[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"academy-blogs-en-1-1-all-go-websocket-k6-load-testing-performance-tuning-all--*":3,"academy-blog-translations-xpb7i33hs27leyi":80},{"data":4,"page":67,"perPage":67,"totalItems":67,"totalPages":67},[5],{"alt":6,"collectionId":7,"collectionName":8,"content":9,"cover_image":10,"cover_image_path":11,"created":12,"created_by":13,"expand":14,"id":75,"keywords":76,"locale":49,"published_at":77,"scheduled_at":13,"school_blog":71,"short_description":78,"status":69,"title":6,"updated":79,"updated_by":13,"slug":72,"views":74},"Golang The Series EP 134: Load & Stress Testing WebSockets with k6","sclblg987654321","school_blog_translations","\u003Cp style=\"line-height:1.38;margin-bottom:12pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">Welcome back, Gophers! Many developers confidently claim, \"My code is well-written; it will scale effortlessly.\" However, in production, WebSocket servers often reveal strange behaviors under heavy traffic—\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Memory Leaks\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">, \u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>File Descriptor exhaustion\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">, or \u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Goroutine stalemates\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> that can bring your entire system to a halt.\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\u003Cp style=\"line-height:1.38;margin-bottom:12pt;margin-top:0pt;\" dir=\"ltr\"> \u003C\u002Fp>\u003Cp style=\"line-height:1.38;margin-bottom:12pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">Today, we step into the role of the \"Destroyer\" to prove whether the systems we’ve built since EP 1 are truly resilient or if they will crumble under the weight of a traffic storm.\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\u003Cp style=\"line-height:1.38;margin-bottom:0pt;margin-top:0pt;\" dir=\"ltr\"> \u003C\u002Fp>\u003Ch2>\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>1. Load, Stress, and Soak Testing: What’s the Difference?\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fh2>\u003Cp> \u003C\u002Fp>\u003Cp style=\"line-height:1.38;margin-bottom:12pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">Before we start \"attacking\" our system, we must define our objectives clearly:\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\u003Cp style=\"line-height:1.38;margin-bottom:12pt;margin-top:0pt;\" dir=\"ltr\"> \u003C\u002Fp>\u003Cdiv style=\"margin-left:0pt;\" dir=\"ltr\" align=\"left\">\u003Cfigure class=\"table\" style=\"width:82.24%;\">\u003Ctable class=\"ck-table-resized\" style=\"border-collapse:collapse;border-style:none;\">\u003Ccolgroup>\u003Ccol style=\"width:21.82%;\" width=\"96\">\u003Ccol style=\"width:40.51%;\" width=\"224\">\u003Ccol style=\"width:37.67%;\" width=\"304\">\u003C\u002Fcolgroup>\u003Ctbody>\u003Ctr style=\"height:26.5pt;\">\u003Ctd style=\"border-color:#000000;border-width:0.75pt;overflow-wrap:break-word;overflow:hidden;padding:5pt;vertical-align:top;\">\u003Cp style=\"line-height:1.38;margin-bottom:24pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Test Type\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\u003C\u002Ftd>\u003Ctd style=\"border-color:#000000;border-width:0.75pt;overflow-wrap:break-word;overflow:hidden;padding:5pt;vertical-align:top;\">\u003Cp style=\"line-height:1.38;margin-bottom:24pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Definition\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\u003C\u002Ftd>\u003Ctd style=\"border-color:#000000;border-width:0.75pt;overflow-wrap:break-word;overflow:hidden;padding:5pt;vertical-align:top;\">\u003Cp style=\"line-height:1.38;margin-bottom:24pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Objective\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr style=\"height:40.75pt;\">\u003Ctd style=\"border-color:#000000;border-width:0.75pt;overflow-wrap:break-word;overflow:hidden;padding:5pt;vertical-align:top;\">\u003Cp style=\"line-height:1.38;margin-bottom:24pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Load Testing\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\u003C\u002Ftd>\u003Ctd style=\"border-color:#000000;border-width:0.75pt;overflow-wrap:break-word;overflow:hidden;padding:5pt;vertical-align:top;\">\u003Cp style=\"line-height:1.38;margin-bottom:24pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">Testing under expected traffic targets.\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\u003C\u002Ftd>\u003Ctd style=\"border-color:#000000;border-width:0.75pt;overflow-wrap:break-word;overflow:hidden;padding:5pt;vertical-align:top;\">\u003Cp style=\"line-height:1.38;margin-bottom:24pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">Does the system meet the SLA (Latency\u002FThroughput)?\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr style=\"height:40.75pt;\">\u003Ctd style=\"border-color:#000000;border-width:0.75pt;overflow-wrap:break-word;overflow:hidden;padding:5pt;vertical-align:top;\">\u003Cp style=\"line-height:1.38;margin-bottom:24pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Stress Testing\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\u003C\u002Ftd>\u003Ctd style=\"border-color:#000000;border-width:0.75pt;overflow-wrap:break-word;overflow:hidden;padding:5pt;vertical-align:top;\">\u003Cp style=\"line-height:1.38;margin-bottom:24pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">Pushing the system until it breaks.\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\u003C\u002Ftd>\u003Ctd style=\"border-color:#000000;border-width:0.75pt;overflow-wrap:break-word;overflow:hidden;padding:5pt;vertical-align:top;\">\u003Cp style=\"line-height:1.38;margin-bottom:24pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">Where is the \u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Breaking Point\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">? Which component fails first?\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr style=\"height:40.75pt;\">\u003Ctd style=\"border-color:#000000;border-width:0.75pt;overflow-wrap:break-word;overflow:hidden;padding:5pt;vertical-align:top;\">\u003Cp style=\"line-height:1.38;margin-bottom:24pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Soak Testing\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\u003C\u002Ftd>\u003Ctd style=\"border-color:#000000;border-width:0.75pt;overflow-wrap:break-word;overflow:hidden;padding:5pt;vertical-align:top;\">\u003Cp style=\"line-height:1.38;margin-bottom:24pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">Running a steady load for a long duration (e.g., 24h).\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\u003C\u002Ftd>\u003Ctd style=\"border-color:#000000;border-width:0.75pt;overflow-wrap:break-word;overflow:hidden;padding:5pt;vertical-align:top;\">\u003Cp style=\"line-height:1.38;margin-bottom:24pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">Are there long-term \u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Memory Leaks\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> or resource accumulation?\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\u003C\u002Ftd>\u003C\u002Ftr>\u003C\u002Ftbody>\u003C\u002Ftable>\u003C\u002Ffigure>\u003C\u002Fdiv>\u003Cp style=\"line-height:1.38;margin-bottom:0pt;margin-top:0pt;\" dir=\"ltr\"> \u003C\u002Fp>\u003Ch2>\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>2. Instrumenting Your Go Server for Testing\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fh2>\u003Cp> \u003C\u002Fp>\u003Cp style=\"line-height:1.38;margin-bottom:12pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">To effectively test, we must be able to \"see\" the internal state of the server while it is under fire. We use the \u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"background-color:transparent;color:#188038;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">runtime\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> package and \u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"background-color:transparent;color:#188038;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">prometheus\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> to track health metrics.\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\u003Cp style=\"line-height:1.38;margin-bottom:12pt;margin-top:0pt;\" dir=\"ltr\"> \u003C\u002Fp>\u003Ch3>\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Go Code: Instrumentation & Resource Awareness\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fh3>\u003Cp> \u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-plaintext\">Go\npackage main\n\nimport (\n\t\"log\"\n\t\"net\u002Fhttp\"\n\t\"runtime\"\n\t\"syscall\"\n\n\t\"github.com\u002Fprometheus\u002Fclient_golang\u002Fprometheus\"\n\t\"github.com\u002Fprometheus\u002Fclient_golang\u002Fprometheus\u002Fpromauto\"\n\t\"github.com\u002Fprometheus\u002Fclient_golang\u002Fprometheus\u002Fpromhttp\"\n)\n\nvar (\n\t\u002F\u002F Track the actual number of running Goroutines\n\tgoroutineGauge = promauto.NewGauge(prometheus.GaugeOpts{\n\t\tName: \"current_goroutines_count\",\n\t\tHelp: \"The total number of currently active goroutines\",\n\t})\n)\n\nfunc main() {\n\t\u002F\u002F 1. Check System Limits (File Descriptors)\n\tvar rLimit syscall.Rlimit\n\tif err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rLimit); err == nil {\n\t\tlog.Printf(\"System-level File Descriptor Limit: %d\", rLimit.Cur)\n\t}\n\n\t\u002F\u002F 2. Expose Metrics for Prometheus\u002FGrafana (Port 2112)\n\tgo func() {\n\t\thttp.Handle(\"\u002Fmetrics\", promhttp.Handler())\n\t\tlog.Println(\"Metrics endpoint available on :2112\u002Fmetrics\")\n\t\thttp.ListenAndServe(\":2112\", nil)\n\t}()\n\n\t\u002F\u002F 3. Monitor Goroutine count in the background\n\tgo func() {\n\t\tfor {\n\t\t\tgoroutineGauge.Set(float64(runtime.NumGoroutine()))\n\t\t}\n\t}()\n\n\t\u002F\u002F Your WebSocket Server Logic goes here...\n}\u003C\u002Fcode>\u003C\u002Fpre>\u003Cp> \u003C\u002Fp>\u003Ch2>\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>3. Designing the Attack: Scripting with k6\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fh2>\u003Cp> \u003C\u002Fp>\u003Cp style=\"line-height:1.38;margin-bottom:12pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">For WebSocket testing, we recommend \u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>k6\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> (by Grafana). It uses a Go-powered engine but allows you to script scenarios in JavaScript, making it incredibly flexible.\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\u003Cp style=\"line-height:1.38;margin-bottom:12pt;margin-top:0pt;\" dir=\"ltr\"> \u003C\u002Fp>\u003Ch3>\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>k6 Script Example (JavaScript):\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fh3>\u003Cp> \u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-plaintext\">JavaScript\nimport ws from 'k6\u002Fws';\nimport { check, sleep } from 'k6';\n\nexport const options = {\n  stages: [\n    { duration: '1m', target: 5000 },  \u002F\u002F Ramping up: 0 to 5,000 users in 1 min\n    { duration: '3m', target: 5000 },  \u002F\u002F Sustained: Hold at 5,000 users\n    { duration: '1m', target: 0 },     \u002F\u002F Ramping down: Gradually release\n  ],\n};\n\nexport default function () {\n  const url = 'ws:\u002F\u002Flocalhost:8080\u002Fws';\n  \n  const res = ws.connect(url, null, function (socket) {\n    socket.on('open', () => {\n      \u002F\u002F Simulate sending a heartbeat or chat every 10 seconds\n      socket.setInterval(() => {\n        socket.send(JSON.stringify({ type: 'ping', payload: 'Gopher-Check' }));\n      }, 10000);\n    });\n\n    socket.on('message', (data) => {\n      \u002F\u002F Verify that the server responds correctly\n      check(data, { 'message received': (d) => d.length > 0 });\n    });\n\n    \u002F\u002F Simulate user session duration (Stay for 60 seconds)\n    socket.setTimeout(() => {\n      socket.close();\n    }, 60000);\n  });\n\n  check(res, { 'status is 101 (Switching Protocols)': (r) => r && r.status === 101 });\n}\u003C\u002Fcode>\u003C\u002Fpre>\u003Cp> \u003C\u002Fp>\u003Ch2>\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>4. Key Metrics to Watch\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fh2>\u003Cp> \u003C\u002Fp>\u003Cp style=\"line-height:1.38;margin-bottom:12pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">While k6 is bombarding your system, keep your eyes on your Prometheus Dashboard:\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\u003Col style=\"margin-bottom:0;margin-top:0;padding-inline-start:48px;\">\u003Cli style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;font-size:11pt;font-style:normal;font-variant:normal;font-weight:400;list-style-type:decimal;text-decoration:none;vertical-align:baseline;white-space:pre;\" dir=\"ltr\" aria-level=\"1\">\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Goroutine Count:\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> If users disconnect but the Goroutine count stays high, you have a \u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Goroutine Leak\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> (usually caused by unclosed channels or infinite loops).\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fli>\u003Cli style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;font-size:11pt;font-style:normal;font-variant:normal;font-weight:400;list-style-type:decimal;text-decoration:none;vertical-align:baseline;white-space:pre;\" dir=\"ltr\" aria-level=\"1\">\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>RSS (Resident Set Size):\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> If memory usage keeps climbing and never settles, you have a \u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Memory Leak\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">.\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fli>\u003Cli style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;font-size:11pt;font-style:normal;font-variant:normal;font-weight:400;list-style-type:decimal;text-decoration:none;vertical-align:baseline;white-space:pre;\" dir=\"ltr\" aria-level=\"1\">\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Handshake Error Rate:\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> High error rates during the 101 Switching Protocols phase indicate that your Load Balancer or Handshake logic is overwhelmed.\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fli>\u003Cli style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;font-size:11pt;font-style:normal;font-variant:normal;font-weight:400;list-style-type:decimal;text-decoration:none;vertical-align:baseline;white-space:pre;\" dir=\"ltr\" aria-level=\"1\">\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>File Descriptors:\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> Monitor \u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"background-color:transparent;color:#188038;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">process_open_fds\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">. If it hits the OS limit (\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"background-color:transparent;color:#188038;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">ulimit\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">), new connections will be rejected immediately.\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fli>\u003C\u002Fol>\u003Cp style=\"line-height:1.38;margin-bottom:0pt;margin-top:0pt;\" dir=\"ltr\"> \u003C\u002Fp>\u003Ch2>\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>5. Tuning Your System for High Concurrency\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fh2>\u003Cp> \u003C\u002Fp>\u003Cp style=\"line-height:1.38;margin-bottom:12pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">If your system breaks at 5,000 connections and you need to reach 100,000:\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\u003Cul style=\"margin-bottom:0;margin-top:0;padding-inline-start:48px;\">\u003Cli style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;font-size:11pt;font-style:normal;font-variant:normal;font-weight:400;list-style-type:disc;text-decoration:none;vertical-align:baseline;white-space:pre;\" dir=\"ltr\" aria-level=\"1\">\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Adjust \u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"background-color:transparent;color:#188038;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>ulimit\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>:\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> In Linux, 1 WebSocket = 1 File. If your limit is set to 1,024, the 1,025th user will fail. Increase it to 100,000+ in \u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"background-color:transparent;color:#188038;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u002Fetc\u002Fsecurity\u002Flimits.conf\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">.\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fli>\u003Cli style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;font-size:11pt;font-style:normal;font-variant:normal;font-weight:400;list-style-type:disc;text-decoration:none;vertical-align:baseline;white-space:pre;\" dir=\"ltr\" aria-level=\"1\">\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Buffer Management:\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> Ensure you are using \u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"background-color:transparent;color:#188038;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">sync.Pool\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> (from \u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>EP 132\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">) to reuse memory buffers during message processing to reduce GC pressure.\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fli>\u003Cli style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;font-size:11pt;font-style:normal;font-variant:normal;font-weight:400;list-style-type:disc;text-decoration:none;vertical-align:baseline;white-space:pre;\" dir=\"ltr\" aria-level=\"1\">\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>TCP Tuning:\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> Adjust \u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"background-color:transparent;color:#188038;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">tcp_fin_timeout\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> and \u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"background-color:transparent;color:#188038;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">tcp_tw_reuse\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> at the OS level to recycle sockets faster.\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fli>\u003C\u002Ful>\u003Cp> \u003C\u002Fp>\u003Chr>\u003Cp> \u003C\u002Fp>\u003Ch2>\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Summary\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fh2>\u003Cp> \u003C\u002Fp>\u003Cp style=\"line-height:1.38;margin-bottom:12pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Load & Stress Testing\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> isn't just about finding out \"how much it can take.\" It's about building \u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>confidence\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">. When that massive traffic spike hits in the middle of the night, you will stand firm, knowing exactly how your system will behave and having a failover plan already in place.\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\u003Cp style=\"line-height:1.38;margin-bottom:12pt;margin-top:0pt;\" dir=\"ltr\"> \u003C\u002Fp>\u003Cp style=\"line-height:1.38;margin-bottom:12pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#000000;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>In the Next Episode (EP 135):\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> We will integrate this battle-tested system into a \u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Continuous Deployment & CI\u002FCD Pipeline\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">, ensuring that every update is delivered automatically and safely. 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