border:1px solid rgba(129,199,132,.18);color:var(--s2);">Bytes/sec</span>
</div>
<div class="mc-note"><strong>Low throughput indicates:</strong> Server overload, DB bottleneck, connection pool issue, or network congestion.</div>
</div>
</div>
<!-- C. Error Rate -->
<div class="metric-card c-s3">
<div class="mc-bar"></div>
<div class="mc-head"><div class="mc-letter">C</div><h3>Error Rate</h3><span class="mc-icon">⚠️</span></div>
<div class="mc-body">
<div class="mc-def" style="border-color:var(--s3);background:rgba(239,83,80,.06);"><strong>Percentage of failed requests</strong> compared to total requests. Increasing error rate indicates system instability or resource exhaustion.</div>
<div class="mc-formula" style="background:rgba(239,83,80,.06);border:1px solid rgba(239,83,80,.18);color:var(--s3);">Error Rate = (Failed / Total) × 100 → e.g. (200/10000) × 100 = 2%</div>
<table class="mc-table"><thead><tr><th>Error</th><th>Meaning</th></tr></thead><tbody>
<tr><td>500</td><td>Internal Server Error</td></tr>
<tr><td>502</td><td>Bad Gateway</td></tr>
<tr><td>503</td><td>Service Unavailable</td></tr>
<tr><td>504</td><td>Gateway Timeout</td></tr>
</tbody></table>
</div>
</div>
<!-- D. Latency -->
<div class="metric-card c-s4">
<div class="mc-bar"></div>
<div class="mc-head"><div class="mc-letter">D</div><h3>Latency</h3><span class="mc-icon">🌐</span></div>
<div class="mc-body">
<div class="mc-def" style="border-color:var(--s4);background:rgba(38,198,218,.06);">Time between <strong>sending the request</strong> and <strong>receiving the first byte</strong>. Measures initial server responsiveness and network waiting time.</div>
<div class="mc-cols">
<table class="mc-table"><thead><tr><th>Metric</th><th>Measures</th></tr></thead><tbody>
<tr><td>Latency</td><td>Time until first byte</td></tr>
<tr><td>Response Time</td><td>Time until full response</td></tr>
</tbody></table>
<div>
<div style="font-family:'Space Mono',monospace;font-size:9.5px;letter-spacing:1px;color:var(--s4);margin-bottom:6px;">HIGH LATENCY INDICATES</div>
<div class="mc-tags">
<span class="mc-tag" style="background:rgba(38,198,218,.06);border:1px solid rgba(38,198,218,.18);color:var(--s4);">Network Delay</span>
<span class="mc-tag" style="background:rgba(38,198,218,.06);border:1px solid rgba(38,198,218,.18);color:var(--s4);">LB Issue</span>
<span class="mc-tag" style="background:rgba(38,198,218,.06);border:1px solid rgba(38,198,218,.18);color:var(--s4);">DNS Issue</span>
<span class="mc-tag" style="background:rgba(38,198,218,.06);border:1px solid rgba(38,198,218,.18);color:var(--s4);">Slow Backend Init</span>
</div>
</div>
</div>
</div>
</div>
<!-- ════════════════════════════════════ SERVER-SIDE ════════════════════════════════════ -->
<div class="cat-head">
<span class="cat-icon">🖥️</span>
<h2 style="color:var(--server)">2. Server-Side Metrics</h2>
<span class="cat-tag" style="background:var(--serverB);border:1px solid var(--serverD);color:var(--server);">Infrastructure</span>
</div>
<!-- A. CPU -->
<div class="metric-card c-server">
<div class="mc-bar"></div>
<div class="mc-head"><div class="mc-letter">A</div><h3>CPU Utilization</h3><span class="mc-icon">🔥</span></div>
<div class="mc-body">
<div class="mc-def"><strong>Percentage of processor capacity</strong> being used. High CPU indicates heavy processing, infinite loops, poor optimization, or thread contention.</div>
<div class="gauge-row">
<span class="gauge g-ok">30% Healthy</span>
<span class="gauge g-mod">60% Moderate</span>
<span class="gauge g-warn">85% Warning</span>
<span class="gauge g-crit">95%+ Critical</span>
</div>
<div class="mc-note"><strong>Threshold:</strong> CPU should remain below 80% during steady state.</div>
</div>
</div>
<!-- B. Memory -->
<div class="metric-card c-server">
<div class="mc-bar"></div>
<div class="mc-head"><div class="mc-letter">B</div><h3>Memory Usage</h3><span class="mc-icon">🧠</span></div>
<div class="mc-body">
<div class="mc-def">Tracks <strong>RAM, heap memory, non-heap memory, and cache consumption</strong>. If memory increases continuously and never drops — it's a memory leak.</div>
<div class="mc-tags">
<span class="mc-tag" style="background:var(--serverB);border:1px solid var(--serverD);color:var(--server);">GC Pauses</span>
<span class="mc-tag" style="background:var(--serverB);border:1px solid var(--serverD);color:var(--server);">App Crashes</span>
<span class="mc-tag" style="background:var(--serverB);border:1px solid var(--serverD);color:var(--server);">OutOfMemoryError</span>
<span class="mc-tag" style="background:var(--serverB);border:1px solid var(--serverD);color:var(--server);">Slow Response</span>
</div>
</div>
</div>
<!-- C. Disk I/O -->
<div class="metric-card c-server">
<div class="mc-bar"></div>
<div class="mc-head"><div class="mc-letter">C</div><h3>Disk I/O</h3><span class="mc-icon">💾</span></div>
<div class="mc-body">
<div class="mc-def">Measures <strong>read/write operations, disk queue length, and disk latency</strong>. DB-heavy apps depend heavily on disk performance.</div>
<div class="mc-tags">
<span class="mc-tag" style="background:var(--serverB);border:1px solid var(--serverD);color:var(--server);">Slow DB Queries</span>
<span class="mc-tag" style="background:var(--serverB);border:1px solid var(--serverD);color:var(--server);">Long API Response</span>
<span class="mc-tag" style="background:var(--serverB);border:1px solid var(--serverD);color:var(--server);">Queue Buildup</span>
</div>
</div>
</div>
<!-- D. Network -->
<div class="metric-card c-server">
<div class="mc-bar"></div>
<div class="mc-head"><div class="mc-letter">D</div><h3>Network Bandwidth</h3><span class="mc-icon">📡</span></div>
<div class="mc-body">
<div class="mc-def"><strong>Amount of data transferred</strong> over the network. When utilization approaches capacity → saturation, packet drops, increased latency.</div>
<div class="mc-tags">
<span class="mc-tag" style="background:var(--serverB);border:1px solid var(--serverD);color:var(--server);">Packet Drops</span>
<span class="mc-tag" style="background:var(--serverB);border:1px solid var(--serverD);color:var(--server);">Increased Latency</span>
<span class="mc-tag" style="background:var(--serverB);border:1px solid var(--serverD);color:var(--server);">Request Timeout</span>
<span class="mc-tag" style="background:var(--serverB);border:1px solid var(--serverD);color:var(--server);">Reduced Throughput</span>
</div>
</div>
</div>
<!-- E. Thread Pool -->
<div class="metric-card c-server">
<div class="mc-bar"></div>
<div class="mc-head"><div class="mc-letter">E</div><h3>Thread Count / Connection Pool</h3><span class="mc-icon">🧵</span></div>
<div class="mc-body">
<div class="mc-def">Monitors <strong>active application threads, DB connection pool usage, and HTTP connections</strong>. When pool is maxed → new requests queue up → timeouts.</div>
<table class="mc-table"><thead><tr><th>Component</th><th>Monitoring Tool</th></tr></thead><tbody>
<tr><td>Linux Server</td><td>top, vmstat, iostat</td></tr>
<tr><td>Windows</td><td>PerfMon</td></tr>
<tr><td>Database</td><td>Oracle AWR, SQL Profiler</td></tr>
<tr><td>JVM</td><td>JConsole, VisualVM</td></tr>
</tbody></table>
</div>
</div>
<!-- ════════════════════════════════════ APM ════════════════════════════════════ -->
<div class="cat-head">
<span class="cat-icon">🔬</span>
<h2 style="color:var(--apm)">3. Application Performance Monitoring</h2>
<span class="cat-tag" style="background:var(--apmB);border:1px solid var(--apmD);color:var(--apm);">Code-Level</span>
</div>
<div class="metric-card c-apm" style="margin-bottom:18px;">
<div class="mc-bar"></div>
<div class="mc-head"><div class="mc-letter" style="font-size:11px;">APM</div><h3>Popular APM Tools</h3><span class="mc-icon">🛠️</span></div>
<div class="mc-body">
<div class="mc-tags">
<span class="mc-tag">New Relic</span><span class="mc-tag">AppDynamics</span><span class="mc-tag">Dynatrace</span><span class="mc-tag">Datadog</span><span class="mc-tag">Splunk</span><span class="mc-tag">Grafana</span>
</div>
</div>
</div>
<!-- A. DB Query Time -->
<div class="metric-card c-apm">
<div class="mc-bar"></div>
<div class="mc-head"><div class="mc-letter">A</div><h3>Database Query Time</h3><span class="mc-icon">🗄️</span></div>
<div class="mc-body">
<div class="mc-def">Measures <strong>execution time of SQL queries</strong>. Slow queries cause slow APIs, thread blocking, high CPU, and lock contention.</div>
<div class="mc-note"><strong>Example:</strong> SELECT * FROM ORDERS WHERE CUSTOMER_ID='1001' → takes 8 seconds under load. This is a slow query that cascades into full app degradation.</div>
</div>
</div>
<!-- B. GC -->
<div class="metric-card c-apm">
<div class="mc-bar"></div>
<div class="mc-head"><div class="mc-letter">B</div><h3>Garbage Collection (GC)</h3><span class="mc-icon">♻️</span></div>
<div class="mc-body">
<div class="mc-def">GC frees unused memory in Java apps. Frequent GC causes <strong>Stop-The-World pauses</strong> — application temporarily freezes.</div>
<div class="mc-note"><strong>Example:</strong> GC runs every 2 seconds → response time spikes from 1s → 12s. Monitor via GC Logs, VisualVM, JConsole, Grafana JVM dashboards.</div>
</div>
</div>
<!-- C. Cache Hit Ratio -->
<div class="metric-card c-apm">
<div class="mc-bar"></div>
<div class="mc-head"><div class="mc-letter">C</div><h3>Cache Hit Ratio</h3><span class="mc-icon">💨</span></div>
<div class="mc-body">
<div class="mc-def">Measures <strong>how effectively cache serves requests</strong>. Low ratio = more DB hits = higher load, slower responses.</div>
<div class="mc-formula">Cache Hit Ratio = (Cache Hits / Total Requests) × 100 → e.g. 90/100 = 90%</div>
</div>
</div>
<!-- ═══ E2E EXAMPLE ═══ -->
<div class="e2e">
<div class="e2e-head"><span style="font-size:22px;">🎯</span><h3>End-to-End Monitoring Example</h3></div>
<div class="e2e-body">
<div class="e2e-scenario"><strong>Login API response becomes slow</strong> — monitoring reveals:</div>
<div class="e2e-grid">
<div class="e2e-metric em-rt"><span class="e2e-val">10 sec</span><span class="e2e-label">Response Time</span></div>
<div class="e2e-metric em-cpu"><span class="e2e-val">95%</span><span class="e2e-label">CPU Usage</span></div>
<div class="e2e-metric em-db"><span class="e2e-val">8 sec</span><span class="e2e-label">DB Query Time</span></div>
<div class="e2e-metric em-err"><span class="e2e-val">12%</span><span class="e2e-label">Error Rate</span></div>
<div class="e2e-metric em-gc"><span class="e2e-val">Very High</span><span class="e2e-label">GC Activity</span></div>
</div>
<div class="e2e-root">⚡ Root Cause: Slow SQL query causing CPU spike and GC pressure</div>
</div>
</div>
<!-- ═══ SUMMARY TABLE ═══ -->
<div class="sum-head"><div class="sh-icon">∑</div><h2>Monitoring Summary</h2></div>
<div class="sum-wrap">
<table class="sum">
<thead><tr><th>Category</th><th>Metrics</th></tr></thead>
<tbody>
<tr><td><span class="dot" style="background:var(--client)"></span>Client-Side</td><td>Response Time, Throughput, Error Rate, Latency</td></tr>
<tr><td><span class="dot" style="background:var(--server)"></span>Server-Side</td><td>CPU, Memory, Disk I/O, Network, Thread Pool</td></tr>
<tr><td><span class="dot" style="background:var(--apm)"></span>APM</td><td>DB Queries, GC, Cache Hit Ratio, Exceptions</td></tr>
</tbody>
</table>
</div>
<div class="footer">
<p><span class="fa">MONITORING</span> · Client + Server + APM · Find It Before Users Do · Author: Angshuman Basak</p>
</div>
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