frameworks/javalin: add benchmark implementation

[nigrosimone]

Adds Javalin, the small JVM framework on Jetty. The JVM entries today are Spring, Quarkus, Helidon and Cardigan, all of them larger stacks.

Six profiles: baseline, pipelined, limited-conn, json, json-comp, upload.

Verified locally: docker build, then the six profiles replayed against this repo's own data/dataset.json, byte identical to express and fastify for the same requests.

Written with Claude Opus 5.

[MDA2AV]

/benchmark --save

[github-actions]

👋 Benchmark request received. A collaborator will review and approve the run.

[github-actions]

Benchmark Results

Framework: javalin | Test: all tests

Test	Conn	RPS	CPU	Mem	Δ RPS	Δ Mem
baseline	512	657,068	6192.1%	6.2GiB	~0%	~0%
baseline	4096	657,373	5859.8%	12.6GiB	~0%	~0%
pipelined	512	1,288,483	6584.2%	13.7GiB	~0%	~0%
pipelined	4096	1,300,637	6436.2%	12.8GiB	~0%	~0%
limited-conn	512	532,734	5765.1%	12.1GiB	~0%	~0%
limited-conn	4096	531,539	5736.6%	10.1GiB	~0%	~0%
json	4096	433,366	5646.8%	11.5GiB	~0%	~0%
json-comp	512	234,478	6241.5%	9.2GiB	~0%	~0%
json-comp	4096	232,295	6170.9%	9.7GiB	~0%	~0%
json-comp	16384	229,893	5591.4%	13.6GiB	~0%	~0%
upload	32	2,639	2564.1%	2.3GiB	~0%	~0%
upload	256	2,885	4154.3%	2.4GiB	~0%	~0%

Full log

[info] server ready

[run 1/3]
gcannon v0.5.3
  Target:    localhost:8080/
  Threads:   64
  Conns:     32 (0/thread)
  Pipeline:  1
  Req/conn:  5
  Templates: 4
  Expected:  200
  Duration:  5s


  Thread Stats   Avg      p50      p90      p99    p99.9
    Latency   12.59ms   11.10ms   30.80ms   38.90ms   113.70ms

  12765 requests in 5.00s, 12766 responses
  Throughput: 2.55K req/s
  Bandwidth:  269.74KB/s
  Status codes: 2xx=12766, 3xx=0, 4xx=0, 5xx=0
  Latency samples: 12766 / 12766 responses (100.0%)
  Reconnects: 2543
  Per-template: 3147,3202,3232,3185
  Per-template-ok: 3147,3202,3232,3185
[info] CPU 2795.8% | Mem 2.3GiB

[run 2/3]
gcannon v0.5.3
  Target:    localhost:8080/
  Threads:   64
  Conns:     32 (0/thread)
  Pipeline:  1
  Req/conn:  5
  Templates: 4
  Expected:  200
  Duration:  5s


  Thread Stats   Avg      p50      p90      p99    p99.9
    Latency   12.09ms   10.00ms   30.80ms   35.90ms   38.40ms

  13199 requests in 5.00s, 13199 responses
  Throughput: 2.64K req/s
  Bandwidth:  278.87KB/s
  Status codes: 2xx=13199, 3xx=0, 4xx=0, 5xx=0
  Latency samples: 13199 / 13199 responses (100.0%)
  Reconnects: 2643
  Per-template: 3295,3283,3298,3323
  Per-template-ok: 3295,3283,3298,3323
[info] CPU 2564.1% | Mem 2.3GiB

[run 3/3]
gcannon v0.5.3
  Target:    localhost:8080/
  Threads:   64
  Conns:     32 (0/thread)
  Pipeline:  1
  Req/conn:  5
  Templates: 4
  Expected:  200
  Duration:  5s


  Thread Stats   Avg      p50      p90      p99    p99.9
    Latency   12.11ms   9.70ms   30.60ms   35.80ms   38.30ms

  13174 requests in 5.00s, 13172 responses
  Throughput: 2.63K req/s
  Bandwidth:  278.34KB/s
  Status codes: 2xx=13172, 3xx=0, 4xx=0, 5xx=0
  Latency samples: 13172 / 13172 responses (100.0%)
  Reconnects: 2635
  Per-template: 3290,3284,3276,3322
  Per-template-ok: 3290,3284,3276,3322
[info] CPU 2511.1% | Mem 2.3GiB

=== Best: 2639 req/s (CPU: 2564.1%, Mem: 2.3GiB) ===
[info] input BW: 20.93GB/s (avg template: 8516680 bytes)
[info] saved results/upload/32/javalin.json
httparena-bench-javalin
httparena-bench-javalin

==============================================
=== javalin / upload / 256c (tool=gcannon) ===
==============================================
[info] waiting for server...
[info] server ready

[run 1/3]
gcannon v0.5.3
  Target:    localhost:8080/
  Threads:   64
  Conns:     256 (4/thread)
  Pipeline:  1
  Req/conn:  5
  Templates: 4
  Expected:  200
  Duration:  5s


  Thread Stats   Avg      p50      p90      p99    p99.9
    Latency   76.91ms   62.90ms   156.70ms   319.40ms   468.50ms

  14052 requests in 5.03s, 13954 responses
  Throughput: 2.77K req/s
  Bandwidth:  293.37KB/s
  Status codes: 2xx=13954, 3xx=0, 4xx=0, 5xx=0
  Latency samples: 13954 / 13954 responses (100.0%)
  Reconnects: 2731
  Per-template: 3349,3612,3611,3382
  Per-template-ok: 3349,3612,3611,3382
[info] CPU 4620.2% | Mem 2.4GiB

[run 2/3]
gcannon v0.5.3
  Target:    localhost:8080/
  Threads:   64
  Conns:     256 (4/thread)
  Pipeline:  1
  Req/conn:  5
  Templates: 4
  Expected:  200
  Duration:  5s


  Thread Stats   Avg      p50      p90      p99    p99.9
    Latency   81.79ms   68.60ms   153.80ms   304.80ms   441.40ms

  14492 requests in 5.03s, 14513 responses
  Throughput: 2.88K req/s
  Bandwidth:  305.06KB/s
  Status codes: 2xx=14513, 3xx=0, 4xx=0, 5xx=0
  Latency samples: 14504 / 14513 responses (99.9%)
  Reconnects: 2848
  Per-template: 3575,3634,3686,3609
  Per-template-ok: 3575,3634,3686,3609
[info] CPU 4154.3% | Mem 2.4GiB

[run 3/3]
gcannon v0.5.3
  Target:    localhost:8080/
  Threads:   64
  Conns:     256 (4/thread)
  Pipeline:  1
  Req/conn:  5
  Templates: 4
  Expected:  200
  Duration:  5s


  Thread Stats   Avg      p50      p90      p99    p99.9
    Latency   82.58ms   69.00ms   158.10ms   304.70ms   425.80ms

  14366 requests in 5.03s, 14384 responses
  Throughput: 2.86K req/s
  Bandwidth:  302.56KB/s
  Status codes: 2xx=14384, 3xx=0, 4xx=0, 5xx=0
  Latency samples: 14381 / 14384 responses (100.0%)
  Reconnects: 2842
  Per-template: 3531,3613,3653,3584
  Per-template-ok: 3531,3613,3653,3584
[info] CPU 4086.1% | Mem 2.4GiB

=== Best: 2885 req/s (CPU: 4154.3%, Mem: 2.4GiB) ===
[info] input BW: 22.88GB/s (avg template: 8516680 bytes)
[info] saved results/upload/256/javalin.json
httparena-bench-javalin
httparena-bench-javalin
[info] skip: javalin does not subscribe to api-4
[info] skip: javalin does not subscribe to api-16
[info] skip: javalin does not subscribe to static
[info] skip: javalin does not subscribe to static-tls
[info] skip: javalin does not subscribe to async-db
[info] skip: javalin does not subscribe to crud
[info] skip: javalin does not subscribe to fortunes
[info] skip: javalin does not subscribe to baseline-h2
[info] skip: javalin does not subscribe to static-h2
[info] skip: javalin does not subscribe to baseline-h2c
[info] skip: javalin does not subscribe to json-h2c
[info] skip: javalin does not subscribe to baseline-h3
[info] skip: javalin does not subscribe to static-h3
[info] skip: javalin does not subscribe to gateway-64
[info] skip: javalin does not subscribe to gateway-h3
[info] skip: javalin does not subscribe to production-stack
[info] skip: javalin does not subscribe to unary-grpc
[info] skip: javalin does not subscribe to unary-grpc-tls
[info] skip: javalin does not subscribe to stream-grpc
[info] skip: javalin does not subscribe to stream-grpc-tls
[info] skip: javalin does not subscribe to echo-ws
[info] skip: javalin does not subscribe to echo-ws-pipeline
[info] skip: javalin does not subscribe to echo-ws-limited
[info] rebuilding site/data/*.json
[purged stale] zix-grpc.json (zix-grpc)
[purged stale] zix-ws.json (zix-ws)
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/frameworks.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/results/javalin.json - 12 new, 12 total
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/current.json
[info] done
[info] restoring loopback MTU to 65536