Backend: Spring-style test framework, hellocodenameone e2e server, API cleanup by shai-almog · Pull Request #5932 · codenameone/CodenameOne

shai-almog · 2026-10-02T02:26:58Z

Summary

API cleanup. The public backend API is now what an application writes against.

Removed the Spring aliases and no-op annotations (@Service, @Repository, @RequestScope, @SessionScope, @EnableAsync, @EnableScheduling, @EnableMcpServer) and the settings annotations (@ServerConfig, @DataSourceConfig, @SessionConfig, @StaticFilesConfig). The build now compiles application.properties into the server instead.
Generated-code plumbing (Wiring, JsonCodec, AsyncTask, Scheduler, the MCP internals, Backend.Application/Environment, ...) moved to com.codename1.impl.backend, behind a single BackendAccess bridge. check-backend-javadoc-internals.sh keeps it out of the backend reference.

Test framework (codenameone-backend-test).

@BackendTest with MOCK, RANDOM_PORT, DEFINED_PORT and NONE web environments, MockMvc with Spring's builders and matchers, TestRestTemplate, @LocalServerPort, @TestConfiguration and @MockitoBean.
The build generates each test's wiring (process-test-annotations), so nothing is looked up by reflection.
The same JUnit 5 tests run on the JVM, and with -Dcn1.backend.compiledTests=true they are also translated into a native test binary (cn1:backend-test). That binary compiles against a JUnit subset shim and writes TEST-*-compiled.xml.
Settings a test names win over the environment, so an exported DATABASE_URL or PORT can't redirect a test.

Server gaps.

CORS (cn1.cors.*).
multipart/form-data with @RequestPart, and form fields through @RequestParam.
gzip responses (cn1.server.compression.*) and gzip request bodies, using the core JZlib, now @SharedWithBackend.
cn1.server.address.

hellocodenameone backend.

scripts/hellocodenameone/backend replaces vm/backend/demo/cn1ss and scripts/common/java/Cn1ssScreenshotServer.java as the one CI server. It serves the screenshot websocket plus a REST surface.
New device tests in common/.../tests/backend drive that REST surface through Rest, ConnectionRequest, multipart and a generated @RestClient.
It runs natively where a native backend exists and on the JVM elsewhere; Windows gets a prebuilt copy.

Wiring.

CI: a new backend-compiled-tests job runs both runners, and backend-test is added to the pr.yml gates. Path filters and Windows jobs now point at the new server.
Archetype and initializr: the template backend gets the test dependencies and goals plus sample tests. Its root pom no longer lets the client surefire provider swallow the backend's JUnit tests.
Docs: a new Backend testing chapter, CORS, uploads and compression in Backend web, and the skill reference.

Verified locally

SpotBugs, PMD and Checkstyle gates (core-unittests line included): 0 findings.
maven/backend: 470 tests. Plugin: 2674 tests.
hellocodenameone backend: 18 tests on the JVM, 16 compiled natively.
Archetype-generated project: 3/3 on both runners.
Guide demo tests: 5 on the JVM, 4 compiled.
vm/tests: BackendHttpIntegrationTest (73), BackendWebSocketIntegrationTest (7, now against the translated hellocodenameone backend) and BackendRuntimeSelfTest.
Backend javadoc under doclint; the guide snippet, structure and Vale checks.

Not verified locally

The device legs running the new backend client tests (Android, iOS, JS, macOS, Linux, Windows).
The server.sh install fallback on a runner with nothing preinstalled.
BackendJavaSeRuntimeTest failed one check ("an oversized header block is refused") on this machine. That is a known artifact of the substitute local JDK 8u372; CI's Temurin 8 is unaffected.

🤖 Generated with Claude Code

@backendtest

…I cleanup - Public backend API is now what an app writes against: the Spring aliases and settings annotations are gone (application.properties is compiled in instead) and the generated-code plumbing moved to com.codename1.impl.backend, which the backend javadoc excludes. - codenameone-backend-test: @backendtest, MockMvc, TestRestTemplate, @TestConfiguration and @MockitoBean. The same JUnit 5 tests run on the JVM and, with -Dcn1.backend.compiledTests=true, translated into a native test binary. - CORS, multipart/@RequestPart and gzip in the server. - scripts/hellocodenameone/backend replaces demo/cn1ss and the legacy Java server as the single CI server: the screenshot websocket plus the REST surface new device tests in common drive. - Archetype, initializr template, docs and CI wired to all of the above. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

They are touched only to mark them @SharedWithBackend, which pulls them into the diff-scoped header check; they keep JCraft's BSD notice. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

@service

…and-cleanup #5922 moved the plugin's processors and the backend packager into maven/build-engine. Resolved by moving this branch's work onto that layout: - The backend test pass (BackendTestGenerator, BackendTests) lives in the build engine, on its Log/BuildExecutionException types. - The compiled test run is BackendTestPackager, a BackendPackager subclass in the engine, over extension hooks added to BackendPackager. BackendTestMojo is a thin Maven front for it, as BackendPackageMojo is for BackendPackager; the AbstractBackendNativeMojo this branch had is gone. - Gradle backends get the same support: codenameone-backend-test and JUnit 5 on the test classpath, a JVM per test class, the test pass after compileTestJava, and a backendTest task for the compiled run. The Gradle backend template and the initializr's Gradle downloads carry the sample tests, and gradle-smoke runs them. - The Gradle Greeter template uses @component, not the removed @service. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

github-actions · 2026-10-02T02:55:59Z

Blog prose gate

✅ No net-new prose findings introduced by this PR.

github-actions · 2026-10-02T03:05:22Z

Developer Guide build artifacts are available for download from this workflow run:

Developer Guide quality checks:

AsciiDoc linter: No issues found (report)
Vale: No alerts found (report)
Paragraph capitalization: No paragraph capitalization issues (report)
LanguageTool: No grammar matches (report)
Image references: No unused images detected (report)

shai-almog · 2026-10-02T03:05:38Z

Compared 12 screenshots: 12 matched.
✅ JavaSE simulator integration screenshots matched stored baselines.

shai-almog · 2026-10-02T03:12:31Z

Native fidelity (Android, Material 3)

54 pairs compared -- median 95.6%, worst 91.3% (FlatButton_pressed_dark), 25th pct 94.9%, mean 95.7%.

Distribution -- >=99%: 2 | 95-99%: 37 | 90-95%: 15 | <90%: 0

Component	State	Appearance	Material	Fidelity	SSIM	mean delta	Geometry
FlatButton	pressed	dark	normal	91.3%	0.899	3.10	ok
Tabs	normal	light	normal	92.3%	0.914	3.05	ok
Button	pressed	dark	normal	92.6%	0.949	4.32	ok
FlatButton	normal	dark	normal	93.2%	0.938	2.69	ok
Button	disabled	dark	normal	93.3%	0.928	2.20	ok
Button	pressed	light	normal	93.3%	0.952	3.68	ok
FlatButton	normal	light	normal	93.7%	0.941	2.29	ok
FlatButton	pressed	light	normal	93.8%	0.942	2.56	ok
FloatingActionButton	pressed	light	normal	94.4%	0.927	2.82	OFF (h 0.88)
RadioButton	normal	dark	normal	94.5%	0.963	2.19	ok
RadioButton	normal	light	normal	94.7%	0.964	1.85	ok
CheckBox	selected	dark	normal	94.7%	0.950	2.60	ok
RadioButton	selected	dark	normal	94.8%	0.963	2.42	ok
CheckBox	normal	dark	normal	94.9%	0.952	2.69	ok
Button	normal	dark	normal	94.9%	0.949	3.16	ok
CheckBox	normal	light	normal	95.0%	0.953	2.30	ok
Toolbar	normal	dark	normal	95.1%	0.906	1.60	ok
RaisedButton	pressed	dark	normal	95.2%	0.950	2.39	ok
CheckBox	disabled	dark	normal	95.2%	0.954	1.47	ok
CheckBox	disabled	light	normal	95.2%	0.956	1.34	ok
Tabs	normal	dark	normal	95.2%	0.913	3.65	ok
RadioButton	disabled	dark	normal	95.3%	0.963	1.18	ok
RadioButton	selected	light	normal	95.3%	0.964	1.84	ok
CheckBox	selected	light	normal	95.4%	0.952	2.06	ok
Switch	selected	light	normal	95.4%	0.966	1.59	ok
Switch	selected	dark	normal	95.5%	0.966	1.86	ok
RadioButton	disabled	light	normal	95.5%	0.966	1.08	ok
Switch	disabled	dark	normal	95.6%	0.961	0.85	ok
Dialog	normal	light	normal	95.7%	0.930	2.30	ok
RaisedButton	pressed	light	normal	95.8%	0.958	2.16	ok
Button	normal	light	normal	95.8%	0.953	2.46	ok
Dialog	normal	dark	normal	95.8%	0.932	2.30	ok
Switch	normal	light	normal	96.0%	0.961	1.45	ok
FloatingActionButton	normal	light	normal	96.1%	0.937	1.14	ok
FloatingActionButton	pressed	dark	normal	96.2%	0.951	2.45	ok
Switch	normal	dark	normal	96.2%	0.962	1.39	ok
TextField	disabled	dark	normal	96.2%	0.965	0.76	ok
RaisedButton	normal	dark	normal	96.4%	0.952	1.78	ok
Switch	disabled	light	normal	96.4%	0.970	0.61	ok
Button	disabled	light	normal	96.8%	0.960	1.06	ok
ProgressBar	normal	dark	normal	96.9%	0.967	2.03	OFF (h 1.50)
RaisedButton	disabled	dark	normal	97.0%	0.955	0.89	ok
FloatingActionButton	normal	dark	normal	97.1%	0.952	1.43	ok
ProgressBar	normal	light	normal	97.3%	0.974	1.53	OFF (h 1.50)
RaisedButton	disabled	light	normal	97.3%	0.961	0.79	ok
TextField	disabled	light	normal	97.3%	0.965	0.79	ok
RaisedButton	normal	light	normal	97.3%	0.961	1.40	ok
TextField	normal	dark	normal	97.6%	0.958	1.83	ok
TextField	normal	light	normal	97.6%	0.958	1.63	ok
Slider	normal	dark	normal	98.4%	0.990	0.87	ok
Toolbar	normal	light	normal	98.7%	0.974	1.28	ok
Slider	normal	light	normal	99.0%	0.991	0.47	ok
Slider	disabled	dark	normal	99.6%	0.993	0.22	ok
Slider	disabled	light	normal	99.6%	0.993	0.18	ok

Geometry vs native (bbox offset / size ratio / center offset / corner radius) -- gated separately from the visual score

Component	State	Appearance	bbox dx,dy (px)	w ratio	h ratio	center off (px)	radius native->cn1 (px)
FloatingActionButton	pressed	light	+0,+0	0.929	0.881	4.0	-
FloatingActionButton	normal	light	+0,+0	0.946	0.912	2.9	-
Button	pressed	dark	+0,+0	0.947	0.975	2.6	-
Button	disabled	dark	+0,+0	0.947	0.975	2.6	-
Button	pressed	light	+0,+0	0.947	0.975	2.6	-
Button	normal	dark	+0,+0	0.947	0.975	2.6	-
RaisedButton	pressed	dark	+0,+0	0.945	0.975	2.6	-
RaisedButton	pressed	light	+0,+0	0.945	0.975	2.6	-
Button	normal	light	+0,+0	0.947	0.975	2.6	-
RaisedButton	normal	dark	+0,+0	0.945	0.975	2.6	-
Button	disabled	light	+0,+0	0.947	0.975	2.6	-
RaisedButton	disabled	dark	+0,+0	0.945	0.975	2.6	-
RaisedButton	disabled	light	+0,+0	0.945	0.975	2.6	-
RaisedButton	normal	light	+0,+0	0.945	0.975	2.6	-
RadioButton	normal	dark	+1,+1	1.029	1.000	2.2	-
RadioButton	normal	light	+1,+1	1.029	1.000	2.2	-
RadioButton	selected	dark	+1,+1	1.029	1.000	2.2	-
RadioButton	disabled	dark	+1,+1	1.029	1.000	2.2	-
RadioButton	selected	light	+1,+1	1.029	1.000	2.2	-
Switch	selected	light	+0,+0	1.080	1.063	2.2	-
RadioButton	disabled	light	+1,+1	1.029	1.000	2.2	-
CheckBox	selected	dark	+1,+1	1.013	1.000	1.8	-
CheckBox	normal	dark	+1,+1	1.013	1.000	1.8	-
CheckBox	normal	light	+1,+1	1.013	1.000	1.8	-
CheckBox	disabled	dark	+1,+1	1.013	1.000	1.8	-
CheckBox	disabled	light	+1,+1	1.013	1.000	1.8	-
CheckBox	selected	light	+1,+1	1.013	1.000	1.8	-
Switch	selected	dark	+0,+0	1.060	1.031	1.6	-
Switch	disabled	dark	+0,-1	1.060	1.031	1.6	-
Dialog	normal	light	+0,+0	1.007	0.982	1.6	-
Dialog	normal	dark	+0,+0	1.007	0.982	1.6	-
Switch	normal	light	+0,-1	1.060	1.031	1.6	-
Switch	normal	dark	+0,-1	1.060	1.031	1.6	-
Switch	disabled	light	+0,-1	1.060	1.031	1.6	-
FloatingActionButton	pressed	dark	+0,+0	0.963	0.963	1.4	-
FloatingActionButton	normal	dark	+0,+0	0.963	0.963	1.4	-
Toolbar	normal	light	-1,+1	1.000	1.000	1.4	-
FlatButton	pressed	dark	+0,+0	0.977	0.975	1.1	-
FlatButton	normal	dark	+0,+0	0.977	0.975	1.1	-
FlatButton	normal	light	+0,+0	0.977	0.975	1.1	-
FlatButton	pressed	light	+0,+0	0.977	0.975	1.1	-
TextField	normal	dark	+0,+0	1.015	1.036	1.1	-
TextField	normal	light	+0,+0	1.015	1.036	1.1	-
Toolbar	normal	dark	+0,+0	1.000	1.032	1.0	-
ProgressBar	normal	dark	+0,+0	1.000	1.500	1.0	-
ProgressBar	normal	light	+0,+0	1.000	1.500	1.0	-
TextField	disabled	dark	+0,+0	1.015	1.018	0.7	-
TextField	disabled	light	+0,+0	1.015	1.018	0.7	-
Tabs	normal	light	+0,+1	1.000	0.984	0.5	-
Slider	normal	dark	+1,+0	0.996	1.000	0.5	-
Slider	normal	light	+1,+0	0.996	1.000	0.5	-
Tabs	normal	dark	+0,+0	1.000	1.000	0.0	-
Slider	disabled	dark	+0,+0	1.000	1.000	0.0	-
Slider	disabled	light	+0,+0	1.000	1.000	0.0	-

Side-by-side comparisons (worst first)

FlatButton_pressed_dark -- 91.25% fidelity (SSIM 0.8985) (no change)

Left: native widget. Right: Codename One render.
Tabs_normal_light -- 92.28% fidelity (SSIM 0.9140) (no change)

Left: native widget. Right: Codename One render.
Button_pressed_dark -- 92.61% fidelity (SSIM 0.9485) (no change)

Left: native widget. Right: Codename One render.
FlatButton_normal_dark -- 93.24% fidelity (SSIM 0.9381) (no change)

Left: native widget. Right: Codename One render.
Button_disabled_dark -- 93.26% fidelity (SSIM 0.9278) (no change)

Left: native widget. Right: Codename One render.
Button_pressed_light -- 93.34% fidelity (SSIM 0.9521) (no change)

Left: native widget. Right: Codename One render.
FlatButton_normal_light -- 93.72% fidelity (SSIM 0.9410) (no change)

Left: native widget. Right: Codename One render.
FlatButton_pressed_light -- 93.77% fidelity (SSIM 0.9424) (no change)

Left: native widget. Right: Codename One render.
FloatingActionButton_pressed_light -- 94.44% fidelity (SSIM 0.9273) (no change)

Left: native widget. Right: Codename One render.
RadioButton_normal_dark -- 94.46% fidelity (SSIM 0.9630) (no change)

Left: native widget. Right: Codename One render.
RadioButton_normal_light -- 94.69% fidelity (SSIM 0.9643) (no change)

Left: native widget. Right: Codename One render.
CheckBox_selected_dark -- 94.71% fidelity (SSIM 0.9502) (no change)

Left: native widget. Right: Codename One render.
RadioButton_selected_dark -- 94.79% fidelity (SSIM 0.9630) (no change)

Left: native widget. Right: Codename One render.
CheckBox_normal_dark -- 94.93% fidelity (SSIM 0.9516) (no change)

Left: native widget. Right: Codename One render.
Button_normal_dark -- 94.94% fidelity (SSIM 0.9491) (no change)

Left: native widget. Right: Codename One render.
CheckBox_normal_light -- 95.03% fidelity (SSIM 0.9531) (no change)

Left: native widget. Right: Codename One render.
Toolbar_normal_dark -- 95.07% fidelity (SSIM 0.9059) (no change)

Left: native widget. Right: Codename One render.
RaisedButton_pressed_dark -- 95.19% fidelity (SSIM 0.9501) (no change)

Left: native widget. Right: Codename One render.
CheckBox_disabled_dark -- 95.20% fidelity (SSIM 0.9538) (no change)

Left: native widget. Right: Codename One render.
CheckBox_disabled_light -- 95.21% fidelity (SSIM 0.9562) (no change)

Left: native widget. Right: Codename One render.
Tabs_normal_dark -- 95.23% fidelity (SSIM 0.9125) (no change)

Left: native widget. Right: Codename One render.
RadioButton_disabled_dark -- 95.29% fidelity (SSIM 0.9630) (no change)

Left: native widget. Right: Codename One render.
RadioButton_selected_light -- 95.33% fidelity (SSIM 0.9642) (no change)

Left: native widget. Right: Codename One render.
CheckBox_selected_light -- 95.37% fidelity (SSIM 0.9524) (no change)

Left: native widget. Right: Codename One render.
Switch_selected_light -- 95.37% fidelity (SSIM 0.9658) (no change)

Left: native widget. Right: Codename One render.
Switch_selected_dark -- 95.45% fidelity (SSIM 0.9656) (no change)

Left: native widget. Right: Codename One render.
RadioButton_disabled_light -- 95.46% fidelity (SSIM 0.9657) (no change)

Left: native widget. Right: Codename One render.
Switch_disabled_dark -- 95.57% fidelity (SSIM 0.9613) (no change)

Left: native widget. Right: Codename One render.
Dialog_normal_light -- 95.65% fidelity (SSIM 0.9300) (no change)

Left: native widget. Right: Codename One render.
RaisedButton_pressed_light -- 95.78% fidelity (SSIM 0.9578) (no change)

Left: native widget. Right: Codename One render.
Button_normal_light -- 95.79% fidelity (SSIM 0.9528) (no change)

Left: native widget. Right: Codename One render.
Dialog_normal_dark -- 95.79% fidelity (SSIM 0.9322) (no change)

Left: native widget. Right: Codename One render.
Switch_normal_light -- 95.97% fidelity (SSIM 0.9612) (no change)

Left: native widget. Right: Codename One render.
FloatingActionButton_normal_light -- 96.09% fidelity (SSIM 0.9367) (no change)

Left: native widget. Right: Codename One render.
FloatingActionButton_pressed_dark -- 96.16% fidelity (SSIM 0.9513) (no change)

Left: native widget. Right: Codename One render.
Switch_normal_dark -- 96.17% fidelity (SSIM 0.9616) (no change)

Left: native widget. Right: Codename One render.
TextField_disabled_dark -- 96.21% fidelity (SSIM 0.9648) (no change)

Left: native widget. Right: Codename One render.
RaisedButton_normal_dark -- 96.41% fidelity (SSIM 0.9516) (no change)

Left: native widget. Right: Codename One render.
Switch_disabled_light -- 96.43% fidelity (SSIM 0.9698) (no change)

Left: native widget. Right: Codename One render.
Button_disabled_light -- 96.80% fidelity (SSIM 0.9596) (no change)

Left: native widget. Right: Codename One render.
ProgressBar_normal_dark -- 96.91% fidelity (SSIM 0.9669) (no change)

Left: native widget. Right: Codename One render.
RaisedButton_disabled_dark -- 97.02% fidelity (SSIM 0.9549) (no change)

Left: native widget. Right: Codename One render.
FloatingActionButton_normal_dark -- 97.07% fidelity (SSIM 0.9521) (no change)

Left: native widget. Right: Codename One render.
ProgressBar_normal_light -- 97.26% fidelity (SSIM 0.9739) (no change)

Left: native widget. Right: Codename One render.
RaisedButton_disabled_light -- 97.26% fidelity (SSIM 0.9611) (no change)

Left: native widget. Right: Codename One render.
TextField_disabled_light -- 97.29% fidelity (SSIM 0.9649) (no change)

Left: native widget. Right: Codename One render.
RaisedButton_normal_light -- 97.32% fidelity (SSIM 0.9613) (no change)

Left: native widget. Right: Codename One render.
TextField_normal_dark -- 97.61% fidelity (SSIM 0.9583) (no change)

Left: native widget. Right: Codename One render.
TextField_normal_light -- 97.62% fidelity (SSIM 0.9582) (no change)

Left: native widget. Right: Codename One render.
Slider_normal_dark -- 98.39% fidelity (SSIM 0.9900) (no change)

Left: native widget. Right: Codename One render.
Toolbar_normal_light -- 98.69% fidelity (SSIM 0.9739) (no change)

Left: native widget. Right: Codename One render.
Slider_normal_light -- 98.95% fidelity (SSIM 0.9908) (no change)

Left: native widget. Right: Codename One render.
Slider_disabled_dark -- 99.56% fidelity (SSIM 0.9927) (no change)

Left: native widget. Right: Codename One render.
Slider_disabled_light -- 99.59% fidelity (SSIM 0.9932) (no change)

Left: native widget. Right: Codename One render.

github-actions · 2026-10-02T03:14:02Z

Cloudflare Preview

URL: https://pr-5932-website-preview.codenameone.pages.dev
Branch: pr-5932-website-preview

github-actions · 2026-10-02T03:31:44Z

✅ Continuous Quality Report

Test & Coverage

✅ Tests: 10767 total, 0 failed, 72 skipped
📊 Line coverage: 63.58% [HTML preview] [Download]
- Lowest covered classes
  - com.codename1.gaming.level.GameSceneView – 0.00%
  - com.codename1.crash.CrashProtection – 0.00%
  - com.codename1.payment.CommerceManager – 0.00%
  - com.codename1.wearable.WearableMessage – 0.00%
  - com.codename1.ui.plaf.GlassLensBlend – 0.00%
  - com.codename1.vr.VRView – 0.00%
  - com.codename1.appreview.RatingDialog – 0.00%
  - com.codename1.db.ManagedKeys – 0.00%
  - com.codename1.calendar.DefaultCalendarHttpTransport – 0.00%
  - com.codename1.security.Secrets – 0.00%

Static Analysis

SpotBugs [Report archive]
- ✅ ByteCodeTranslator: 0 findings (no issues)
- ✅ android: 0 findings (no issues)
- ✅ backend: 0 findings (no issues)
- ✅ backend-test: 0 findings (no issues)
- ✅ build-engine: 0 findings (no issues)
- ✅ build-hint-catalog: 0 findings (no issues)
- ✅ build-hint-tools: 0 findings (no issues)
- ✅ codenameone-gradle-plugin: 0 findings (no issues)
- ✅ codenameone-maven-plugin: 0 findings (no issues)
- ✅ core-unittests: 0 findings (no issues)
- ✅ ios: 0 findings (no issues)
- ✅ project-model: 0 findings (no issues)
❌ PMD: 1 findings (P3: 1) [HTML preview] [Download]
- Top findings
  - P3: vm/backend/test/src/com/codename1/impl/backend/test/TestContexts.java:81 – Do not hard code the IP address (rule: AvoidUsingHardCodedIP)
✅ Checkstyle: 0 findings (no issues) [Report archive]

Generated automatically by the PR CI workflow.

shai-almog · 2026-10-02T03:31:59Z

Compared 172 screenshots: 172 matched.
Native Windows port (x64 / Intel-AMD): full hellocodenameone screenshot suite rendered offscreen with Direct2D/DirectWrite, plus the real benchmarks (base64 native/CN1/SIMD, image createMask/applyMask/modifyAlpha/PNG/JPEG, SSE2 SIMD kernels). Compared against the in-repo baseline in scripts/windows/screenshots.

Benchmark Results

Detailed Performance Metrics

Metric	Duration
SIMD kernel backend	SSE2 (x64) / NEON (arm64) native kernels
SIMD int-add (64K x300)	java 39ms / native 3ms = 13.0x speedup
SIMD float-mul (64K x300)	java 39ms / native 2ms = 19.5x speedup
SIMD kernel correctness	PASS (native result == scalar reference)
Base64 native bridge	unavailable (CN1 + SIMD + image benchmarks only)
Base64 payload size	8192 bytes
Base64 benchmark iterations	6000
Base64 SIMD byte path	gated to scalar (CPU autovectorizes scalar; explicit SIMD not beneficial here)
Base64 CN1 encode	54.000 ms
Base64 CN1 decode	62.000 ms
Base64 SIMD encode	71.000 ms
Base64 encode ratio (SIMD/CN1)	1.315x (31.5% slower)
Base64 SIMD decode	66.000 ms
Base64 decode ratio (SIMD/CN1)	1.065x (6.5% slower)
Image encode benchmark iterations	100
Image createMask (SIMD off)	6.000 ms
Image createMask (SIMD on)	3.000 ms
Image createMask ratio (SIMD on/off)	0.500x (50.0% faster)
Image applyMask (SIMD off)	24.000 ms
Image applyMask (SIMD on)	25.000 ms
Image applyMask ratio (SIMD on/off)	1.042x (4.2% slower)
Image modifyAlpha (SIMD off)	34.000 ms
Image modifyAlpha (SIMD on)	23.000 ms
Image modifyAlpha ratio (SIMD on/off)	0.676x (32.4% faster)
Image modifyAlpha removeColor (SIMD off)	26.000 ms
Image modifyAlpha removeColor (SIMD on)	24.000 ms
Image modifyAlpha removeColor ratio (SIMD on/off)	0.923x (7.7% faster)

ParparVM vs HotSpot (JDK 25): Windows x64

Runner CPU: Intel64 Family 6 Model 173 Stepping 1, GenuineIntel (baseline windows-x64@intel64-family-6-model-173-genuineintel)

Ratios are ParparVM / JDK 25: below 1.00x ParparVM is faster (time) or smaller (RAM). Median of 5 interleaved, paired rounds; every run's output was verified. A ratio more than 15% (time) / 15% (RAM) away from its baseline in vm/selfhost/perf-baseline/ fails: above it is a regression, below it an improvement that has to be rebaselined (a row whose calibration runs were noisier carries a wider tolerance), and for RAM the change must also exceed 0.05x in absolute terms. Both run unpinned on all of the runner's CPUs, with their own default thread counts.

Benchmark	Cores	Time	RAM	Status
hello (WinHelloMain)	4	1.21x (base 1.21x, -0.0%)	0.76x (base 0.69x, +9.5%)	ok
translator (self)	4	0.66x (base 0.68x, -1.8%)	0.56x (base 0.55x, +1.1%)	ok
intArithmetic	4	1.01x (base 1.01x, -0.1%)	0.05x (base 0.05x, -0.6%)	ok
longArithmetic	4	1.07x (base 1.07x, +0.3%)	0.05x (base 0.05x, -0.4%)	ok
mathTranscendental	4	0.89x (base 0.89x, -0.2%)	0.06x (base 0.06x, -0.7%)	ok
arraySequential	4	1.40x (base 1.35x, +3.7%)	0.38x (base 0.38x, +0.3%)	ok
arrayRandom	4	1.00x (base 1.00x, -0.1%)	0.23x (base 0.23x, -0.4%)	ok
objectAllocation	4	4.09x (base 4.10x, -0.2%)	0.44x (base 0.47x, -5.9%)	ok
valueEscape	4	0.13x (base 0.13x, -0.1%)	0.05x (base 0.05x, -1.1%)	ok
hashMapChurn	4	1.02x (base 1.00x, +2.3%)	0.11x (base 0.10x, +3.1%)	ok
stringBuilding	4	1.30x (base 1.25x, +4.5%)	0.26x (base 0.27x, -2.9%)	ok
recursion	4	1.24x (base 1.23x, +0.4%)	0.06x (base 0.06x, -0.1%)	ok
quicksort	4	1.07x (base 1.08x, -0.4%)	0.12x (base 0.12x, -0.7%)	ok

Result: no regression

shai-almog · 2026-10-02T03:48:20Z