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Update Helidon startup and memory numbers for the jlink image #352

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Merged
mraible merged 3 commits into from
Oct 28, 2026
Merged

Update Helidon startup and memory numbers for the jlink image #352

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d859385
Update Helidon startup times for the jlink image with AOT cache
mraible Oct 27, 2026
74b5c34
Update Helidon memory usage for the jlink image
mraible Oct 27, 2026
9972a6c
Clarify why Helidon's startup number isn't native
mraible Oct 28, 2026
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12 changes: 8 additions & 4 deletions reactive/demo.adoc
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Original file line number Diff line number Diff line change
Expand Up @@ -447,15 +447,15 @@ TIP: Use the link:start.sh[`start.sh`] script to get the real time, not what eac
Micronaut: same as imperative since there's no difference in code
Quarkus: (25 + 24 + 24 + 24 + 23) / 5 = 24
Spring Boot: (37 + 40 + 38 + 38 + 38) / 5 = 38.2
Helidon: (157 + 311 + 375 + 169 + 230) / 5 = 248.4
Helidon: (197 + 197 + 197 + 198 + 195) / 5 = 196.8
----
+
Printed duration:
+
----
Quarkus: (10 + 10 + 10 + 10 + 10) / 5 = 10
Spring Boot: (22 + 23 + 21 + 21 + 21) / 5 = 21.6
Helidon: (146 + 303 + 363 + 164 + 220) / 5 = 239.2
Helidon: (147 + 148 + 147 + 145 + 145) / 5 = 146.4
----

.Native Java startup times in milliseconds
Expand All @@ -465,9 +465,11 @@ Helidon: (146 + 303 + 363 + 164 + 220) / 5 = 239.2
|Micronaut | `./micronaut/build/native/nativeCompile/app` | 26
|Quarkus | `./quarkus/build/quarkus-1.0.0-SNAPSHOT-runner` | 24
|Spring Boot | `./spring-boot/build/native/nativeCompile/spring-boot` | 38.2
|Helidon | `./helidon/target/helidon` | 248.4
|Helidon | `./helidon/target/helidon-jri/bin/start` | 196.8
|===

Helidon 27 requires Java 27, but GraalVM releases are based on Java 25, so Helidon's number is for a jlink image with an AOT cache, not a native executable.

NOTE: These numbers are from an Apple M3 Max with 64 GB RAM.

== Memory Usage Comparison
Expand All @@ -488,9 +490,11 @@ Substitute `<executable>` as follows:
|Micronaut | `app` | 53 | 63 | 105
|Quarkus | `quarkus` | 39 | 50 | 55
|Spring Boot | `spring-boot` | 75 | 108 | 223
|Helidon | `helidon` | 51 | 52 | 70
|Helidon | `helidon-jri` | 99 | 169 | 493
|===

Helidon's numbers are for its jlink image, which runs on the JVM, so it uses more memory than the native executables. Each is the median of three runs of `memory.sh`.

----
./build.sh
./start.sh micronaut|quarkus|spring-boot|helidon
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