bench25.md

Benchmark: Spring WebFlux vs Spring MVC

Konfigurasi Test

Load Pattern:

• Ramp up: 15s → 50 users
• Hold: 30s → 100 users
• Peak: 15s → 150 users
• Ramp down: 30s → 0 users
• Total: ~90 detik per service

Database: PostgreSQL (shared, test sequential untuk menghindari kompetisi resource)

Tool: K6 Load Testing

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Hasil Benchmark

🟢 Spring WebFlux

Metric	Value
Throughput	9,415 req/s
Total Requests	847,365
Error Rate	0.00%
Avg Latency	7.46ms
Median (p50)	7.25ms
p90	12.9ms
p95	14.05ms
Max	93.1ms

Detail:

http_req_duration: avg=7.46ms  min=444µs  med=7.25ms  max=93.1ms
  - Waiting:   7.44ms
  - Receiving: 12.51µs
  - Sending:   4.17µs
  - Blocked:   941ns

🔵 Spring MVC

Metric	Value
Throughput	5,144 req/s
Total Requests	462,981
Error Rate	0.00%
Avg Latency	13.69ms
Median (p50)	11.99ms
p90	26.28ms
p95	32.42ms
Max	289.5ms

Detail:

http_req_duration: avg=13.69ms  min=510µs  med=11.99ms  max=289.5ms
  - Waiting:   13.63ms
  - Receiving: 49.04µs
  - Sending:   5.82µs
  - Blocked:   3.08µs

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Perbandingan

Metric	WebFlux	Spring MVC	Selisih
Throughput	9,415 req/s	5,144 req/s	+83% ✅
Avg Latency	7.46ms	13.69ms	-45% ✅
p50	7.25ms	11.99ms	-40% ✅
p90	12.9ms	26.28ms	-51% ✅
p95	14.05ms	32.42ms	-57% ✅
Max	93.1ms	289.5ms	-68% ✅
Total Requests	847,365	462,981	+83% ✅
Error Rate	0.00%	0.00%	sama

Visualisasi:

Throughput (req/s)
━━━━━━━━━━━━━━━━━━━━
WebFlux  ████████████████████ 9,415
MVC      ███████████           5,144

Latency p95 (ms)
━━━━━━━━━━━━━━━━━━━━
WebFlux  ████                  14.05
MVC      ██████████            32.42

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Tech Stack

Spring WebFlux (Port 8080)

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>4.0.0-SNAPSHOT</version>
</parent>

<properties>
    <java.version>25</java.version>
</properties>

<dependencies>
    <!-- Reactive Web -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-webflux</artifactId>
    </dependency>
    
    <!-- Reactive Database -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-r2dbc</artifactId>
    </dependency>
    
    <!-- PostgreSQL R2DBC Driver -->
    <dependency>
        <groupId>org.postgresql</groupId>
        <artifactId>r2dbc-postgresql</artifactId>
        <scope>runtime</scope>
    </dependency>
    
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </dependency>
</dependencies>

Spring MVC (Port 8081)

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>4.0.0-SNAPSHOT</version>
</parent>

<properties>
    <java.version>25</java.version>
</properties>

<dependencies>
    <!-- Traditional Web -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    
    <!-- Traditional Database -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    
    <!-- PostgreSQL JDBC Driver -->
    <dependency>
        <groupId>org.postgresql</groupId>
        <artifactId>postgresql</artifactId>
        <scope>runtime</scope>
    </dependency>
    
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </dependency>
</dependencies>

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Kesimpulan

Pemenang: Spring WebFlux

• 83% lebih cepat dalam throughput
• 45-57% lebih rendah dalam latency (semua percentile)
• Lebih stabil di bawah tekanan (max latency 3x lebih baik)
• Cocok untuk high concurrency (100+ concurrent users)

Spring MVC tetap viable untuk:

• Aplikasi sederhana dengan concurrency rendah
• Tim yang belum familiar dengan reactive programming
• Aplikasi dengan blocking library yang tidak punya reactive driver