[rails] Let Rails enable YJIT by p8 · Pull Request #704 · MDA2AV/HttpArena

p8 · 2026-05-12T14:02:15Z

This makes sure no methods get jitted that are only used for startup.

p8 · 2026-05-12T14:02:42Z

/benchmark -f rails

github-actions · 2026-05-12T14:02:59Z

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

github-actions · 2026-05-12T14:42:11Z

Benchmark Results

Framework: rails | Test: all tests

Test	Conn	RPS	CPU	Mem	Δ RPS	Δ Mem
baseline	512	78,626	5594.0%	6.6GiB	+31.8%	+1.5%
baseline	4096	34,495	5081.8%	6.6GiB	+10.6%	+6.5%
pipelined	512	309,711	6465.2%	2.2GiB	-1.6%	-12.0%
pipelined	4096	301,536	6508.8%	2.2GiB	-3.9%	-15.4%
limited-conn	512	27,753	4578.1%	5.0GiB	~0%	-16.7%
limited-conn	4096	27,688	4685.5%	5.6GiB	~0%	-8.2%
json	4096	119,450	6394.9%	3.6GiB	-2.6%	-18.2%
json-comp	512	78,613	6400.5%	3.1GiB	-7.1%	-22.5%
json-comp	4096	82,045	6382.3%	4.4GiB	-2.5%	+7.3%
json-comp	16384	82,540	6255.9%	4.2GiB	-0.2%	-2.3%
json-tls	4096	111,256	6452.0%	4.3GiB	-5.2%	-20.4%
upload	32	937	2999.4%	11.2GiB	+0.4%	+2.8%
upload	256	905	6321.2%	8.5GiB	+0.9%	+18.1%
api-4	256	9,946	393.8%	314MiB	-2.0%	-17.6%
api-16	1024	24,409	1739.9%	907MiB	-5.9%	-19.5%
static	1024	125,568	6513.9%	6.1GiB	+5.4%	-14.1%
static	4096	119,296	6487.5%	5.9GiB	-0.6%	-34.4%
static	6800	121,783	6452.7%	5.9GiB	~0%	-37.2%
async-db	1024	68,404	6391.5%	2.9GiB	+0.5%	-3.3%

Full log

[run 2/3]
Running 5s test @ http://localhost:8080
  64 threads and 4096 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency    32.86ms    9.55ms 274.85ms   84.11%
    Req/Sec     1.87k   455.46     8.39k    83.06%
  607867 requests in 5.10s, 9.32GB read
Requests/sec: 119102.03
Transfer/sec:      1.83GB
[info] CPU 6498.1% | Mem 5.9GiB

[run 3/3]
Running 5s test @ http://localhost:8080
  64 threads and 4096 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency    32.61ms    9.32ms 251.66ms   82.41%
    Req/Sec     1.88k   479.77    10.76k    80.56%
  608494 requests in 5.10s, 9.33GB read
Requests/sec: 119296.90
Transfer/sec:      1.83GB
[info] CPU 6487.5% | Mem 5.9GiB

=== Best: 119296 req/s (CPU: 6487.5%, Mem: 5.9GiB) ===
[info] saved results/static/4096/rails.json
httparena-bench-rails
httparena-bench-rails

==============================================
=== rails / static / 6800c (tool=wrk) ===
==============================================
[info] waiting for server...
[info] server ready

[run 1/3]
Running 5s test @ http://localhost:8080
  64 threads and 6800 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency    52.94ms   27.42ms 560.71ms   88.28%
    Req/Sec     1.77k   819.25     4.84k    77.49%
  566636 requests in 5.12s, 8.69GB read
Requests/sec: 110650.20
Transfer/sec:      1.70GB
[info] CPU 6415.8% | Mem 6.1GiB

[run 2/3]
Running 5s test @ http://localhost:8080
  64 threads and 6800 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency    50.73ms   18.41ms 348.09ms   83.99%
    Req/Sec     1.92k   721.07    10.88k    80.25%
  620698 requests in 5.10s, 9.52GB read
Requests/sec: 121700.50
Transfer/sec:      1.87GB
[info] CPU 6533.7% | Mem 5.9GiB

[run 3/3]
Running 5s test @ http://localhost:8080
  64 threads and 6800 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency    50.88ms   19.37ms 391.64ms   84.90%
    Req/Sec     1.92k   709.22     9.76k    80.33%
  621171 requests in 5.10s, 9.53GB read
Requests/sec: 121783.26
Transfer/sec:      1.87GB
[info] CPU 6452.7% | Mem 5.9GiB

=== Best: 121783 req/s (CPU: 6452.7%, Mem: 5.9GiB) ===
[info] saved results/static/6800/rails.json
httparena-bench-rails
httparena-bench-rails

==============================================
=== rails / async-db / 1024c (tool=gcannon) ===
==============================================
[info] waiting for server...
[info] server ready

[run 1/3]
gcannon v0.5.3
  Target:    localhost:8080/
  Threads:   64
  Conns:     1024 (16/thread)
  Pipeline:  1
  Req/conn:  25
  Templates: 5
  Expected:  200
  Duration:  10s


  Thread Stats   Avg      p50      p90      p99    p99.9
    Latency   14.88ms   14.00ms   21.80ms   34.40ms   212.30ms

  665217 requests in 10.00s, 665217 responses
  Throughput: 66.50K req/s
  Bandwidth:  277.27MB/s
  Status codes: 2xx=665217, 3xx=0, 4xx=0, 5xx=0
  Latency samples: 665217 / 665217 responses (100.0%)
  Reconnects: 26115
  Per-template: 132816,133172,133403,133214,132612
  Per-template-ok: 132816,133172,133403,133214,132612
[info] CPU 6317.8% | Mem 2.8GiB

[run 2/3]
gcannon v0.5.3
  Target:    localhost:8080/
  Threads:   64
  Conns:     1024 (16/thread)
  Pipeline:  1
  Req/conn:  25
  Templates: 5
  Expected:  200
  Duration:  10s


  Thread Stats   Avg      p50      p90      p99    p99.9
    Latency   14.34ms   14.20ms   21.10ms   29.90ms   57.50ms

  684048 requests in 10.00s, 684048 responses
  Throughput: 68.39K req/s
  Bandwidth:  285.35MB/s
  Status codes: 2xx=684048, 3xx=0, 4xx=0, 5xx=0
  Latency samples: 684048 / 684048 responses (100.0%)
  Reconnects: 27059
  Per-template: 136379,136757,137241,137159,136512
  Per-template-ok: 136379,136757,137241,137159,136512
[info] CPU 6391.5% | Mem 2.9GiB

[run 3/3]
gcannon v0.5.3
  Target:    localhost:8080/
  Threads:   64
  Conns:     1024 (16/thread)
  Pipeline:  1
  Req/conn:  25
  Templates: 5
  Expected:  200
  Duration:  10s


  Thread Stats   Avg      p50      p90      p99    p99.9
    Latency   14.34ms   14.20ms   21.60ms   30.10ms   52.00ms

  679145 requests in 10.00s, 679148 responses
  Throughput: 67.90K req/s
  Bandwidth:  283.51MB/s
  Status codes: 2xx=679148, 3xx=0, 4xx=0, 5xx=0
  Latency samples: 679148 / 679148 responses (100.0%)
  Reconnects: 26874
  Per-template: 135260,135618,136167,136397,135706
  Per-template-ok: 135260,135618,136167,136397,135706
[info] CPU 6406.5% | Mem 2.9GiB

=== Best: 68404 req/s (CPU: 6391.5%, Mem: 2.9GiB) ===
[info] input BW: 4.57MB/s (avg template: 70 bytes)
[info] saved results/async-db/1024/rails.json
httparena-bench-rails
httparena-bench-rails
[info] skip: rails does not subscribe to crud
[info] skip: rails does not subscribe to fortunes
[info] skip: rails does not subscribe to baseline-h2
[info] skip: rails does not subscribe to static-h2
[info] skip: rails does not subscribe to baseline-h2c
[info] skip: rails does not subscribe to json-h2c
[info] skip: rails does not subscribe to baseline-h3
[info] skip: rails does not subscribe to static-h3
[info] skip: rails does not subscribe to gateway-64
[info] skip: rails does not subscribe to gateway-h3
[info] skip: rails does not subscribe to production-stack
[info] skip: rails does not subscribe to unary-grpc
[info] skip: rails does not subscribe to unary-grpc-tls
[info] skip: rails does not subscribe to stream-grpc
[info] skip: rails does not subscribe to stream-grpc-tls
[info] skip: rails does not subscribe to echo-ws
[info] skip: rails does not subscribe to echo-ws-pipeline
[info] rebuilding site/data/*.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/frameworks.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/api-16-1024.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/api-4-256.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/async-db-1024.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/baseline-4096.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/baseline-512.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/json-4096.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/json-comp-16384.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/json-comp-4096.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/json-comp-512.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/json-tls-4096.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/limited-conn-4096.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/limited-conn-512.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/pipelined-4096.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/pipelined-512.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/static-1024.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/static-4096.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/static-6800.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/upload-256.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/upload-32.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/current.json
[info] done
httparena-postgres
[info] restoring loopback MTU to 65536
[info] restoring CPU governor → powersave

p8 · 2026-05-12T14:58:00Z

/benchmark -f rails --save

github-actions · 2026-05-12T14:58:16Z

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

github-actions · 2026-05-12T15:40:22Z

Benchmark Results

Framework: rails | Test: all tests

Test	Conn	RPS	CPU	Mem	Δ RPS	Δ Mem
baseline	512	77,800	5704.5%	6.8GiB	+30.4%	+4.6%
baseline	4096	34,370	4988.7%	6.5GiB	+10.2%	+4.8%
pipelined	512	304,348	6489.6%	2.2GiB	-3.3%	-12.0%
pipelined	4096	286,715	6366.0%	2.3GiB	-8.6%	-11.5%
limited-conn	512	27,507	4585.2%	5.0GiB	-0.9%	-16.7%
limited-conn	4096	27,361	4699.5%	5.7GiB	-1.2%	-6.6%
json	4096	121,954	6386.9%	3.7GiB	-0.6%	-15.9%
json-comp	512	81,405	6484.1%	3.0GiB	-3.8%	-25.0%
json-comp	4096	80,772	6387.8%	3.9GiB	-4.0%	-4.9%
json-comp	16384	84,182	6497.3%	5.0GiB	+1.8%	+16.3%
json-tls	4096	110,489	6468.5%	4.1GiB	-5.9%	-24.1%
upload	32	938	3062.7%	10.9GiB	+0.5%	~0%
upload	256	888	6333.8%	8.4GiB	-1.0%	+16.7%
api-4	256	9,791	393.4%	309MiB	-3.5%	-18.9%
api-16	1024	24,502	1732.7%	911MiB	-5.6%	-19.1%
static	1024	125,531	6526.3%	6.0GiB	+5.3%	-15.5%
static	4096	121,768	6516.3%	5.9GiB	+1.5%	-34.4%
static	6800	119,299	6509.8%	5.9GiB	-2.0%	-37.2%
async-db	1024	68,747	6394.8%	2.8GiB	+1.0%	-6.7%

Full log

[run 2/3]
Running 5s test @ http://localhost:8080
  64 threads and 4096 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency    32.07ms    8.86ms 270.74ms   82.32%
    Req/Sec     1.92k   467.06     7.90k    82.56%
  621032 requests in 5.10s, 9.52GB read
Requests/sec: 121768.31
Transfer/sec:      1.87GB
[info] CPU 6516.3% | Mem 5.9GiB

[run 3/3]
Running 5s test @ http://localhost:8080
  64 threads and 4096 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency    32.89ms    9.73ms 278.55ms   84.11%
    Req/Sec     1.87k   483.89    10.52k    86.67%
  605595 requests in 5.10s, 9.29GB read
Requests/sec: 118740.30
Transfer/sec:      1.82GB
[info] CPU 6479.1% | Mem 5.9GiB

=== Best: 121768 req/s (CPU: 6516.3%, Mem: 5.9GiB) ===
[info] saved results/static/4096/rails.json
httparena-bench-rails
httparena-bench-rails

==============================================
=== rails / static / 6800c (tool=wrk) ===
==============================================
[info] waiting for server...
[info] server ready

[run 1/3]
Running 5s test @ http://localhost:8080
  64 threads and 6800 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency    55.21ms   31.03ms 551.45ms   87.59%
    Req/Sec     1.76k   793.65     4.96k    79.76%
  561276 requests in 5.10s, 8.61GB read
Requests/sec: 109989.68
Transfer/sec:      1.69GB
[info] CPU 6383.5% | Mem 6.0GiB

[run 2/3]
Running 5s test @ http://localhost:8080
  64 threads and 6800 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency    52.09ms   19.72ms 480.26ms   85.36%
    Req/Sec     1.88k   657.77     8.21k    80.53%
  608755 requests in 5.10s, 9.33GB read
Requests/sec: 119299.07
Transfer/sec:      1.83GB
[info] CPU 6509.8% | Mem 5.9GiB

[run 3/3]
Running 5s test @ http://localhost:8080
  64 threads and 6800 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency    55.01ms   37.08ms 596.08ms   96.26%
    Req/Sec     1.86k   685.88     8.68k    78.81%
  602018 requests in 5.10s, 9.23GB read
Requests/sec: 117938.50
Transfer/sec:      1.81GB
[info] CPU 6424.9% | Mem 5.9GiB

=== Best: 119299 req/s (CPU: 6509.8%, Mem: 5.9GiB) ===
[info] saved results/static/6800/rails.json
httparena-bench-rails
httparena-bench-rails

==============================================
=== rails / async-db / 1024c (tool=gcannon) ===
==============================================
[info] waiting for server...
[info] server ready

[run 1/3]
gcannon v0.5.3
  Target:    localhost:8080/
  Threads:   64
  Conns:     1024 (16/thread)
  Pipeline:  1
  Req/conn:  25
  Templates: 5
  Expected:  200
  Duration:  10s


  Thread Stats   Avg      p50      p90      p99    p99.9
    Latency   14.65ms   13.90ms   21.80ms   34.90ms   204.90ms

  666090 requests in 10.00s, 666090 responses
  Throughput: 66.58K req/s
  Bandwidth:  277.66MB/s
  Status codes: 2xx=666090, 3xx=0, 4xx=0, 5xx=0
  Latency samples: 666090 / 666090 responses (100.0%)
  Reconnects: 26163
  Per-template: 132636,133361,134047,133398,132648
  Per-template-ok: 132636,133361,134047,133398,132648
[info] CPU 6288.2% | Mem 2.8GiB

[run 2/3]
gcannon v0.5.3
  Target:    localhost:8080/
  Threads:   64
  Conns:     1024 (16/thread)
  Pipeline:  1
  Req/conn:  25
  Templates: 5
  Expected:  200
  Duration:  10s


  Thread Stats   Avg      p50      p90      p99    p99.9
    Latency   14.28ms   14.00ms   21.50ms   31.20ms   50.60ms

  687478 requests in 10.00s, 687479 responses
  Throughput: 68.72K req/s
  Bandwidth:  286.57MB/s
  Status codes: 2xx=687479, 3xx=0, 4xx=0, 5xx=0
  Latency samples: 687479 / 687479 responses (100.0%)
  Reconnects: 27192
  Per-template: 137284,137664,137792,137439,137300
  Per-template-ok: 137284,137664,137792,137439,137300
[info] CPU 6394.8% | Mem 2.8GiB

[run 3/3]
gcannon v0.5.3
  Target:    localhost:8080/
  Threads:   64
  Conns:     1024 (16/thread)
  Pipeline:  1
  Req/conn:  25
  Templates: 5
  Expected:  200
  Duration:  10s


  Thread Stats   Avg      p50      p90      p99    p99.9
    Latency   14.21ms   14.00ms   21.60ms   30.20ms   42.70ms

  686546 requests in 10.00s, 686548 responses
  Throughput: 68.62K req/s
  Bandwidth:  286.38MB/s
  Status codes: 2xx=686548, 3xx=0, 4xx=0, 5xx=0
  Latency samples: 686546 / 686548 responses (100.0%)
  Reconnects: 27188
  Per-template: 136784,137449,137600,137529,137184
  Per-template-ok: 136784,137449,137600,137529,137184
[info] CPU 6422.9% | Mem 2.9GiB

=== Best: 68747 req/s (CPU: 6394.8%, Mem: 2.8GiB) ===
[info] input BW: 4.59MB/s (avg template: 70 bytes)
[info] saved results/async-db/1024/rails.json
httparena-bench-rails
httparena-bench-rails
[info] skip: rails does not subscribe to crud
[info] skip: rails does not subscribe to fortunes
[info] skip: rails does not subscribe to baseline-h2
[info] skip: rails does not subscribe to static-h2
[info] skip: rails does not subscribe to baseline-h2c
[info] skip: rails does not subscribe to json-h2c
[info] skip: rails does not subscribe to baseline-h3
[info] skip: rails does not subscribe to static-h3
[info] skip: rails does not subscribe to gateway-64
[info] skip: rails does not subscribe to gateway-h3
[info] skip: rails does not subscribe to production-stack
[info] skip: rails does not subscribe to unary-grpc
[info] skip: rails does not subscribe to unary-grpc-tls
[info] skip: rails does not subscribe to stream-grpc
[info] skip: rails does not subscribe to stream-grpc-tls
[info] skip: rails does not subscribe to echo-ws
[info] skip: rails does not subscribe to echo-ws-pipeline
[info] rebuilding site/data/*.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/frameworks.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/api-16-1024.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/api-4-256.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/async-db-1024.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/baseline-4096.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/baseline-512.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/json-4096.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/json-comp-16384.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/json-comp-4096.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/json-comp-512.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/json-tls-4096.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/limited-conn-4096.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/limited-conn-512.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/pipelined-4096.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/pipelined-512.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/static-1024.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/static-4096.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/static-6800.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/upload-256.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/upload-32.json
[updated] /home/diogo/actions-runner/_work/HttpArena/HttpArena/site/data/current.json
[info] done
httparena-postgres
[info] restoring loopback MTU to 65536
[info] restoring CPU governor → powersave

[rails] Let Rails enable YJIT

553318c

This makes sure no methods get jitted that are only used for startup.

p8 requested review from Kaliumhexacyanoferrat and MDA2AV as code owners May 12, 2026 14:02

Benchmark results: rails

58c5c47

MDA2AV approved these changes May 12, 2026

View reviewed changes

MDA2AV merged commit c5410c0 into MDA2AV:main May 12, 2026

p8 deleted the rails/delay-yjit branch May 13, 2026 13:41

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[rails] Let Rails enable YJIT#704

[rails] Let Rails enable YJIT#704
MDA2AV merged 2 commits into
MDA2AV:mainfrom
p8:rails/delay-yjit

p8 commented May 12, 2026

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p8 commented May 12, 2026

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Development

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