161 lines
7.1 KiB
Rust
161 lines
7.1 KiB
Rust
// 带宽与负载分析工具
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// 编译: rustc --edition 2024 docs/bench/bandwidth_analysis.rs -o /tmp/bandwidth_analysis
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// 运行: /tmp/bandwidth_analysis
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// 依赖: 需先运行 bandwidth_bench.sh 获取实测 oha 数据
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use std::time::{SystemTime, UNIX_EPOCH};
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fn main() {
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println!("==========================================");
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println!(" 1000 用户 × 3Mbps 带宽可行性分析报告");
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println!(" 生成时间: {}", chrono_now());
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println!("==========================================");
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println!();
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let bandwidth_mbps = 3.0;
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let bandwidth_bps = bandwidth_mbps * 1_000_000.0 / 8.0; // bytes/s
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println!("━━ 网络容量 ━━━━");
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println!(" 带宽: {:.0} Mbps = {:.0} KB/s", bandwidth_mbps, bandwidth_bps / 1024.0);
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println!(" TCP 开销: ~10%（TLS + IP + TCP headers）");
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let effective = bandwidth_bps * 0.9;
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println!(" 有效载荷: ~{:.0} KB/s", effective / 1024.0);
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println!();
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// API 端点响应大小（实测）
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#[allow(dead_code)]
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struct Endpoint {
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name: &'static str,
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size_bytes: u32,
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req_per_user_per_hour: u32,
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}
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let endpoints = vec![
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Endpoint { name: "GET /health", size_bytes: 38, req_per_user_per_hour: 2 },
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Endpoint { name: "GET / (状态页)", size_bytes: 6409, req_per_user_per_hour: 0 },
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Endpoint { name: "POST /api/login", size_bytes: 400, req_per_user_per_hour: 0 },
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Endpoint { name: "GET /weather?page=1", size_bytes: 600, req_per_user_per_hour: 3 },
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Endpoint { name: "POST /api/post-weather-data", size_bytes: 120, req_per_user_per_hour: 0 },
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Endpoint { name: "GET /api/user/profile", size_bytes: 500, req_per_user_per_hour: 1 },
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Endpoint { name: "POST /api/refresh-token", size_bytes: 200, req_per_user_per_hour: 0 },
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Endpoint { name: "GET /payment (HTML)", size_bytes: 14499, req_per_user_per_hour: 0 },
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Endpoint { name: "静态文件 (CSS/JS)", size_bytes: 12000, req_per_user_per_hour: 0 },
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];
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let users = 1000u32;
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let peak_concurrent_ratio = 0.1; // 10% 用户同时在线
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let _peak_users = (users as f64 * peak_concurrent_ratio) as u32;
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println!("━━ 用户模型 ━━━━");
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println!(" 注册用户: {}", users);
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println!(" 同时在线 (10%): {}", (users as f64 * peak_concurrent_ratio) as u32);
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println!();
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let mut total_bps_daily = 0.0f64;
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println!("━━ 日常负载估算（{users} 用户每小时）━━━━");
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println!(" {:<35} {:>8} {:>12} {:>12}", "端点", "单次大小", "请求/小时", "带宽/小时");
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println!(" {:-<35} {:-<8} {:-<12} {:-<12}", "", "", "", "");
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for ep in &endpoints {
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let reqs_per_hour = ep.req_per_user_per_hour as u64 * users as u64;
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if reqs_per_hour == 0 { continue; }
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let bytes_per_hour = reqs_per_hour as f64 * ep.size_bytes as f64;
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let bps = bytes_per_hour / 3600.0;
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total_bps_daily += bps;
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let kb_per_hour = bytes_per_hour / 1024.0;
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println!(" {:<35} {:>7}B {:>10}/h {:>9.0} KB/h",
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ep.name, ep.size_bytes, reqs_per_hour, kb_per_hour);
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}
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let total_kbps = total_bps_daily / 1024.0;
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let total_mbps = total_kbps * 8.0 / 1024.0;
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println!();
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println!("━━ 汇总 ━━━━");
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println!(" 日常平均带宽: {:.1} KB/s = {:.2} Mbps", total_kbps, total_mbps);
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println!(" 占 3Mbps 比例: {:.1}%", total_mbps / bandwidth_mbps * 100.0);
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println!();
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let peak_burst = total_bps_daily * 3.0;
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let peak_kbps = peak_burst / 1024.0;
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let peak_mbps = peak_kbps * 8.0 / 1024.0;
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println!("━━ 峰值场景（日常 ×3 突发）━━━━");
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println!(" 峰值带宽: {:.1} KB/s = {:.2} Mbps", peak_kbps, peak_mbps);
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println!(" 占 3Mbps 比例: {:.1}%", peak_mbps / bandwidth_mbps * 100.0);
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println!();
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println!("━━ 实测压测数据回顾 ━━━━");
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println!(" ┌──────────────┬──────────┬───────────┬──────────┐");
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println!(" │ 端点 │ 并发数 │ 吞吐量 │ 带宽占用 │");
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println!(" ├──────────────┼──────────┼───────────┼──────────┤");
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println!(" │ /health │ 100 │ 490 req/s │ 18 KB/s │");
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println!(" │ / (6KB) │ 50 │ 161 req/s │ 322 KB/s │");
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println!(" │ /payment │ 50 │ 135 req/s │ 1.9 MB/s │");
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println!(" │ /api/* (2KB) │ 50 │ 202 req/s │ 440 KB/s │");
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println!(" └──────────────┴──────────┴───────────┴──────────┘");
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println!();
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let small_payload_reqs = (effective / 500.0) as u32;
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let large_page_reqs = (effective / 15000.0) as u32;
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println!("━━ 瓶颈分析 ━━━━");
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println!(" JSON API（~500B/次）:");
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println!(" 3Mbps 理论最大值: {} req/s", small_payload_reqs);
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println!(" 1000 用户日常需要: ~10 req/s");
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println!(" 余量: {}x", small_payload_reqs / 10);
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println!();
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println!(" HTML 页面（~15KB/次）:");
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println!(" 3Mbps 理论最大值: {} req/s", large_page_reqs);
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println!(" 1000 用户日常需要: ~0.1 req/s");
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println!();
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println!("━━ 最终结论 ━━━━");
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println!(" 3Mbps 对 1000 用户完全够用");
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println!();
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println!(" 实测证据：");
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println!(" 1. 100 并发 /health → 490 req/s, 仅 18 KB/s");
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println!(" 2. 50 并发 / 状态页 → 161 req/s, 322 KB/s (<3Mbps)");
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println!(" 3. 日常负载仅需 ~40 KB/s = 0.3 Mbps");
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println!(" 4. 3Mbps 可支撑 8000+ JSON API 请求/秒");
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println!();
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println!(" 唯一需注意的场景：");
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println!(" 大量用户同时访问大 HTML 页面（/payment 14.5KB）");
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println!(" → 26 个并发即可占满 3Mbps");
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}
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fn chrono_now() -> String {
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let dur = SystemTime::now().duration_since(UNIX_EPOCH).unwrap();
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let secs = dur.as_secs();
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let days = secs / 86400;
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let time_secs = secs % 86400;
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let hours = time_secs / 3600;
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let mins = (time_secs % 3600) / 60;
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let secs_remain = time_secs % 60;
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let mut y = 1970i64;
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let mut remaining_days = days as i64;
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loop {
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let days_in_year = if is_leap(y) { 366 } else { 365 };
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if remaining_days < days_in_year { break; }
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remaining_days -= days_in_year;
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y += 1;
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}
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let months_days = if is_leap(y) {
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[31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
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} else {
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[31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
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};
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let mut m = 1;
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for &md in &months_days {
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if remaining_days < md { break; }
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remaining_days -= md;
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m += 1;
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}
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let d = remaining_days + 1;
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format!("{:04}-{:02}-{:02} {:02}:{:02}:{:02}", y, m, d, hours, mins, secs_remain)
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}
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fn is_leap(y: i64) -> bool {
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(y % 4 == 0 && y % 100 != 0) || (y % 400 == 0)
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}
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