Ankur Mhatre
958b401f0f
Adds spring-boot-startup-time/, the companion project for BLOG-618: a runnable Spring Boot 4.1.1 application on JDK 25 that installs BufferingApplicationStartup and FlightRecorderApplicationStartup behind a system property, and a /diag/startup endpoint that computes step self time -- the number /actuator/startup does not give you and the one that names the actual culprits. Captured under docs/output/: the step tree sorted both ways, the same startup as JFR events, a +5000-class experiment putting 0.11 ms per scanned class on the classpath scan tax, the silent truncation a 2048-step buffer performs, and JDK 25 AOT cache timings (6.93 s to 4.82 s). Post body and metadata live in post/. Moves the existing Actuator project into actuator-in-production/ so the repository holds one directory per article; the root README is now an index.
39 lines
3.2 KiB
XML
39 lines
3.2 KiB
XML
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<svg viewBox="0 0 740 300" role="img" aria-label="Two rankings of the same four hundred startup steps. Sorted by total duration the top entries are spring.context.refresh at 5830 milliseconds and reportTemplateRegistry at 514 milliseconds. Sorted by self time those fall to 114 and 10 milliseconds respectively, and the real costs are the entity manager factory at 1414 milliseconds, configuration class parsing at 1015, and tariffCacheWarmer at 504." xmlns="http://www.w3.org/2000/svg">
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<style>
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.t{font:600 13px system-ui,sans-serif;fill:#2b3138}
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.h{font:600 11px system-ui,sans-serif;fill:#57606b}
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.m{font:11px ui-monospace,Menlo,monospace;fill:#2b3138}
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.c{font:11px system-ui,sans-serif;fill:#57606b}
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</style>
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<rect width="100%" height="100%" fill="#ffffff"/>
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<text class="t" x="12" y="18">Same 400 steps, sorted two ways</text>
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<text class="h" x="12" y="44">SORTED BY TOTAL DURATION — ranks containers</text>
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<rect x="12" y="52" width="330" height="22" fill="#f7d9d3" stroke="#c56a54"/>
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<text class="m" x="18" y="67">spring.context.refresh</text><text class="m" x="266" y="67">5829 ms</text>
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<rect x="12" y="78" width="112" height="22" fill="#fdeccf" stroke="#c9973f"/>
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<text class="m" x="18" y="93">&entityManagerFactory</text><text class="m" x="266" y="93">1804 ms</text>
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<rect x="12" y="104" width="40" height="22" fill="#f7d9d3" stroke="#c56a54"/>
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<text class="m" x="58" y="119">reportTemplateRegistry</text><text class="m" x="266" y="119">514 ms</text>
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<rect x="12" y="130" width="38" height="22" fill="#e7f4ea" stroke="#4a9d63"/>
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<text class="m" x="56" y="145">tariffCacheWarmer</text><text class="m" x="266" y="145">504 ms</text>
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<text class="h" x="392" y="44">SORTED BY SELF TIME — ranks culprits</text>
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<rect x="392" y="52" width="88" height="22" fill="#e7f4ea" stroke="#4a9d63"/>
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<text class="m" x="398" y="67">&entityManagerFactory</text><text class="m" x="646" y="67">1414 ms</text>
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<rect x="392" y="78" width="63" height="22" fill="#e7f4ea" stroke="#4a9d63"/>
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<text class="m" x="461" y="93">config-classes.parse</text><text class="m" x="646" y="93">1015 ms</text>
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<rect x="392" y="104" width="31" height="22" fill="#e7f4ea" stroke="#4a9d63"/>
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<text class="m" x="429" y="119">tariffCacheWarmer</text><text class="m" x="646" y="119">504 ms</text>
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<rect x="392" y="130" width="7" height="22" fill="#e8eefc" stroke="#5b7fc7" stroke-dasharray="3 3"/>
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<text class="m" x="405" y="145">spring.context.refresh</text><text class="m" x="646" y="145">114 ms</text>
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<rect x="392" y="156" width="1" height="22" fill="#e8eefc" stroke="#5b7fc7" stroke-dasharray="3 3"/>
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<text class="m" x="399" y="171">reportTemplateRegistry</text><text class="m" x="646" y="171">10 ms</text>
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<text class="c" x="12" y="212">reportTemplateRegistry looks like the fifth-worst bean in the application. It costs 10 ms.</text>
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<text class="c" x="12" y="230">The other 504 ms belong to tariffCacheWarmer, which it happens to depend on and therefore triggers first.</text>
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<text class="c" x="12" y="248">Whichever bean is constructed first in a dependency chain inherits the whole chain in the total column.</text>
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<text class="c" x="12" y="266">That is an artefact of construction order. It is not a cost.</text>
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</svg>
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